[jira] [Updated] (HBASE-9048) HCM throws NullPointerException under load

["Jimmy Xiang (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-9048?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jimmy Xiang updated HBASE-9048:
-------------------------------

    Attachment: 0.94-9048.patch
    
> 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
>         Attachments: 0.94-9048.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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