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Hadoop QA commented on HBASE-5849: ---------------------------------- -1 overall. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12523905/5849v3.txt against trunk revision . +1 @author. The patch does not contain any @author tags. +1 tests included. The patch appears to include 3 new or modified tests. -1 patch. The patch command could not apply the patch. Console output: https://builds.apache.org/job/PreCommit-HBASE-Build/1622//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: 5849v3.txt, 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. -- This message is automatically generated by JIRA. If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa For more information on JIRA, see: http://www.atlassian.com/software/jira