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Posted to issues@hbase.apache.org by "Maryann Xue (JIRA)" <ji...@apache.org> on 2012/06/28 13:03:44 UTC
[jira] [Updated] (HBASE-6289) ROOT region doesn't get re-assigned
in ServerShutdownHandler if the RS is still working but only the RS's ZK
node expires.
[ https://issues.apache.org/jira/browse/HBASE-6289?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Maryann Xue updated HBASE-6289:
-------------------------------
Attachment: HBASE-6289.patch
Add "excluded" server in verifyRootRegionLocation().
> ROOT region doesn't get re-assigned in ServerShutdownHandler if the RS is still working but only the RS's ZK node expires.
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-6289
> URL: https://issues.apache.org/jira/browse/HBASE-6289
> Project: HBase
> Issue Type: Bug
> Components: master
> Affects Versions: 0.90.6, 0.94.0
> Reporter: Maryann Xue
> Priority: Critical
> Attachments: HBASE-6289.patch
>
>
> The ROOT RS has some network problem and its ZK node expires first, which kicks off the ServerShutdownHandler. it calls verifyAndAssignRoot() to try to re-assign ROOT. At that time, the RS is actually still working and passes the verifyRootRegionLocation() check, so the ROOT region is skipped from re-assignment.
> private void verifyAndAssignRoot()
> throws InterruptedException, IOException, KeeperException {
> long timeout = this.server.getConfiguration().
> getLong("hbase.catalog.verification.timeout", 1000);
> if (!this.server.getCatalogTracker().verifyRootRegionLocation(timeout)) {
> this.services.getAssignmentManager().assignRoot();
> }
> }
> After a few moments, this RS encounters DFS write problem and decides to abort. The RS then soon gets restarted from commandline, and constantly report:
> 2012-06-27 23:13:08,627 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: NotServingRegionException; Region is not online: -ROOT-,,0
> 2012-06-27 23:13:08,627 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: NotServingRegionException; Region is not online: -ROOT-,,0
> 2012-06-27 23:13:08,628 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: NotServingRegionException; Region is not online: -ROOT-,,0
> 2012-06-27 23:13:08,628 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: NotServingRegionException; Region is not online: -ROOT-,,0
> 2012-06-27 23:13:08,630 DEBUG org.apache.hadoop.hbase.regionserver.HRegionServer: NotServingRegionException; Region is not online: -ROOT-,,0
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