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https://issues.apache.org/jira/browse/HBASE-1852?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12758294#action_12758294
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stack commented on HBASE-1852:
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I'm trying the patch now. It looks good. Cosmin, what you think of Jon's test?
> 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: 0.20.1
>
> 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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