[
https://issues.apache.org/jira/browse/HBASE-11405?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14141925#comment-14141925
]
Sean Busbey commented on HBASE-11405:
-------------------------------------
okay, the test failure is caused because on [hadoop 1 dfs client transparently
retries the file create for up to 5
minutes|https://github.com/apache/hadoop/blob/release-1.2.1/src/hdfs/org/apache/hadoop/hdfs/DFSClient.java#L163].
Looking at the logs of the hadoop 1 run, I can see the second hbck instance
fail to create the file. Then later after the first one cleans up, the second
picks up again and keeps going. Thus both succeed and the assert fails. Same
failure on 0.94.
I'd rather not insert a 5 minute sleep in the hbck to ensure the second
instance fails. Anyone have some idea of a different way we can test for the
branches that support hadoop 1?
> Multiple invocations of hbck in parallel disables balancer permanently
> -----------------------------------------------------------------------
>
> Key: HBASE-11405
> URL: https://issues.apache.org/jira/browse/HBASE-11405
> Project: HBase
> Issue Type: Bug
> Components: Balancer, hbck
> Affects Versions: 0.99.0
> Reporter: bharath v
> Assignee: bharath v
> Fix For: 2.0.0, 0.98.7, 0.94.24, 0.99.1
>
> Attachments: 11405-1.0.txt, 11405-v3.txt, 11405-v5.patch,
> 11405-v6.patch, 11405v7.patch, HBASE-11405-trunk-rebased.patch,
> HBASE-11405-trunk.patch, HBASE-11405-trunk.patch.1,
> hbase-11405.rebase.140911.patch
>
>
> This is because of the following piece of code in hbck
> {code:borderStyle=solid}
> boolean oldBalancer = admin.setBalancerRunning(false, true);
> try {
> onlineConsistencyRepair();
> }
> finally {
> admin.setBalancerRunning(oldBalancer, false);
> }
> {code}
> Newer invocations set oldBalancer to false as it was disabled by previous
> invocations and this disables balancer permanently unless its manually turned
> on by the user. Easy to reproduce, just run hbck 100 times in a loop in 2
> different sessions and you can see that balancer is set to false in the
> HMaster logs.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
