[jira] [Commented] (HIVE-7593) Instantiate SparkClient per user session [Spark Branch]

["Hive QA (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-7593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104308#comment-14104308 ] 

Hive QA commented on HIVE-7593:
-------------------------------



{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12662806/HIVE-7593.1-spark.patch

{color:red}ERROR:{color} -1 due to 4 failed/errored test(s), 5958 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_sample_islocalmode_hook
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_dynpart_sort_opt_vectorization
org.apache.hadoop.hive.cli.TestNegativeCliDriver.testNegativeCliDriver_fs_default_name2
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_union_null
{noformat}

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-SPARK-Build/67/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-SPARK-Build/67/console
Test logs: http://ec2-54-176-176-199.us-west-1.compute.amazonaws.com/logs/PreCommit-HIVE-SPARK-Build-67/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 4 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12662806

> Instantiate SparkClient per user session [Spark Branch]
> -------------------------------------------------------
>
>                 Key: HIVE-7593
>                 URL: https://issues.apache.org/jira/browse/HIVE-7593
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Spark
>            Reporter: Xuefu Zhang
>            Assignee: Chinna Rao Lalam
>         Attachments: HIVE-7593-spark.patch, HIVE-7593.1-spark.patch
>
>
> SparkContext is the main class via which Hive talk to Spark cluster. SparkClient encapsulates a SparkContext instance. Currently all user sessions share a single SparkClient instance in HiveServer2. While this is good enough for a POC, even for our first two milestones, this is not desirable for a multi-tenancy environment and gives least flexibility to Hive users. Here is what we propose:
> 1. Have a SparkClient instance per user session. The SparkClient instance is created when user executes its first query in the session. It will get destroyed when user session ends.
> 2. The SparkClient is instantiated based on the spark configurations that are available to the user, including those defined at the global level and those overwritten by the user (thru set command, for instance).
> 3. Ideally, when user changes any spark configuration during the session, the old SparkClient instance should be destroyed and a new one based on the new configurations is created. This may turn out to be a little hard, and thus it's a "nice-to-have". If not implemented, we need to document that subsequent configuration changes will not take effect in the current session.
> Please note that there is a thread-safety issue on Spark side where multiple SparkContext instances cannot coexist in the same JVM (SPARK-2243). We need to work with Spark community to get this addressed.
> Besides above functional requirements, avoid potential issues is also a consideration. For instance, sharing SC among users is bad, as resources (such as jar for UDF) will be also shared, which is problematic. On the other hand, one SC per job seems too expensive, as the resource needs to be re-rendered even there isn't any change.



--
This message was sent by Atlassian JIRA
(v6.2#6252)