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https://issues.apache.org/jira/browse/HBASE-6920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467873#comment-13467873
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Gregory Chanan commented on HBASE-6920:
---------------------------------------
Some other points:
* I have not tried the client app that failed in the description with a patched
client yet. I will do that soon.
* This seems like a pretty serious issue (I literally could not get my app to
work with a 94 client), though it's not clear how often users will see it,
since it only happens on errors. It's also not new with 0.94.2 so I don't know
if it needs to sink the RC. Any opinions?
> On timeout connecting to master, client can get stuck and never make progress
> -----------------------------------------------------------------------------
>
> Key: HBASE-6920
> URL: https://issues.apache.org/jira/browse/HBASE-6920
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.94.2
> Reporter: Gregory Chanan
> Assignee: Gregory Chanan
> Priority: Critical
> Attachments: HBASE-6920.patch
>
>
> HBASE-5058 appears to have introduced an issue where a timeout in
> HConnection.getMaster() can cause the client to never be able to connect to
> the master. So, for example, an HBaseAdmin object can never successfully be
> initialized.
> The issue is here:
> {code}
> if (tryMaster.isMasterRunning()) {
> this.master = tryMaster;
> this.masterLock.notifyAll();
> break;
> }
> {code}
> If isMasterRunning times out, it throws an UndeclaredThrowableException,
> which is already not ideal, because it can be returned to the application.
> But if the first call to getMaster succeeds, it will set masterChecked =
> true, which makes us never try to reconnect; that is, we will set this.master
> = null and just throw MasterNotRunningExceptions, without even trying to
> connect.
> I tried out a 94 client (actually a 92 client with some 94 patches) on a
> cluster with some network issues, and it would constantly get stuck as
> described above.
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