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From "Alan Gates (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-8258) Compactor cleaners can be starved on a busy table or partition.
Date Fri, 03 Oct 2014 23:27:33 GMT

     [ https://issues.apache.org/jira/browse/HIVE-8258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Alan Gates updated HIVE-8258:
-----------------------------
    Attachment: HIVE-8258.3.patch

Attaching a version of the patch with fixed unit tests.

> 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
>         Attachments: HIVE-8258.2.patch, HIVE-8258.3.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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