[jira] [Commented] (HIVE-6455) Scalable dynamic partitioning and bucketing optimization

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

    [ https://issues.apache.org/jira/browse/HIVE-6455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917227#comment-13917227 ] 

Hive QA commented on HIVE-6455:
-------------------------------



{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/12631856/HIVE-6455.9.patch

{color:red}ERROR:{color} -1 due to 10 failed/errored test(s), 5187 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_combine2_hadoop20
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_load_dyn_part15
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_merge4
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_sample10
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_auto_sortmerge_join_16
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_root_dir_external_table
org.apache.hadoop.hive.ql.parse.TestParse.testParse_input1
org.apache.hadoop.hive.ql.parse.TestParse.testParse_sample2
org.apache.hadoop.hive.ql.parse.TestParse.testParse_union
org.apache.hive.service.cli.TestEmbeddedThriftBinaryCLIService.testExecuteStatementAsync
{noformat}

Test results: http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/1574/testReport
Console output: http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/1574/console

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: 10 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12631856

> Scalable dynamic partitioning and bucketing optimization
> --------------------------------------------------------
>
>                 Key: HIVE-6455
>                 URL: https://issues.apache.org/jira/browse/HIVE-6455
>             Project: Hive
>          Issue Type: New Feature
>          Components: Query Processor
>    Affects Versions: 0.13.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>              Labels: optimization
>         Attachments: HIVE-6455.1.patch, HIVE-6455.1.patch, HIVE-6455.10.patch, HIVE-6455.2.patch, HIVE-6455.3.patch, HIVE-6455.4.patch, HIVE-6455.4.patch, HIVE-6455.5.patch, HIVE-6455.6.patch, HIVE-6455.7.patch, HIVE-6455.8.patch, HIVE-6455.9.patch, HIVE-6455.9.patch
>
>
> The current implementation of dynamic partition works by keeping at least one record writer open per dynamic partition directory. In case of bucketing there can be multispray file writers which further adds up to the number of open record writers. The record writers of column oriented file format (like ORC, RCFile etc.) keeps some sort of in-memory buffers (value buffer or compression buffers) open all the time to buffer up the rows and compress them before flushing it to disk. Since these buffers are maintained per column basis the amount of constant memory that will required at runtime increases as the number of partitions and number of columns per partition increases. This often leads to OutOfMemory (OOM) exception in mappers or reducers depending on the number of open record writers. Users often tune the JVM heapsize (runtime memory) to get over such OOM issues. 
> With this optimization, the dynamic partition columns and bucketing columns (in case of bucketed tables) are sorted before being fed to the reducers. Since the partitioning and bucketing columns are sorted, each reducers can keep only one record writer open at any time thereby reducing the memory pressure on the reducers. This optimization is highly scalable as the number of partition and number of columns per partition increases at the cost of sorting the columns.



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