SAS Viya

11月 212017
 

SAS Viya provides a robust, scalable, cloud-ready, distributed runtime engine. This engine is driven by CAS (Cloud Analytic Services), providing fast processing for many data management techniques that run distributive, i.e. using all threads on all defined compute nodes.

Why

PROC APPEND is a common technique used in SAS processes. This technique will concatenate two data sets together. However, PROC APPEND will produce an ERROR if the target CAS table exists prior to the PROC APPEND.

Simulating PROC APPEND

Figure 1. SAS Log with the PROC APPEND ERROR message

Now what?

How

To explain how to simulate PROC APPEND we first need to create two CAS tables. The first CAS table is named CASUSER.APPEND_TARGET. Notice the variables table, row and variable in figure 2.

Figure 2. Creating the CAS table we need to append rows to

The second CAS table is called CASUSER.TABLE_TWO and in figure 3 we can review the variables table, row, and variable.

Figure 3. Creating the table with the rows that we need to append to the existing CAS table

To simulate PROC APPEND we will use a DATA Step. Notice on line 77 in figure 4 we will overwrite an existing CAS table, i.e. CASUSER.APEND_TARGET. On Line 78, we see the first table on the SET statement is CASUSER.APPEND_TARGET, followed by CASUSER.TABLE_TWO. When this DATA Step runs, all of the rows in CASUSER.APPEND_TARGET will be processed first, followed by the rows in CASUSER.TABLE_TWO. Also, note we are not limited to two tables on the SET statement with DATA Step; we can use as many as we need to solve our business problems.

Figure 4. SAS log validating the DATA Step ran in CAS i.e. distributed

The result table created by the DATA Step is shown in figure 5.

Figure 5. Result table from simulating PROC APPEND using a DATA Step

Conclusion

SAS Viya’s CAS processing allows us to stage data for downstream consumption by leveraging robust SAS programming techniques that run distributed, i.e. fast. PROC APPEND is a common procedure used in SAS processes. To simulate PROC APPEND when using CAS tables as source and target tables to the procedure use DATA Step.

How to simulate PROC APPEND in CAS was published on SAS Users.

11月 202017
 

Many SAS users have inquired about SAS Cloud Analytic Services’ (CAS) Distributed Network File System (Learn more about CAS.)

The “NFS” in “DNFS”

Let’s start at the beginning. The “NFS” in DNFS stands for “Network File System” and refers to the ability to share files across a network. As the picture below illustrates, a network file system lets numerous remote hosts access another host’s files.

Understanding DNFS

NFS

There are numerous network file system protocols that can be used for file sharing – e.g. CIFS, Ceph, Lustre – but the most common on Linux is NFS. While NFS is the dominant file-sharing protocol, the “NFS” part of the DNFS does not correspond to the NFS protocol. Currently all the DNFS supported file systems are based on NFS, but DNFS may support file systems based on other protocols in the future. So, it’s best to think of the “NFS” part of “DNFS” as a generic “network file system” (clustered file system) and not the specific NFS protocol.

The “D” in “DNFS”

The “D” in DNFS stands for “Distributed” but it does not refer to the network file system. By definition, that is already distributed since the file system is external to the machines accessing it. The “Distributed” in DNFS refers to CAS’ ability to use a network file system in a massively parallel way. With a supported file system mounted identically on each CAS node, CAS can access (both write) the file system’s CSV and SASHDAT files from every worker node in parallel.

This parallel file access is not an attribute of the file system, it is a capability of CAS. By definition, network file systems facilitate access at the file level, not the block level. With DNFS, CAS actively manages parallel block level I/O to the network file system, making sure file seek locations and block I/O operations do not overlap, etc.

DNFS

 

DNFS as CAS Backing Store

Not only can CAS perform multi-machine parallel I/O from network file systems, it can also memory-map NFS SASHDAT files directly into CAS. Thus, SASHDAT files on DNFS act as both the CASlib data source as well as the virtual memory “backing store,” often negating the need for CAS to utilize memory mapping (mmap()).

Note 1: Data transformations on load, such as row filtering and field selection, as well as encryption can trigger CAS_DISK_CACHE usage. Since the data must be transformed (subset and/or decrypted), CAS copies the transformed data into CAS_DISK_CACHE to support CAS processing.

Note 2: It is possible to use DNFS atop an encrypting file system or hardware storage device. Here, the HDAT blocks are stored encrypted but transmitted to the CAS I/O layer decrypted. Assuming no other transformations, CAS_DISK_CACHE will not be used in this scenario.

