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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-3669) Region in PENDING_OPEN keeps being bounced between RS and master
Date Mon, 02 May 2011 22:15:03 GMT

     [ https://issues.apache.org/jira/browse/HBASE-3669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jean-Daniel Cryans updated HBASE-3669:
--------------------------------------

    Fix Version/s:     (was: 0.90.3)

Fixing anything here would require some heavy handed reworks so I opened HBASE-3846 to address
upping the timeout and I'm moving this to 0.92

> Region in PENDING_OPEN keeps being bounced between RS and master
> ----------------------------------------------------------------
>
>                 Key: HBASE-3669
>                 URL: https://issues.apache.org/jira/browse/HBASE-3669
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.90.1
>            Reporter: Jean-Daniel Cryans
>            Priority: Critical
>             Fix For: 0.92.0
>
>         Attachments: HBASE-3669-debug-v1.patch
>
>
> After going crazy killing region servers after HBASE-3668, most of the cluster recovered
except for 3 regions that kept being refused by the region servers.
> One the master I would see:
> {code}
> 2011-03-17 22:23:14,828 INFO org.apache.hadoop.hbase.master.AssignmentManager: Regions
in transition timed out:  supr_rss_items,ea0a3ac6c8779dab:872333599:ed1a7ad00f076fd98fcd3adcd98b62c6,1285707378709.f11849557c64c4efdbe0498f3fe97a21.
state=PENDING_OPEN, ts=1300400554826
> 2011-03-17 22:23:14,828 INFO org.apache.hadoop.hbase.master.AssignmentManager: Region
has been PENDING_OPEN for too long, reassigning region=supr_rss_items,ea0a3ac6c8779dab:872333599:ed1a7ad00f076fd98fcd3adcd98b62c6,1285707378709.f11849557c64c4efdbe0498f3fe97a21.
> 2011-03-17 22:23:14,828 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Forcing
OFFLINE; was=supr_rss_items,ea0a3ac6c8779dab:872333599:ed1a7ad00f076fd98fcd3adcd98b62c6,1285707378709.f11849557c64c4efdbe0498f3fe97a21.
state=PENDING_OPEN, ts=1300400554826
> 2011-03-17 22:23:14,828 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: No previous
transition plan was found (or we are ignoring an existing plan) for supr_rss_items,ea0a3ac6c8779dab:872333599:ed1a7ad00f076fd98fcd3adcd98b62c6,1285707378709.f11849557c64c4efdbe0498f3fe97a21.
so generated a random one; hri=supr_rss_items,ea0a3ac6c8779dab:872333599:ed1a7ad00f076fd98fcd3adcd98b62c6,1285707378709.f11849557c64c4efdbe0498f3fe97a21.,
src=, dest=sv2borg171,60020,1300399357135; 17 (online=17, exclude=null) available servers
> 2011-03-17 22:23:14,828 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Assigning
region supr_rss_items,ea0a3ac6c8779dab:872333599:ed1a7ad00f076fd98fcd3adcd98b62c6,1285707378709.f11849557c64c4efdbe0498f3fe97a21.
to sv2borg171,60020,1300399357135
> {code}
> Then on the region server:
> {code}
> 2011-03-17 22:23:14,829 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: regionserver:60020-0x22d627c142707d2
Attempting to transition node f11849557c64c4efdbe0498f3fe97a21 from M_ZK_REGION_OFFLINE to
RS_ZK_REGION_OPENING
> 2011-03-17 22:23:14,832 DEBUG org.apache.hadoop.hbase.zookeeper.ZKUtil: regionserver:60020-0x22d627c142707d2
Retrieved 166 byte(s) of data from znode /hbase/unassigned/f11849557c64c4efdbe0498f3fe97a21;
data=region=supr_rss_items,ea0a3ac6c8779dab:872333599:ed1a7ad00f076fd98fcd3adcd98b62c6,1285707378709.f11849557c64c4efdbe0498f3fe97a21.,
server=sv2borg180,60020,1300384550966, state=RS_ZK_REGION_OPENING
> 2011-03-17 22:23:14,832 WARN org.apache.hadoop.hbase.zookeeper.ZKAssign: regionserver:60020-0x22d627c142707d2
Attempt to transition the unassigned node for f11849557c64c4efdbe0498f3fe97a21 from M_ZK_REGION_OFFLINE
to RS_ZK_REGION_OPENING failed, the node existed but was in the state RS_ZK_REGION_OPENING
> 2011-03-17 22:23:14,832 WARN org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler:
Failed transition from OFFLINE to OPENING for region=f11849557c64c4efdbe0498f3fe97a21
> {code}
> I'm not sure I fully understand what was going on... the master was suppose to OFFLINE
the znode but then that's not what the region server was seeing? In any case, I was able to
recover by doing a force unassign for each region and then assign.

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