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https://issues.apache.org/jira/browse/HBASE-5873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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rajeshbabu updated HBASE-5873:
------------------------------
Status: Patch Available (was: Open)
Attached patch.Please review and provide your comments/suggestions.
> TimeOut Monitor thread should be started after atleast one region server
> registers.
> -----------------------------------------------------------------------------------
>
> Key: HBASE-5873
> URL: https://issues.apache.org/jira/browse/HBASE-5873
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.6
> Reporter: ramkrishna.s.vasudevan
> Priority: Minor
> Fix For: 0.90.7, 0.92.2, 0.94.0, 0.96.0
>
> Attachments: HBASE-5873.patch
>
>
> Currently timeout monitor thread is started even before the region server has
> registered with the master.
> In timeout monitor we depend on the region server to be online
> {code}
> boolean allRSsOffline = this.serverManager.getOnlineServersList().
> isEmpty();
> {code}
> Now when the master starts up it sees there are no online servers and hence
> sets
> allRSsOffline to true.
> {code}
> setAllRegionServersOffline(allRSsOffline);
> {code}
> So this.allRegionServersOffline is also true.
> By this time an RS has come up,
> Now timeout comes up again (after 10secs) in the next cycle he sees
> allRSsOffline as false.
> Hence
> {code}
> else if (this.allRegionServersOffline && !allRSsOffline) {
> // if some RSs just came back online, we can start the
> // the assignment right away
> actOnTimeOut(regionState);
> {code}
> This condition makes him to take action based on timeout.
> Because of this even if one Region assignment of ROOT is going on, this piece
> of code triggers another assignment and thus we get RegionAlreadyinTransition
> Exception. Later we need to wait for 30 mins for assigning ROOT itself.
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