DNFS Memory Mapping

Performance Considerations

DNFS-based CAS loading will only be as fast as the slowest component involved. The chosen NFS architecture (hardware and CAS connectivity) should support I/O throughput commensurate with the CAS installation and in-line with the implementation’s service level agreements. So, while NetApp ONTAP clustering architecture. A different file system technology might look a little different but the same basic ideas will apply.

DNFS w/ Multi Machine File System

As described earlier, CAS manages the parallel I/O operations. Requests from CAS are sent to the appliance and handled by the NFS metadata server. The storage device implementing the NFS protocol points CAS DNFS to the proper file and block locations on the NFS data servers which pass the data to the CAS worker nodes directly.

Understanding DNFS was published on SAS Users.

11月 162017
 

As a SAS Viya user, you may be wondering whether it is possible to execute data append and data update concurrently to a global Cloud Analytic Services (CAS) table from two or more CAS sessions. (Learn more about CAS.) How would this impact the report view while data append or data update is running on a global CAS table? These questions are even more important for those using the programming interface to load and update data in CAS. This post discusses data append, data update, and concurrency in CAS.

Two or more CAS sessions can simultaneously submit a data append and data update process to a CAS table, but only one process at a time can run against the same CAS table. The multiple append and update processes execute in serial, one after another, never running in a concurrent fashion. Whichever CAS session is first to acquire the write lock on a global CAS table prevails, appending or updating the data first. The other append and update processes must wait in a queue to acquire the write lock.

During the data append process, the appended data is not available to end users or reports until all rows are inserted and committed into the CAS table. While data append is running, users can still render reports against the CAS table using the original data, but excluding the appended rows.

Similarly, during the data update process, the updated data is not available to users or reports until the update process is complete. However, CAS lets you render reports using the original (non-updated) data, as the CAS table is always available for the read process. During the data update process, CAS makes additional copies into memory of the to-be-updated blocks containing rows in order to perform the update statement. Once the update process is complete, the additional and now obsolete copies of blocks, are removed from CAS. Data updates to a global CAS table is an expensive operation in terms of CPU and memory usage. You have to factor in the additional overhead memory or CAS_CACHE space to support the updates. The space requirement depends on the number of rows being affected by the update process.

At any given time, there could be only one active write process (append/update) against a global CAS table. However, there could be many concurrent active read processes against a global CAS table. A global CAS table is always available for read processes, even when an append or update process is running on the same CAS table.

The following log example describes two simultaneous CAS sessions executing data appends to a CAS table. Both append processes were submitted to CAS with a gap of a few seconds. Notice the execution time for the second CAS session MYSESSION1 is double the time that it took the first CAS session to append the same size of data to the CAS table. This shows that both appends were executing one after another. The amount of memory used and the CAS_CACHE location also shows that both processes were running one after another in a serial fashion.

Log from simultaneous CAS session MYSESSION submitting APPEND

58 proc casutil ;
NOTE: The UUID '1411b6f2-e678-f546-b284-42b6907260e9' is connected using session MYSESSION.
59 load data=mydata.big_prdsale
60 outcaslib="caspath" casout="big_PRDSALE" append ;
NOTE: MYDATA.BIG_PRDSALE was successfully added to the "caspath" caslib as "big_PRDSALE".
61 quit ;
NOTE: PROCEDURE CASUTIL used (Total process time):
real time 49.58 seconds
cpu time 5.05 seconds

Log from simultaneous CAS session MYSESSION1 submitting APPEND

58 proc casutil ;
NOTE: The UUID 'a20a246e-e0cc-da4d-8691-c0ff2a222dfd' is connected using session MYSESSION1.
59 load data=mydata.big_prdsale1
60 outcaslib="caspath" casout="big_PRDSALE" append ;
NOTE: MYDATA.BIG_PRDSALE1 was successfully added to the "caspath" caslib as "big_PRDSALE".
61 quit ;
NOTE: PROCEDURE CASUTIL used (Total process time):
real time 1:30.33
cpu time 4.91 seconds

 

When the data append process from MYSESSION1 was submitted alone (no simultaneous process), the execution time is around the same as for the first session MYSESSION. This also shows that when two simultaneous append processes were submitted against the CAS table, one was waiting for the other to finish. At one time, only one process was running the data APPEND action to the CAS table (no concurrent append).

