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From "Elliott Clark (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-14201) hbck should not take a lock unless fixing errors
Date Tue, 11 Aug 2015 19:01:46 GMT

     [ https://issues.apache.org/jira/browse/HBASE-14201?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Elliott Clark updated HBASE-14201:
----------------------------------
         Assignee: Simon Law
    Fix Version/s:     (was: 1.2.0)
           Status: Patch Available  (was: Open)

> 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, 1.3.0
>
>         Attachments: HBASE-14201-v0.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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