[jira] [Updated] (HBASE-8353) -ROOT-/.META. regions are hanging if master restarted while closing -ROOT-/.META. regions on dead RS

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-8353?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated HBASE-8353:
---------------------------------

    Fix Version/s:     (was: 0.94.11)
                   0.94.12

So this has been open since 0.94.7. Should finish this. Moving on to 0.94.12 for now.
[~jxiang] What do you think. Is this safe, good to go? (Can't say I'm an expert on the this part of the code).
                
> -ROOT-/.META. regions are hanging if master restarted while closing -ROOT-/.META. regions on dead RS
> ----------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-8353
>                 URL: https://issues.apache.org/jira/browse/HBASE-8353
>             Project: HBase
>          Issue Type: Bug
>          Components: Region Assignment
>    Affects Versions: 0.94.6
>            Reporter: rajeshbabu
>            Assignee: rajeshbabu
>             Fix For: 0.94.12
>
>         Attachments: HBASE-8353_94_2.patch, HBASE-8353_94_3.patch, HBASE-8353_94_4.patch, HBASE-8353_94.patch
>
>
> ROOT/META are not getting assigned if master restarted while closing ROOT/META.
> Lets suppose catalog table regions in M_ZK_REGION_CLOSING state during master initialization and then just we are adding the them to RIT and waiting for TM. {code}
>         if (isOnDeadServer(regionInfo, deadServers) &&
>             (data.getOrigin() == null || !serverManager.isServerOnline(data.getOrigin()))) {
>           // If was on dead server, its closed now. Force to OFFLINE and this
>           // will get it reassigned if appropriate
>           forceOffline(regionInfo, data);
>         } else {
>           // Just insert region into RIT.
>           // If this never updates the timeout will trigger new assignment
>           regionsInTransition.put(encodedRegionName, new RegionState(
>             regionInfo, RegionState.State.CLOSING,
>             data.getStamp(), data.getOrigin()));
>         }
> {code}
> isOnDeadServer always return false to ROOT/META because deadServers is null.
> Even TM cannot close them properly because its not available in online regions since its not yet assigned.
> {code}
>     synchronized (this.regions) {
>       // Check if this region is currently assigned
>       if (!regions.containsKey(region)) {
>         LOG.debug("Attempted to unassign region " +
>           region.getRegionNameAsString() + " but it is not " +
>           "currently assigned anywhere");
>         return;
>       }
>     }
> {code}

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