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https://issues.apache.org/jira/browse/HBASE-4300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13094025#comment-13094025
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Todd Lipcon commented on HBASE-4300:
------------------------------------
We should move everything stored in ZK into protobufs, or at least add a
version number to them.
> Start of new-version master fails if old master's znode is hanging around
> -------------------------------------------------------------------------
>
> Key: HBASE-4300
> URL: https://issues.apache.org/jira/browse/HBASE-4300
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Priority: Critical
> Fix For: 0.92.0
>
>
> I shut down an 0.90 cluster, and had to do so uncleanly. I then started a
> trunk (0.92) cluster before the old master znode had expired. This cased:
> java.lang.StringIndexOutOfBoundsException: String index out of range: -1
> at java.lang.String.substring(String.java:1937)
> at
> org.apache.hadoop.hbase.ServerName.parseHostname(ServerName.java:81)
> at org.apache.hadoop.hbase.ServerName.<init>(ServerName.java:63)
> at
> org.apache.hadoop.hbase.master.ActiveMasterManager.blockUntilBecomingActiveMaster(ActiveMasterManager.java:148)
> at
> org.apache.hadoop.hbase.master.HMaster.becomeActiveMaster(HMaster.java:342)
> at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:297)
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