Log from a lone CAS session MYSESSION1 submitting APPEND

58 proc casutil ;
NOTE: The UUID 'a20a246e-e0cc-da4d-8691-c0ff2a222dfd' is connected using session MYSESSION1.
59 load data=mydata.big_prdsale1
60 outcaslib="caspath" casout="big_PRDSALE" append ;
NOTE: MYDATA.BIG_PRDSALE1 was successfully added to the "caspath" caslib as "big_PRDSALE".
61 quit ;
NOTE: PROCEDURE CASUTIL used (Total process time):
real time 47.63 seconds
cpu time 4.94 seconds

 

The following log example describes two simultaneous CAS sessions submitting data updates on a CAS table. Both update processes were submitted to CAS in a span of a few seconds. Notice the execution time for the second CAS session MYSESSION1 is double the time it took the first session to update the same number of rows. The amount of memory used and the CAS_CACHE location also shows that both processes were running one after another in a serial fashion. While the update process was running, memory and CAS_CACHE space increased, which suggests that the update process makes copies of to-be-updated data rows/blocks. Once the update process is complete, the space usage in memory/CAS_CACHE returned to normal.

When the data UPDATE action from MYSESSION1 was submitted alone (no simultaneous process), the execution time is around the same as for the first CAS session.

Log from a simultaneous CAS session MYSESSION submitting UPDATE

58 proc cas ;
59 table.update /
60 set={
61 {var="actual",value="22222"},
62 {var="country",value="'FRANCE'"}
63 },
64 table={
65 caslib="caspath",
66 name="big_prdsale",
67 where="index in(10,20,30,40,50,60,70,80,90,100 )"
68 }
69 ;
70 quit ;
NOTE: Active Session now MYSESSION.
{tableName=BIG_PRDSALE,rowsUpdated=86400}
NOTE: PROCEDURE CAS used (Total process time):
real time 4:37.68
cpu time 0.05 seconds

 

Log from a simultaneous CAS session MYSESSION1 submitting UPDATE

57 proc cas ;
58 table.update /
59 set={
60 {var="actual",value="22222"},
61 {var="country",value="'FRANCE'"}
62 },
63 table={
64 caslib="caspath",
65 name="big_prdsale",
66 where="index in(110,120,130,140,150,160,170,180,190,1100 )"
67 }
68 ;
69 quit ;
NOTE: Active Session now MYSESSION1.
{tableName=BIG_PRDSALE,rowsUpdated=86400}
NOTE: PROCEDURE CAS used (Total process time):
real time 8:56.38
cpu time 0.09 seconds

 

The following memory usage snapshot from one of the CAS nodes describes the usage of memory before and during the CAS table update. Notice the values for “used” and “buff/cache” columns before and during the CAS table update.

Memory usage on a CAS node before starting a CAS table UPDATE

Memory usage on a CAS node during CAS table UDPATE

Summary

When simultaneous data append and data update requests are submitted against a global CAS table from two or more CAS sessions, they execute in a serial fashion (no concurrent process execution). To execute data updates on a CAS table, you need an additional overhead memory/CAS_CACHE space. While the CAS table is going through the data append or data update process, the CAS table is still accessible to rendering reports.

Concurrent data append and update to a global CAS table was published on SAS Users.

10月 272017
 

When loading data into CAS using PROC CASUTIL, you have two choices on how the table can be loaded:  session-scope or global-scope.  This is controlled by the PROMOTE option in the PROC CASUTIL statement.

Session-scope loaded

proc casutil;
                                load casdata="model_table.sas7bdat" incaslib="ryloll" 
                                outcaslib="otcaslib" casout="model_table”;
run;
Global-scope loaded
proc casutil;
                                load casdata="model_table.sas7bdat" incaslib="ryloll" 
                                outcaslib="otcaslib" casout="model_table" promote;
run;

 

Global-scope loaded

proc casutil;
                                load casdata="model_table.sas7bdat" incaslib="ryloll" 
                                outcaslib="otcaslib" casout="model_table" promote;
run;

 

Remember session-scope tables can only be seen by a single CAS session and are dropped from CAS when that session is terminated, while global-scope tables can be seen publicly and will not be dropped when the CAS session is terminated.

