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
