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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6326) Avoid nested retry loops in HConnectionManager
Date Wed, 11 Jul 2012 02:38:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13411173#comment-13411173

Hudson commented on HBASE-6326:

Integrated in HBase-0.94-security #39 (See [https://builds.apache.org/job/HBase-0.94-security/39/])
    HBASE-6326 Avoid nested retry loops in HConnectionManager (Revision 1357752)

     Result = SUCCESS
larsh : 
Files : 
* /hbase/branches/0.94/src/main/java/org/apache/hadoop/hbase/client/HConnectionManager.java

> Avoid nested retry loops in HConnectionManager
> ----------------------------------------------
>                 Key: HBASE-6326
>                 URL: https://issues.apache.org/jira/browse/HBASE-6326
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>            Priority: Critical
>             Fix For: 0.96.0, 0.94.1
>         Attachments: 6326-trunk.txt, 6326.txt
> While testing client timeouts when the HBase is not available we found that even with
aggressive settings, it takes the client 10 minutes or more to finally receive an exception.
> Part of this is due to nested nested retry loops in locateRegion.
> locateRegion will first try to locate the table in meta (which is retried), then it will
try to locate the meta table is root (which is also retried).
> So for each retry of the meta lookup we retry the root lookup as well.
> I have have that avoids locateRegion retrying if it is called from code that already
has a retry loop.

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