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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14201) hbck should not take a lock unless fixing errors
Date Wed, 12 Aug 2015 21:45:45 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14201?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14694225#comment-14694225
] 

Hudson commented on HBASE-14201:
--------------------------------

FAILURE: Integrated in HBase-TRUNK #6719 (See [https://builds.apache.org/job/HBase-TRUNK/6719/])
HBASE-14201 hbck should not take a lock unless fixing errors (eclark: rev 0c63d415d9d23a80ec3b8f454bbf4748de4a1a78)
* hbase-server/src/test/java/org/apache/hadoop/hbase/util/hbck/HbckTestingUtil.java
* hbase-server/src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsck.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java


> hbck should not take a lock unless fixing errors
> ------------------------------------------------
>
>                 Key: HBASE-14201
>                 URL: https://issues.apache.org/jira/browse/HBASE-14201
>             Project: HBase
>          Issue Type: Bug
>          Components: hbck, util
>    Affects Versions: 2.0.0, 1.3.0
>            Reporter: Simon Law
>            Assignee: Simon Law
>             Fix For: 2.0.0, 1.2.0
>
>         Attachments: HBASE-14201-v0.patch, HBASE-14201-v1.patch
>
>
> By default, hbck is run in a read-only checker mode. In this case, it is
> sensible to let others run. By default, the balancer is left alone,
> which may cause spurious errors, but cannot leave the balancer in a bad
> state. It is dangerous to leave the balancer by accident, so it is only
> ever enabled after fixing, it will never be forced off because of
> racing.
> When hbck is run in fixer mode, it must take an exclusive lock and
> disable the balancer, or all havoc will break loose.
> If you want to stop hbck from running in parallel, the -exclusive flag
> will create the lock file. If you want to force -disableBalancer, that
> option is available too. This makes more semantic sense than -noLock and
> -noSwitchBalancer, respectively.
> This task is related to HBASE-14092.



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