[jira] [Commented] (HIVE-7121) Use murmur hash to distribute HiveKey

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

    [ https://issues.apache.org/jira/browse/HIVE-7121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14008306#comment-14008306 ] 

Hive QA commented on HIVE-7121:
-------------------------------



{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/12646646/HIVE-7121.1.patch

{color:red}ERROR:{color} -1 due to 15 failed/errored test(s), 5462 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_parquet_decimal1
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_bucket5
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_bucket_num_reducers
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_infer_bucket_sort_bucketed_table
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_infer_bucket_sort_dyn_part
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_infer_bucket_sort_num_buckets
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_quotedid_smb
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_root_dir_external_table
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_truncate_column_buckets
org.apache.hadoop.hive.metastore.TestRemoteHiveMetaStore.testDropTable
org.apache.hadoop.hive.metastore.TestRemoteHiveMetaStore.testListPartitions
org.apache.hadoop.hive.metastore.TestRemoteHiveMetaStore.testNameMethods
org.apache.hive.hcatalog.pig.TestOrcHCatPigStorer.testWriteDecimal
org.apache.hive.hcatalog.pig.TestOrcHCatPigStorer.testWriteDecimalX
org.apache.hive.hcatalog.pig.TestOrcHCatPigStorer.testWriteDecimalXY
{noformat}

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-Build/288/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-Build/288/console
Test logs: http://ec2-174-129-184-35.compute-1.amazonaws.com/logs/PreCommit-HIVE-Build-288/

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: 15 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12646646

> Use murmur hash to distribute HiveKey
> -------------------------------------
>
>                 Key: HIVE-7121
>                 URL: https://issues.apache.org/jira/browse/HIVE-7121
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Gopal V
>            Assignee: Gopal V
>         Attachments: HIVE-7121.1.patch, HIVE-7121.WIP.patch
>
>
> The current hashCode implementation produces poor parallelism when dealing with single integers or doubles.
> And for partitioned inserts into a 1 bucket table, there is a significant hotspot on Reducer #31.
> Removing the magic number 31 and using a more normal hash algorithm would help fix these hotspots.



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