But what happens if I want to create a new table for modeling by partitioning an existing table and adding a new partition column? Will the new table be session-scoped or global-scoped? To find out, I have a global-scoped table called MODEL_TABLE that I want to partition based on my response variable Event. I will use PROC PARTITION and call my new table MODEL_TABLE_PARTITIONED.

proc partition data=OTCASLIB.MODEL_TABLE partind samppct=30;
	by Event;
	output out=OTCASLIB.model_table_partitioned;
run;

 

After I created my new table, I executed the following code to determine its scope. Notice that the Promoted Table value is set to No on my new table MODEL_TABLE_PARTITIONED which means it’s session-scoped.

proc casutil;
     list tables incaslib="otcaslib";
run;

 

promote CAS tables from session-scope to global-scope

How can I promote my table to global-scoped?  Because PROC PARTITION doesn’t provide me with an option to promote my table to global-scope, I need to execute the following PROC CASUTIL code to promote my table to global-scope.

proc casutil;
     promote casdata="MODEL_TABLE_PARTITIONED"
     Incaslib="OTCASLIB" Outcaslib="OTCASLIB" CASOUT="MODEL_TABLE_PARTITIONED";
run;

 

I know what you’re thinking.  Why do I have to execute a PROC CASUTIL every time I need my output to be seen publicly in CAS?  That’s not efficient.  There has to be a better way!

Well there is, by using CAS Actions.  Remember, when working with CAS in SAS Viya, SAS PROCs are converted to CAS Actions and CAS Actions are at a more granular level, providing more options and parameters to work with.

How do I figure out what CAS Action syntax was used when I execute a SAS PROC?  Using the PROC PARTITION example from earlier, I can execute the following code after my PROC PARTITION completes to see the CAS Action syntax that was previously executed.

proc cas;
     history;
run;

 

This command will return a lot of output, but if I look for lines that start with the word “action,” I can find the CAS Actions that were executed.  In the output, I can see the following CAS action was executed for PROC PARTITION:

action sampling.stratified / table={name='MODEL_TABLE', caslib='OTCASLIB', groupBy={{name='Event'}}}, samppct=30, partind=true, output={casOut={name='MODEL_TABLE_PARTITIONED', caslib='OTCASLIB', replace=true}, copyVars='ALL'};

 

To partition my MODEL_TABLE using a CAS Action, I would execute the following code.

proc cas;
  sampling.stratified / 
    table={name='MODEL_TABLE', caslib='OTCASLIB', groupBy={name='Event'}}, 
    samppct=30, 
    partind=true, 
    output={casOut={name='embu_partitioned', caslib='OTCASLIB'}, copyVars='ALL'};
run;

 

If I look up sampling.stratified syntax in the

proc cas;
  sampling.stratified / 
    table={name='MODEL_TABLE', caslib='OTCASLIB', groupBy={name='Event'}}, 
    samppct=30, 
    partind=true, 
    output={casOut={name='embu_partitioned', caslib='OTCASLIB', promote=true}, copyVars='ALL'};
run;

 

So, what did we learn from this exercise?  We learned that when we create a table in CAS from a SAS PROC, the default scope will be session and to change the scope to global we would need to promote it through a PROC CASUTIL statement.  We also learned how to see the CAS Actions that were executed by SAS PROCs and how we can write code in CAS Action form to give us more control.

I hope this exercise helps you when working with CAS.

Thanks.

Tip and tricks to promote CAS tables from session-scope to global-scope was published on SAS Users.

10月 212017
 

Advantages of SAS ViyaThere are many compelling reasons existing SAS users might want to start integrating SAS Viya into their SAS9 programs and applications.  For me, it comes down to ease-of-use, speed, and faster time-to-value.  With the ability to traverse the (necessarily iterative) analytics lifecycle faster than before, we are now able to generate output quicker – better supporting vital decision-making in a reduced timeframe.   In addition to the positive impacts this can have on productivity, it can also change the way we look at current business challenges and how we design possible solutions.

Earlier this year I wrote about how SAS Viya provides a robust analytics environment to handle all of your big data processing needs.  Since then, I’ve been involved in testing the new SAS Viya 3.3 software that will be released near the end of 2017 and found some additional advantages I think warrant attention.  In this article, I rank order the main advantages of SAS Viya processing and new capabilities coming to SAS Viya 3.3 products.  While the new SAS Viya feature list is too long to list everything individually, I’ve put together the top reasons why you might want to start taking advantage of SAS Viya capabilities of the SAS platform.

