Enis Soztutar created HBASE-5849: ------------------------------------ Summary: 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
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