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https://issues.apache.org/jira/browse/HBASE-8627?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13715035#comment-13715035
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rajeshbabu commented on HBASE-8627:
-----------------------------------
[~anoop.hbase]
If meta server znode is deleted(in metaSSH), then patch is not able to fix this
issue.
{code}
public void assignMeta() throws KeeperException {
MetaRegionTracker.deleteMetaLocation(this.watcher);
assign(HRegionInfo.FIRST_META_REGIONINFO, true);
}
{code}
In recordMetaRegion we will read meta location from zk, in this case we will
get false and returing without fixing.
{code}
// get regions according to what is online on each RegionServer
loadDeployedRegions();
// check whether .META. is deployed and online
if (!recordMetaRegion()) {
// Will remove later if we can fix it
errors.reportError("Fatal error: unable to get .META. region location.
Exiting...");
return -2;
}
{code}
I think in checkMetaRegion only we need to read from zk and deployed regions
list. If it is not present in any case we need to deploy it.
Here is the test to reproduce the scenario. FYI
{code}
@Test
public void testFixAssignmentsWhenMETAinTransition() throws Exception {
MiniHBaseCluster cluster = TEST_UTIL.getHBaseCluster();
HBaseAdmin admin = null;
try {
admin = new HBaseAdmin(TEST_UTIL.getConfiguration());
admin.closeRegion(cluster.getServerHoldingMeta(),
HRegionInfo.FIRST_META_REGIONINFO);
} finally {
if (admin != null) {
admin.close();
}
}
regionStates.regionOffline(HRegionInfo.FIRST_META_REGIONINFO);
MetaRegionTracker.deleteMetaLocation(cluster.getMaster().getZooKeeper());
assertFalse(regionStates
.isRegionAssigned(HRegionInfo.FIRST_META_REGIONINFO));
HBaseFsck hbck = doFsck(conf, true);
assertErrors(hbck, new ERROR_CODE[] { ERROR_CODE.NULL_META_REGION,
ERROR_CODE.UNKNOWN });
assertNoErrors(doFsck(conf, false));
}
{code}
> HBCK can not fix meta not assigned issue
> ----------------------------------------
>
> Key: HBASE-8627
> URL: https://issues.apache.org/jira/browse/HBASE-8627
> Project: HBase
> Issue Type: Bug
> Components: hbck
> Affects Versions: 0.95.0
> Reporter: Anoop Sam John
> Assignee: Anoop Sam John
> Attachments: HBASE-8627_Trunk.patch, HBASE-8627_Trunk-V2.patch
>
>
> When meta table region is not assigned to any RS, HBCK run will get
> exception. I can see code added in checkMetaRegion() to solve this issue but
> it wont work. It still refers to ROOT region!
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