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https://issues.apache.org/jira/browse/HBASE-4351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13100395#comment-13100395
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ramkrishna.s.vasudevan commented on HBASE-4351:
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The impact could be like the region is removed from the regions map in master
and until we restart the master becomes unaware of the region.
Kindly correct me if am wrong.
> If from Admin we try to unassign a region forcefully, though a valid region
> name is given the master is not able to identify the region to unassign.
> ----------------------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-4351
> URL: https://issues.apache.org/jira/browse/HBASE-4351
> Project: HBase
> Issue Type: Bug
> Environment: Linux
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
>
> The following is the problem
> Get the exact region name from UI and call
> HBaseAdmin.unassign(regionname, true).
> Here true is forceful option.
> As part of unassign api
> {code}
> public void unassign(final byte [] regionName, final boolean force)
> throws IOException {
> Pair<HRegionInfo, HServerAddress> pair =
> MetaReader.getRegion(this.catalogTracker, regionName);
> if (pair == null) throw new
> UnknownRegionException(Bytes.toStringBinary(regionName));
> HRegionInfo hri = pair.getFirst();
> if (force) this.assignmentManager.clearRegionFromTransition(hri);
> this.assignmentManager.unassign(hri, force);
> }
> {code}
> As part of clearRegionFromTransition()
> {code}
> synchronized (this.regions) {
> this.regions.remove(hri);
> for (Set<HRegionInfo> regions : this.servers.values()) {
> regions.remove(hri);
> }
> }
> {code}
> the region is also removed. Hence when the master tries to identify the
> region
> {code}
> if (!regions.containsKey(region)) {
> debugLog(region, "Attempted to unassign region " +
> region.getRegionNameAsString() + " but it is not " +
> "currently assigned anywhere");
> return;
> }
> {code}
> It is not able to identify the region. It exists in trunk and 0.90.x also.
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