1.     Multi-threaded everything, including the venerable DATA-step

In SAS Viya, everything that can run multi-threaded - does.  This is the single-most important aspect of the SAS Viya architecture for existing SAS customers.  As part of this new holistic approach to data processing, SAS has enabled the highly flexible DATA step to run multi-threaded, requiring very little modification of code in order to begin taking advantage of this significant new capability (more on that in soon-to-be-released blog).  Migrating to SAS Viya is important especially in those cases where long-running jobs consist of very long DATA steps that act as processing bottle-necks where constraints exist because of older single-threading configurations.

2.     No sorting necessary!

While not 100% true, most sort routines can be removed from your existing SAS programs.  Ask yourself the question: “What portion of my runtimes are due strictly to sorting?”  The answer is likely around 10-25%, maybe more.  In general, the concept of sorting goes away with in-memory processing.  SAS Viya does its own internal memory shuffling as a replacement.  The SAS Viya CAS engine takes care of partitioning and organizing the data so you don’t have to.  So, take those sorts out your existing code!

3.     VARCHAR informat (plus other “variable-blocking” informats/formats)

Not available in SAS 9.4, the VARCHAR informat/format allows you to store byte information without having to allocate room for blank spaces.  Because storage for columnar (input) values varies by row, you have the potential to achieve an enormous amount of (blank space) savings, which is especially important if you are using expensive (fast) disk storage space.  This represents a huge value in terms of potential data storage size reduction.

4.     Reduced I/O in the form of data reads and writes from Hive/HDFS and Teradata to CAS memory

SAS Viya can leverage Hive/HDFS and Teradata platforms by loading (lifting) data up and writing data back down in parallel using CAS pooled memory.  Data I/O, namely reading data from disk and converting it into a SAS binary format needed for processing, is the single most limiting factor of SAS 9.4.  Once you speed up your data loading, especially for extremely large data sets, you will be able to generate faster time to results for all analyses and projects.

5.     Persisted data can stay in memory to support multiple users or processing steps

Similar to SAS LASR, CAS can be structured to persist large data sets in memory, indefinitely.  This allows users to access the same data at the same time and eliminates redundancy and repetitive I/O, potentially saving valuable compute cycles.  Essentially, you can load the data once and then as many people (or processing steps) can reuse it as many times as needed thereafter.

6.     State-of-the-art Machine Learning (ML) techniques (including Gradient Boosting, Random Forest, Support Vector Machines, Factorization Machines, Deep Learning and NLP analytics)

All the most popular ML techniques are represented giving you the flexibility to customize model tournaments to include those techniques most appropriate for your given data and problem set.  We also provide assessment capabilities, thus saving you valuable time to get the types of information you need to make valid model comparisons (like ROC charts, lift charts, etc.) and pick your champion models.  We do not have extreme Gradient Boosting, Factorization Machines, or a specific Assessment procedure in SAS 9.4.  Also, GPU processing is supported in SAS Viya 3.3, for Deep Neural Networks and Convolutional Neural Networks (this has not be available previously).

7.     In-memory TRANSPOSE

The task of transposing data amounts to about 80% of any model building exercise, since predictive analytics requires a specialized data set called a ‘one-row-per-subject’ Analytic Base Table (ABT).  SAS Viya allows you transpose in a fraction of the time that it used to take to develop the critical ABT outputs.  A phenomenal time-saver procedure that now runs entirely multi-threaded, in-memory.

8.     API’s!!!

The ability to code from external interfaces gives coders the flexibility they need in today’s fast-moving programming world.  SAS Viya supports native language bindings for Lua, Java, Python and R.  This means, for example, that you can launch SAS processes from a Jupyter Notebook while staying within a Python coding environment.  SAS also provide a REST API for use in data science and IT departments.

9.     Improved model build and deployment options

The core of SAS  Viya machine learning techniques support auto-tuning.  SAS has the most effective hyper-parameter search and optimization routines, allowing data scientists to arrive at the correct algorithm settings with higher probability and speed, giving them better answers with less effort.  And because ML scoring code output is significantly more complex, SAS Viya Data Mining and Machine Learning allows you to deploy compact binary score files (called Astore files) into databases to help facilitate scoring.  These binary files do not require compilation and can be pushed to ESP-supported edge analytics.  Additionally, training within  event streams is being examined for a future release.

10.    Tons of new SAS visual interface advantages

A.     Less coding – SAS Viya acts as a code generator, producing batch code for repeatability and score code for easier deployment.  Both batch code and score code can be produced in a variety of formats, including SAS, Java, and Python.

B.     Improved data integration between SAS Viya visual analytics products – you can now edit your data in-memory and pass it effortlessly through to reporting, modeling, text, and forecasting applications (new tabs in a single application interface).

