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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-8258) Compactor cleaners can be starved on a busy table or partition.
Date Tue, 14 Oct 2014 03:54:34 GMT

    [ https://issues.apache.org/jira/browse/HIVE-8258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14170480#comment-14170480
] 

Lefty Leverenz commented on HIVE-8258:
--------------------------------------

Doc note:  This adds configuration parameter *hive.compactor.cleaner.run.interval* to HiveConf.java,
so it needs to be documented in the wiki:

* [Hive Transactions -- Configuration | https://cwiki.apache.org/confluence/display/Hive/Hive+Transactions#HiveTransactions-Configuration]
* maybe also [Hive Transactions -- Configuration Values to Set for Compaction | https://cwiki.apache.org/confluence/display/Hive/Hive+Transactions#HiveTransactions-ConfigurationValuestoSetforCompaction]
* [Configuration Properties -- Transactions and Compactor | https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-TransactionsandCompactor]

> Compactor cleaners can be starved on a busy table or partition.
> ---------------------------------------------------------------
>
>                 Key: HIVE-8258
>                 URL: https://issues.apache.org/jira/browse/HIVE-8258
>             Project: Hive
>          Issue Type: Bug
>          Components: Transactions
>    Affects Versions: 0.13.1
>            Reporter: Alan Gates
>            Assignee: Alan Gates
>            Priority: Critical
>             Fix For: 0.14.0
>
>         Attachments: HIVE-8258.2.patch, HIVE-8258.3.patch, HIVE-8258.4.patch, HIVE-8258.5.patch,
HIVE-8258.6.patch, HIVE-8258.patch
>
>
> Currently the cleaning thread in the compactor does not run on a table or partition while
any locks are held on this partition.  This leaves it open to starvation in the case of a
busy table or partition.  It only needs to wait until all locks on the table/partition at
the time of the compaction have expired.  Any jobs initiated after that (and thus any locks
obtained) will be for the new versions of the files.



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