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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-3243) Disable Table closed region on wrong host
Date Wed, 17 Nov 2010 10:53:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-3243?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12932894#action_12932894
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Jonathan Gray commented on HBASE-3243:
--------------------------------------

Dug into code around compareTo() and the values instance.  Pretty sure we are not touching
that while a cluster is running, and definitely not during disabling.  We've actually even
taken the 'offline' flag out of META as well, it's a node in ZK now that signals the state
of a table (enabling/disabling/disabled).

It is interesting that HRI comparator uses the full HTD comparator.  It should probably just
use the tableName itself to compare though considering HTD is a member it might make sense
in some circumstances to do the full HTD.compareTo()?

Looking around the code, it does look like there are multiple places we're using regions w/o
a lock in the disable table path.  Pretty sure this is the cause.  Patch soon.

> Disable Table closed region on wrong host
> -----------------------------------------
>
>                 Key: HBASE-3243
>                 URL: https://issues.apache.org/jira/browse/HBASE-3243
>             Project: HBase
>          Issue Type: Bug
>          Components: master
>    Affects Versions: 0.90.0
>            Reporter: Todd Lipcon
>            Priority: Blocker
>             Fix For: 0.90.0
>
>
> I ran some YCSB benchmarks which resulted in about 150 regions worth of data overnight.
Then I disabled the table, and the master for some reason closed one region on the wrong server.
The server ignored this, but the region remained open on a different server, which later flipped
out when it tried to flush due to hlog accumulation.

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