C.     Ability to compare modeling pipelines – now data scientists can compare champion models from any number of pipelines (think of SAS9 EM projects or data flows) they’ve created.

D.     Best practices and white box templates – once only available as part of SAS 9 Rapid Predictive Modeler, Model Studio now gives you easy access to basic, intermediate and advanced model templates.

E.     Reusable components – Users can save their best work (including pipelines and individual nodes) and share it with others.  Collaborating is easier than ever.

11.    Data flexibility

You can load big data without having all that data fit into memory.  Before in HPA or LASR engines, the memory environment had to be sized exactly to fit all the data.  That prior requirement has been removed using CAS technology – a really nice feature.

12.    Overall consolidation and consistency

SAS Viya seeks to standardize on common algorithms and techniques provided within every analytic technique so that you don’t get different answers when attempting to do things using alternate procedures or methods. For instance, our deployment of Stochastic Gradient Descent is now the same in every technique that uses that method.  Consistency also applies to the interfaces, as SAS Viya attempts to standardize the look-and-feel of various interfaces to reduce your learning curve when using a new capability.

The net result of these Top 12 advantages is that you have access to state-of-the-art technology, jobs finish faster, and you ultimately get faster time-to-value.  While this idea has been articulated in some of the above points, it is important to re-emphasize because SAS Viya benefits, when added together, result in higher throughputs of work, a greater flexibility in terms of options, and the ability to keep running when other systems would have failed.  You just have a much greater efficiency/productivity level when using SAS Viya as compared to before.  So why not use it?

Learn more about SAS Viya.
Tutorial Library: An introduction to SAS Viya programming for SAS 9 programmers.
Blog: Adding SAS Viya to your SAS 9 programming toolbox.

Top 12 Advantages of SAS Viya was published on SAS Users.

10月 192017
 

The goal of this article is to describe the steps needed to configure the bridge that allows SAS Data Integration 4.902, based on SAS 9.4M4, to load data directly into CAS on SAS Viya 3.2.

Of course, SAS 9.4M5 simplifies this process, as a SAS/CONNECT communication will no longer be required, enabled by a direct function within SAS Data Integration to CAS - but for those of you who may not move immediately from SAS 9.4M4 to SAS 9.4M5, this could be helpful.

It is assumed here that SAS/CONNECT has been installed and configured on both environments, SAS 9.4M4 and SAS Viya 3.2.

Validate the connection from SAS 9.4M4 to SAS Viya 3.2

⇒     Check the status of the SAS/CONNECT Spawner on SAS Viya, on the machine where this service is installed.

SAS Viya 3.2 Bridge for SAS Data Integration Studio

⇒     Note the machine and the listening port of the SAS/CONNECT Spawner on SAS Viya.
⇒     Open SAS Studio on SAS 9.4M4 and sign-in.
⇒     Run the following SAS code with your machine details and a valid SAS Viya user account and check the results.

SAS Viya 3.2 Bridge for SAS Data Integration Studio

⇒     If successful, sign-off the SAS/CONNECT session and sign-out from SAS Studio SAS 9.4M4

Setup SAS9.4M4 metadata

⇒     Open SAS Management Console 9.4M4 as sasadm@saspw.
⇒     On the “Server Manager” plugin, add a “New Server…”

  • Server type: “SAS Application Server”
  • Name: “SASViya”
  • Select “Connect Server” as the sub-type of server you want to add to this SAS Application Server
  • Configure the “Connect Server” as shown below (you might have to create a new authentication domain for SAS Viya) and set the values accordingly (server where the SAS/CONNECT Spawner on SAS Viya is listening)

⇒     On the “Server Manager” plugin, add a “New Server…”

  • Server type: “SAS Cloud Analytic Services Server”
  • Name: “CAS Server”
  • Configure the “CAS Server” as shown below and set the values accordingly (CAS controller)

⇒     On the “User Manager” plugin, set a login for the SASViya application server, on a user or group that you will use in SAS Data Integration Studio

⇒     On the “Data Library Manager” plugin, add a “New Library…”

  • Library type: “SAS Cloud Analytic Services Library”
  • Name: CAS_DATA
  • Assign the library to the SASViya server

⇒     Configure the CAS library as shown below and set the values accordingly (the CASLIB must exist in the SAS Viya environment; here CASPATH is the name of an existing CASLIB).

