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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-24001) Don't cache MapWork in tez/ObjectCache during query-based compaction
Date Thu, 06 Aug 2020 15:10:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-24001?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ASF GitHub Bot updated HIVE-24001:
----------------------------------
    Labels: pull-request-available  (was: )

> Don't cache MapWork in tez/ObjectCache during query-based compaction
> --------------------------------------------------------------------
>
>                 Key: HIVE-24001
>                 URL: https://issues.apache.org/jira/browse/HIVE-24001
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Karen Coppage
>            Assignee: Karen Coppage
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Query-based major compaction can fail intermittently with the following issue:
> {code:java}
> Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: One writer is supposed to
handle only one bucket. We saw these 2 different buckets: 1 and 6
>   at org.apache.hadoop.hive.ql.udf.generic.GenericUDFValidateAcidSortOrder.evaluate(GenericUDFValidateAcidSortOrder.java:77)
> {code}
> This is consistently preceded in the application log with:
> {code:java}
>  [INFO] [TezChild] |tez.ObjectCache|: Found hive_20200804185133_f04cca69-fa30-4f1b-a5fe-80fc2d749f48_Map
1__MAP_PLAN__ in cache with value: org.apache.hadoop.hive.ql.plan.MapWork@74652101
> {code}
> Alternatively, when MapRecordProcessor doesn't find mapWork in tez/ObjectCache (but instead
caches mapWork), major compaction succeeds.
> The failure happens because, if MapWork is reused, GenericUDFValidateAcidSortOrder (which
is called during compaction) is also reused on splits belonging to two different buckets,
which produces an error.
> Solution is to avoid storing MapWork in the ObjectCache during query-based compaction.



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