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https://issues.apache.org/jira/browse/HBASE-5875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13266446#comment-13266446
]
chunhui shen commented on HBASE-5875:
-------------------------------------
@ram
I'm clear now about the time gap.
What about do the following check
{code}
if (assignmentManager.getRegionServerOfRegion(HRegionInfo.ROOT_REGIONINFO) ==
null) {
ServerName currentRootServer = null;
if (!catalogTracker.verifyRootRegionLocation(timeout)) {
currentRootServer = this.catalogTracker.getRootLocation();
splitLogAndExpireIfOnline(currentRootServer);
this.assignmentManager.assignRoot();
// Make sure a -ROOT- location is set.
if (!isRootLocation())
return false;
// This guarantees that the transition assigning -ROOT- has completed
this.assignmentManager.waitForAssignment(HRegionInfo.ROOT_REGIONINFO);
assigned++;
} else {
// Region already assigned. We didn't assign it. Add to in-memory state.
this.assignmentManager.regionOnline(HRegionInfo.ROOT_REGIONINFO,
this.catalogTracker.getRootLocation());
}
} else {
// Root region has been assigned through processRegionInTransition
}
{code}
> Process RIT and Master restart may remove an online server considering it as
> a dead server
> ------------------------------------------------------------------------------------------
>
> Key: HBASE-5875
> URL: https://issues.apache.org/jira/browse/HBASE-5875
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.92.1
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 0.94.1
>
> Attachments: HBASE-5875.patch
>
>
> If on master restart it finds the ROOT/META to be in RIT state, master tries
> to assign the ROOT region through ProcessRIT.
> Master will trigger the assignment and next will try to verify the Root
> Region Location.
> Root region location verification is done seeing if the RS has the region in
> its online list.
> If the master triggered assignment has not yet been completed in RS then the
> verify root region location will fail.
> Because it failed
> {code}
> splitLogAndExpireIfOnline(currentRootServer);
> {code}
> we do split log and also remove the server from online server list. Ideally
> here there is nothing to do in splitlog as no region server was restarted.
> So master, though the server is online, master just invalidates the region
> server.
> In a special case, if i have only one RS then my cluster will become non
> operative.
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