⇒     Specify the server and connection information as shown below:

Build a SAS Data Integration Studio job to load data into CAS

⇒     Open SAS Data Integration Studio 4.902 as a user who holds, directly or not, a login for the ViyaAuth authentication domain.
⇒     Test the CAS_DATA library by “Register(ing) tables…”

  • In SAS Environment Manager on SAS Viya, some tables must have been loaded before into the CASLIB (the one that is pointed on by the CAS library, here CASPATH), so that you can display some tables in the “Register Tables…” wizard.
  • If you see some tables then it looks like you are all set.

⇒     If you want to go further and test the “Cloud Analytic Services Transfer” DI transformation, create the metadata for a target table in CAS with appropriate columns.

⇒     Build a job that loads a source table to this target table using the “Cloud Analytic Services Transfer” (“Access” folder) as shown below:

⇒     The “Cloud Analytic Services Transfer” is basically a “Data Transfer” transformation that fits with CAS; it enables you to provide some CAS options such as COPIES; by default the table is PROMOTED.

⇒     Run it and check if it ran successfully and if the table is available from the SAS Viya world.

SAS/CONNECT on SAS Viya configuration directory

⇒     The SAS/CONNECT on SAS Viya configuration is located by default here /opt/sas/viya/config/etc/connectserver/default

⇒     You might want to customize/clean some of the files here.

  • Check the CASHOST option in autoexec files, sometimes the value is not appropriate.

Normally, options here are sourced from the CONNECTSERVER_CONFIGURATION in vars.yml during the deployment of SAS Viya.

SAS Viya 3.2 Bridge for SAS Data Integration Studio 4.902 (on SAS 9.4M4) configuration steps was published on SAS Users.

10月 172017
 

moving content between SAS Viya environmentsIn a SAS Viya 3.2 environment two types of content can be created: SAS Visual Analytics Reports and Data Plans. For administrators, who may want to manage that content within a folder structure, there are some things to keep in mind. In the current release, both types of content can be moved around in folders, but the objects cannot be copied. In addition, SAS Viya 3.2 supports the promotion of SAS Visual Analytics Reports, but doesn’t support the promotion of Data Plans (support for Plans is coming in SAS Viya 3.3). So, what if I want to copy a report between, say my personal folders, to a production folder?

If you want copy a Report or Data Plan within an environment there is an easy way. When the object is open in edit mode you can do a Save As to save a copy to a different location in the folder structure.

Between environments, Reports can be exported and imported using the SAS Visual Analytics, when you are editing your content (Report or Data Plan) you can access a “diagnostics” window. The diagnostics window will show you the json (or xml) used to render the Report or Plan. To enter the diagnostics window use the keystrokes:

  • ctl+alt+d for SAS Visual Data Builder.
  • ctl+alt+b for SAS Visual Analytics.

In the steps below I will use the diagnostics window to save a Data Plan so that it can be loaded to a different SAS Viya Environment. The steps for a SAS Visual Analytics report are very similar.

In SAS Visual Data Builder when editing your Data Plan select ctl-alt-d to open the SAS Visual Data Builder Diagnostics window. The source tab of the window shows the json that will render the data plan.

Click Save to save the json to a text file and close the dialog. The json file will be saved in the browsers default downloads folder.

Copy the saved text file to a location accessible to the SAS Viya environment where you want to import the plan. In that environment, open Data Builder and click New to open a new Data Plan.

Click ctl-alt-d on the empty data plan and cut and paste the json from your text file replacing the json in the diagnostics window.

Click Parse to check the json.A message should be displayed indicating that the  “plan text was parsed successfully.”  Once you have parsed the text, click Run and the plan is loaded into SAS Visual Data Builder.

In SAS Visual Data Builder, select Save As and save the plan to any location in the folder structure.

The assumption with this approach is that the data is available in the same location in both environments.

You can do much the same with SAS Visual Analytics reports. The key-stroke is ctl-alt-b to open the SAS Visual Analytics Diagnostics window.  You can see the report xml or json on the BIRD tab.

To copy a single report between environments, you can select json and then save the json to a file. In the target environment open a new report, paste the json in the BIRD tab, parse and load and then save the report to a folder. This can be a useful approach if you want to relocate a report to a different location in your target environment. The transfer service currently will only import reports to the same folder location in the target that they are located in the source environment.

I hope you found this tip useful.

A tip for moving content between SAS Viya environments was published on SAS Users.

