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https://issues.apache.org/jira/browse/HBASE-9048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jimmy Xiang updated HBASE-9048:
-------------------------------
Resolution: Fixed
Hadoop Flags: Reviewed
Status: Resolved (was: Patch Available)
Thanks Stack for reviewing it. Integrated into trunk, 0.95, and 0.94.
> HCM throws NullPointerException under load
> ------------------------------------------
>
> Key: HBASE-9048
> URL: https://issues.apache.org/jira/browse/HBASE-9048
> Project: HBase
> Issue Type: Bug
> Components: Client
> Reporter: Jimmy Xiang
> Assignee: Jimmy Xiang
> Priority: Minor
> Fix For: 0.98.0, 0.95.2, 0.94.11
>
> Attachments: 0.94-9048.patch, trunk-9048.patch
>
>
> HCM uses SoftValueSortedMap to cache region locations. Under load, some soft
> referred values may be GCed. So we should check if the value is null.
> Otherwise, NPE will be thrown:
> {code}
> for (Map<byte[], HRegionLocation> tableLocations :
> cachedRegionLocations.values()) {
> for (Entry<byte[], HRegionLocation> e : tableLocations.entrySet()) {
> ===> if (serverName.equals(e.getValue().getServerName())) {
> tableLocations.remove(e.getKey());
> deletedSomething = true;
> }
> }
> }
> {code}
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