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From "stack (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4308) Race between RegionOpenedHandler and AssignmentManager
Date Wed, 23 Nov 2011 09:27:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4308?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13155762#comment-13155762

stack commented on HBASE-4308:

Is this check the wrong way round Ram?

+    if (!openedNodeDeleted) {
+      if (this.assignmentManager.getZKTable().isDisablingOrDisabledTable(
+          regionInfo.getTableNameAsString())) {
+        debugLog(regionInfo, "Opened region "
+            + regionInfo.getRegionNameAsString() + " but "
+            + "this table is disabled, triggering close of region");
+        assignmentManager.unassign(regionInfo);
+      }

If we failed to delete the znode, only then you check if disabled?  Won't openedNodeDeleted
be true if all goes well and this is when you want to check if region is of a disabling table?

It looks like in old code that we checked table disabling whether we succeeded znode delete
or not?

Otherwise, I'm +1 on this patch (You can do fixup if I'm right and go ahead and commit)

> Race between RegionOpenedHandler and AssignmentManager
> ------------------------------------------------------
>                 Key: HBASE-4308
>                 URL: https://issues.apache.org/jira/browse/HBASE-4308
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.0
>            Reporter: Todd Lipcon
>            Assignee: ramkrishna.s.vasudevan
>             Fix For: 0.92.0
>         Attachments: HBASE-4308.patch, HBASE-4308_1.patch, HBASE-4308_2.patch
> When the master is processing a ZK event for REGION_OPENED, it calls delete() on the
znode before it removes the node from RegionsInTransition. If the notification of that delete
comes back into AssignmentManager before the region is removed from RIT, you see an error
> 2011-08-30 17:43:29,537 WARN  [main-EventThread] master.AssignmentManager(861): Node
deleted but still in RIT: .META.,,1.1028785192 state=OPEN, ts=1314751409532, server=todd-w510,55655,1314751396840
> Not certain if it causes issues, but it's a concerning log message.

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