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https://issues.apache.org/jira/browse/HBASE-4400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan updated HBASE-4400:
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Attachment: HBASE-4400_0.90_1.patch
> .META. getting stuck if RS hosting it is dead and znode state is in
> RS_ZK_REGION_OPENED
> ---------------------------------------------------------------------------------------
>
> Key: HBASE-4400
> URL: https://issues.apache.org/jira/browse/HBASE-4400
> Project: HBase
> Issue Type: Bug
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 0.92.0, 0.90.5
>
> Attachments: HBASE-4400_0.90.patch, HBASE-4400_0.90_1.patch,
> HBASE-4400_trunk.patch, HBASE-4400_trunk_1.patch
>
>
> Start 2 RS.
> The .META. is being hosted by RS2 but while processing it goes down.
> Now restart the master and RS1. Master gets the RS name from the znode in
> RS_ZK_REGION_OPENED. But as RS2 is not online still the master is not able
> to process the META at all. Please find the logs
> {noformat}
> 2011-09-14 16:43:51,949 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Handling
> transition=RS_ZK_REGION_OPENING, server=linux76,60020,1315998828523,
> region=70236052/-ROOT-
> 2011-09-14 16:43:51,968 INFO org.apache.hadoop.hbase.master.HMaster: -ROOT-
> assigned=1, rit=false, location=linux76:60020
> 2011-09-14 16:43:51,970 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: Processing region
> .META.,,1.1028785192 in state RS_ZK_REGION_OPENED
> 2011-09-14 16:43:51,970 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: Failed to find
> linux146,60020,1315998414623 in list of online servers; skipping registration
> of open of .META.,,1.1028785192
> 2011-09-14 16:43:51,971 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: Waiting on 1028785192/.META.
> 2011-09-14 16:43:51,983 DEBUG
> org.apache.hadoop.hbase.master.AssignmentManager: Handling
> transition=RS_ZK_REGION_OPENED, server=linux76,60020,1315998828523,
> region=70236052/-ROOT-
> 2011-09-14 16:43:51,986 DEBUG
> org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: Handling OPENED
> event for 70236052; deleting unassigned node
> 2011-09-14 16:43:51,986 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign:
> master:60000-0x13267854032001d Deleting existing unassigned node for 70236052
> that is in expected state RS_ZK_REGION_OPENED
> 2011-09-14 16:43:51,998 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign:
> master:60000-0x13267854032001d Successfully deleted unassigned node for
> region 70236052 in expected state RS_ZK_REGION_OPENED
> 2011-09-14 16:43:51,999 DEBUG
> org.apache.hadoop.hbase.master.handler.OpenedRegionHandler: Opened region
> -ROOT-,,0.70236052 on linux76,60020,1315998828523
> 2011-09-14 16:44:00,945 INFO org.apache.hadoop.hbase.master.ServerManager:
> Registering server=linux146,60020,1315998839724, regionCount=0, userLoad=false
> 2011-09-14 16:46:20,003 INFO
> org.apache.hadoop.hbase.master.AssignmentManager: Regions in transition timed
> out: .META.,,1.1028785192 state=OPEN, ts=0
> 2011-09-14 16:46:20,004 ERROR
> org.apache.hadoop.hbase.master.AssignmentManager: Region has been OPEN for
> too long, we don't know where region was opened so can't do anything
> {noformat}
> {code}
> regionsInTransition.put(encodedRegionName, new RegionState(
> regionInfo, RegionState.State.OPEN, data.getStamp()));
> ................
> } else {
> HServerInfo hsi = this.serverManager.getServerInfo(sn);
> if (hsi == null) {
> LOG.info("Failed to find " + sn +
> " in list of online servers; skipping registration of open of "
> +
> regionInfo.getRegionNameAsString());
> } else {
> new OpenedRegionHandler(master, this, regionInfo, hsi).process();
> }
> }
> {code}
> So timeout monitor is not able to do anything here
> {code}
> LOG.error("Region has been OPEN for too long, " +
> "we don't know where region was opened so can't do anything");
> synchronized(regionState) {
> regionState.update(regionState.getState());
> }
> {code}
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