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https://issues.apache.org/jira/browse/HBASE-1157?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12667570#action_12667570
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Jim Kellerman commented on HBASE-1157:
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As 0.19.x does not allow a server with the same ip:port number to join the
cluster until the previous instance has been recovered, this is not an issue
for 0.19.x. However, if we intend to allow a new instance of the same server to
start serving regions, we need to be able to differentiate between the dead
instance and the new one.
This is my primary reason for making the startcode a part of the regionserver
identification.
While we might use a different mechanism after ZK integration, the ZK
integration still needs to account for what instance
of the regionserver it is dealing with.
> If we do not take start code as a part of region server recovery, we could
> inadvertantly try to reassign regions assigned to a restarted server with a
> different start code
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-1157
> URL: https://issues.apache.org/jira/browse/HBASE-1157
> Project: Hadoop HBase
> Issue Type: Bug
> Components: master, regionserver
> Affects Versions: 0.20.0
> Reporter: Jim Kellerman
> Assignee: Jim Kellerman
> Fix For: 0.20.0
>
>
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