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https://issues.apache.org/jira/browse/HBASE-4402?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13121610#comment-13121610
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Todd Lipcon commented on HBASE-4402:
------------------------------------
Your fix looks good. I didn't think about the fact that there might be nulls
due to regions that were added while the server was offline, or if a table was
disabled when shutdown, but ZK was wiped before the cluster was brought back up.
> Retaining locality after restart broken
> ---------------------------------------
>
> Key: HBASE-4402
> URL: https://issues.apache.org/jira/browse/HBASE-4402
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.92.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Priority: Blocker
> Fix For: 0.92.0
>
> Attachments: hbase-4402.txt, hbase-4402.txt
>
>
> In DefaultLoadBalancer, we implement the "retain assignment" function like so:
> {code}
> if (sn != null && servers.contains(sn)) {
> assignments.get(sn).add(region.getKey());
> {code}
> but this will never work since after a cluster restart, all servers have a
> new ServerName with a new startcode.
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