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From "Gregory Chanan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6920) On timeout connecting to master, client can get stuck and never make progress
Date Tue, 02 Oct 2012 17:15:07 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6920?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13467873#comment-13467873
] 

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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