[
https://issues.apache.org/jira/browse/HIVE-21466?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16795707#comment-16795707
]
Hive QA commented on HIVE-21466:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12962897/HIVE-21466.1.patch
{color:red}ERROR:{color} -1 due to no test(s) being added or modified.
{color:red}ERROR:{color} -1 due to 8 failed/errored test(s), 15833 tests
executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestNegativeCliDriver.testCliDriver[udaf_invalid_place]
(batchId=99)
org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query28]
(batchId=275)
org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query44]
(batchId=275)
org.apache.hadoop.hive.cli.TestTezPerfCliDriver.testCliDriver[query8]
(batchId=275)
org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[mv_query44]
(batchId=275)
org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query28]
(batchId=275)
org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query44]
(batchId=275)
org.apache.hadoop.hive.cli.TestTezPerfConstraintsCliDriver.testCliDriver[query8]
(batchId=275)
{noformat}
Test results:
https://builds.apache.org/job/PreCommit-HIVE-Build/16566/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/16566/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-16566/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 8 tests failed
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12962897 - PreCommit-HIVE-Build
> Increase Default Size of SPLIT_MAXSIZE
> --------------------------------------
>
> Key: HIVE-21466
> URL: https://issues.apache.org/jira/browse/HIVE-21466
> Project: Hive
> Issue Type: Improvement
> Components: Configuration
> Affects Versions: 4.0.0, 3.2.0
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Minor
> Attachments: HIVE-21466.1.patch, HIVE-21466.1.patch
>
>
> {code:java}
> MAPREDMAXSPLITSIZE(FileInputFormat.SPLIT_MAXSIZE, 256000000L, "", true),
> {code}
> [https://github.com/apache/hive/blob/8d4300a02691777fc96f33861ed27e64fed72f2c/common/src/java/org/apache/hadoop/hive/conf/HiveConf.java#L682]
> This field specifies a maximum size for each MR (maybe other?) splits.
> This number should be a multiple of the HDFS Block size. The way that this
> maximum is implemented, is that each block is added to the split, and if the
> split grows to be larger than the maximum allowed, the split is submitted to
> the cluster and a new split is opened.
> So, imagine the following scenario:
> * HDFS block size of 16 bytes
> * Maximum size of 40 bytes
> This will produce a split with 3 blocks. (2x16) = 32; another block will be
> inserted, (3x16) = 48 bytes in the split. So, while many operators would
> assume a split of 2 blocks, the actual is 3 blocks. Setting the maximum split
> size to a multiple of the HDFS block size will make this behavior less
> confusing.
> The current setting is ~256MB and when this was introduced, the default HDFS
> block size was 64MB. That is a factor of 4x. However, now HDFS block sizes
> are 128MB by default, so I propose setting this to 4x128MB. The larger
> splits (fewer tasks) should give a nice performance boost for modern hardware.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
