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https://issues.apache.org/jira/browse/HBASE-5849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13260086#comment-13260086
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Hadoop QA commented on HBASE-5849:
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-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12523888/HBASE-5849_v2.patch
against trunk revision .
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 2 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
-1 findbugs. The patch appears to introduce 3 new Findbugs (version 1.3.9)
warnings.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
+1 core tests. The patch passed unit tests in .
Test results:
https://builds.apache.org/job/PreCommit-HBASE-Build/1620//testReport/
Findbugs warnings:
https://builds.apache.org/job/PreCommit-HBASE-Build/1620//artifact/trunk/patchprocess/newPatchFindbugsWarnings.html
Console output:
https://builds.apache.org/job/PreCommit-HBASE-Build/1620//console
This message is automatically generated.
> On first cluster startup, RS aborts if root znode is not available
> ------------------------------------------------------------------
>
> Key: HBASE-5849
> URL: https://issues.apache.org/jira/browse/HBASE-5849
> Project: HBase
> Issue Type: Bug
> Components: master, regionserver, zookeeper
> Affects Versions: 0.92.2, 0.96.0, 0.94.1
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Attachments: HBASE-5849_v1.patch, HBASE-5849_v2.patch
>
>
> When launching a fresh new cluster, the master has to be started first, which
> might create race conditions for starting master and rs at the same time.
> Master startup code is smt like this:
> - establish zk connection
> - create root znodes in zk (/hbase)
> - create ephemeral node for master /hbase/master,
> Region server start up code is smt like this:
> - establish zk connection
> - check whether the root znode (/hbase) is there. If not, shutdown.
> - wait for the master to create znodes /hbase/master
> So, the problem is on the very first launch of the cluster, RS aborts to
> start since /hbase znode might not have been created yet (only the master
> creates it if needed). Since /hbase/ is not deleted on cluster shutdown, on
> subsequent cluster starts, it does not matter which order the servers are
> started. So this affects only first launchs.
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