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https://issues.apache.org/jira/browse/HBASE-6289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404280#comment-13404280
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Zhihong Ted Yu commented on HBASE-6289:
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The reason Hadoop QA didn't post back is the following:
{code}
[ERROR]
/Users/zhihyu/trunk-hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/catalog/CatalogTracker.java:[346,38]
unreported exception java.lang.InterruptedException; must be caught or
declared to be thrown
[ERROR]
[ERROR]
/Users/zhihyu/trunk-hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/catalog/CatalogTracker.java:[380,34]
unreported exception java.lang.InterruptedException; must be caught or
declared to be thrown
[ERROR]
[ERROR]
/Users/zhihyu/trunk-hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/catalog/CatalogTracker.java:[419,6]
exception java.lang.InterruptedException is never thrown in body of
corresponding try statement
[ERROR]
[ERROR]
/Users/zhihyu/trunk-hbase/hbase-server/src/main/java/org/apache/hadoop/hbase/catalog/CatalogTracker.java:[693,35]
unreported exception java.lang.InterruptedException; must be caught or
declared to be thrown
{code}
> 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
> Assignee: 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.
> {code}
> 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();
> }
> }
> {code}
> 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:
> {code}
> 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
> {code}
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