9月 282017
 

SAS Viya: What’s in it for me?If you’re in the field of analytics, you’ve undoubtedly heard about SAS Viya, our new, open analytic platform. Designed for all analytic professionals, regardless of skills or experience, SAS Viya seamlessly handles big, complex, diverse data and can bridge SAS 9.4. It also provides a tool that supports any programming language, allowing analysts to choose the tool that makes them most productive.

Recently a colleague of mine, Leo Sadovy, wrote the blog post SAS Viya: What’s in it for me? The business? This post describes the benefits of SAS Viya for the line of business owner. Spoiler alert: When it comes to analytics, SAS Viya provides the best of all worlds.

But what does SAS Viya mean to me … if I’m a current SAS user? As the communication manager for our existing SAS user base, Leo’s post inspired me to ask a similar question on behalf of our SAS users.

So, I hit the road, found a few smart colleagues (who know a lot more than I do about SAS Viya!) and recorded the Facebook Live video you’ll find attached below.

You’ll learn what SAS Viya is and what motivated us to create it, what it means to you as a SAS user (a new or longtime one), and what learning tools and other resources are available to you to learn even more.

Enjoy!

SAS Viya: What's in it for me? The user

Learn more about SAS Viya

And, if you have any other questions about SAS Viya, feel free to leave them in the comments field. I’ll get back to if I have the answer… or find someone else who can help, if I don't!

SAS Viya: What’s in it for me? The user. was published on SAS Users.

9月 112017
 

If you’ve got SAS running within your organization, which is likely considering that over 90 percent of the largest global firms have SAS, you’ve probably been hearing a lot about SAS® Viya™, the latest modernization of the SAS platform. But amidst all the talk about microservices and actions, procedures and [...]

SAS Viya: What’s in it for me, the business? was published on SAS Voices by Leo Sadovy

8月 182017
 

SAS Viya deployments use credentials for accessing databases and other third-party products that require authentication. In this blog post, I will look at how this sharing of credentials is implemented in SAS Environment Manager.

In SAS Viya, domains are used to store the:

  • Credentials required to access external data sources.
  • Identities that are allowed to use those credentials.

There are three types of domains:

  • Authentication stores credentials that are used to access an external source that can then be associated with a caslib.
  • Connection used when the external database has been set up to require a User ID but no password.
  • Encryption stores an encryption key required to read data at rest in a path assigned to a caslib.

In this blog post we will focus on authentication domains which are typically used to provide access to data in a database management system. It is a pretty simple concept; an authentication domain makes a set of credentials available to a set of users. This allows SAS Viya to seamlessly access a resource. The diagram below shows a logical view of a domain. In this example, the domain PGAuth stores the credentials for a Postgres database, and makes those credentials available to two groups (and their members) and three users.

How does this work when a user accesses data in a database caslib? The following steps are performed:

1.     Log on to SAS Viya using personal credentials: the user’s identity is established including group memberships.

2.     Access a CASLIB for a database: using the user’s identity and the authentication domain of the CASLIB, Viya will look up the credentials associated with that identity in the domain.

3.     Two results are possible. A credential match is:

  • 1.     Found: the credentials are passed to the database authentication provider to determine access to the data.
  • 2.     Not found: no access to the data is provided.

To manage domains in SAS Environment Manager you must be an administrator. In SAS Environment Manager select Security > Domains. There are two views available:  Domains and Credentials. The Domains view lists all defined domains. You can access the credentials for a domain by right-clicking on the domain and selecting Credentials.

The Credentials view lists all credentials defined and the domains for which they are associated.

Whatever way you get to a credential, you can edit it by right-clicking and selecting Edit. In the edit dialog, you can specify the Identities (users and groups) that can use the credential, and the User ID and Password of the credential.  Note that only users who are already listed in the Identities field will be able to edit this field, so make sure you are in this field (directly or through group membership) prior to saving.

To use an authentication domain, you reference it in the CASLIB definition. When defining a non-path based CASLIB you must select a domain to provide user credentials to connect to the database server. This can be done when creating a new CASLIB in SAS Environment Manager in the Data > Libraries area.

If you use code to create or access your caslib, use the authenticationdomain option. In this example, we specify authenticationdomain in the table.addcaslib action.

If a user is not attached to the authentication domain directly, or through a group membership, they will not be able to access the credentials. An error will occur when they attempt to access the data.

This has been a brief look at storing and using credentials to access databases from SAS Viya. You can find  more detail in the SAS Viya Administration Guide in the section titled SAS Viya sharing credentials for database access was published on SAS Users.