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From "Cosmin Lehene (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1852) HConnectionManager.testTableOnlineState will get into infinite loop if more than one .META. region
Date Wed, 07 Apr 2010 15:44:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12854558#action_12854558
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Cosmin Lehene commented on HBASE-1852:
--------------------------------------

I was also talking about 0.21. I don't think we'd need it too soon - you need a lot of data
to pass over a single region in .META.
It's just that someone might press the split button once... :) 

> HConnectionManager.testTableOnlineState will get into infinite loop if more than one
.META. region
> --------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1852
>                 URL: https://issues.apache.org/jira/browse/HBASE-1852
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.20.0
>         Environment: OSX/Linux
>            Reporter: Cosmin Lehene
>             Fix For: 0.21.0
>
>         Attachments: 0001-Fixed-.META.-split-bug-v2.patch, 0001-Fixed-.META.-split-bug.patch,
HBASE-1852-unittest1.patch, HBaseMetaSplitIssues.java
>
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> Create 3 tables (preferably on a clean cluster to avoid other potential issues)
> Split .META.
> From the master web inteface try to click on the first table - the page will not load
and refreshing the main page will show lots of requests. 
> HBaseAdmin.testTableOnlineState will get into an infinite loop if .META. has more than
one region. This method should probably use a regular scanner and an iterator. 
> I guess this issue would also happen with a single .META. region if rrs = getRegionServerWithRetries(s)
would get an UnknownScannerException (from a scanner lease expiration on the region server),
but I haven't double checked this.
> I attached a java method that you can use as a reference to reproduce the behavior. However,
since it calls split() on .META. and that is async, you might have to run it twice and check
that .META. actually splitted before getting into the infinite loop. 

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