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https://issues.apache.org/jira/browse/HBASE-28354?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nick Dimiduk resolved HBASE-28354.
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Resolution: Fixed
Committed to branches 2.5+. Thanks for the contribution [~aalhour].
> RegionSizeCalculator throws NPE when regions are in transition
> --------------------------------------------------------------
>
> Key: HBASE-28354
> URL: https://issues.apache.org/jira/browse/HBASE-28354
> Project: HBase
> Issue Type: Bug
> Reporter: Bryan Beaudreault
> Assignee: Ahmad Alhour
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.6.0, 4.0.0-alpha-1, 3.0.0-beta-2, 2.5.8
>
>
> When a region is in transition, it may briefly have a null ServerName in
> meta. The RegionSizeCalculator calls RegionLocator.getAllRegionLocations()
> and does not handle the possibility that a RegionLocation.getServerName()
> could be null. The ServerName is eventually passed into an Admin call, which
> results in an NPE.
> This has come up in other contexts. For example, taking a look at
> getAllRegionLocations() impl, we have checks to ensure that we don't call
> null server names. We need to similarly handle the possibility of nulls in
> RegionSizeCalculator.
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