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From "Maryann Xue (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-6299) RS starts region open while fails ack to HMaster.sendRegionOpen() causes inconsistency in HMaster's region state and a series of successive problems.
Date Sun, 01 Jul 2012 05:08:43 GMT
Maryann Xue created HBASE-6299:
----------------------------------

             Summary: RS starts region open while fails ack to HMaster.sendRegionOpen() causes
inconsistency in HMaster's region state and a series of successive problems.
                 Key: HBASE-6299
                 URL: https://issues.apache.org/jira/browse/HBASE-6299
             Project: HBase
          Issue Type: Bug
          Components: master
    Affects Versions: 0.94.0, 0.90.6
            Reporter: Maryann Xue
            Assignee: Maryann Xue
            Priority: Critical


1. HMaster tries to assign a region to an RS.
2. HMaster creates a RegionState for this region and puts it into regionsInTransition.
3. In the first assign attempt, HMaster calls RS.openRegion(). The RS receives the open region
request and starts to proceed, with success eventually. However, due to network problems,
HMaster fails to receive the response for the openRegion() call, and the call times out.
4. HMaster attemps to assign for a second time, choosing another RS. 
5. But since the HMaster's OpenedRegionHandler has been triggered by the region open of the
previous RS, and the RegionState has already been removed from regionsInTransition, HMaster
finds invalid and ignores the unassigned ZK node "RS_ZK_REGION_OPENING" updated by the second
attempt.
6. The unassigned ZK node stays and a later unassign fails coz RS_ZK_REGION_CLOSING cannot
be created.
{code}
2012-06-29 07:03:38,870 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Using pre-existing
plan for region CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.;
plan=hri=CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.,
src=swbss-hadoop-004,60020,1340890123243, dest=swbss-hadoop-006,60020,1340890678078
2012-06-29 07:03:38,870 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Assigning
region CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
to swbss-hadoop-006,60020,1340890678078
2012-06-29 07:03:38,870 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=M_ZK_REGION_OFFLINE,
server=swbss-hadoop-002:60000, region=b713fd655fa02395496c5a6e39ddf568
2012-06-29 07:06:28,882 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENING,
server=swbss-hadoop-006,60020,1340890678078, region=b713fd655fa02395496c5a6e39ddf568
2012-06-29 07:06:32,291 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENING,
server=swbss-hadoop-006,60020,1340890678078, region=b713fd655fa02395496c5a6e39ddf568
2012-06-29 07:06:32,299 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENED,
server=swbss-hadoop-006,60020,1340890678078, region=b713fd655fa02395496c5a6e39ddf568
2012-06-29 07:06:32,299 DEBUG org.apache.hadoop.hbase.master.handler.OpenedRegionHandler:
Handling OPENED event for CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
from serverName=swbss-hadoop-006,60020,1340890678078, load=(requests=518945, regions=575,
usedHeap=15282, maxHeap=31301); deleting unassigned node
2012-06-29 07:06:32,299 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: master:60000-0x2377fee2ae80007
Deleting existing unassigned node for b713fd655fa02395496c5a6e39ddf568 that is in expected
state RS_ZK_REGION_OPENED
2012-06-29 07:06:32,301 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: master:60000-0x2377fee2ae80007
Successfully deleted unassigned node for region b713fd655fa02395496c5a6e39ddf568 in expected
state RS_ZK_REGION_OPENED
2012-06-29 07:06:32,301 DEBUG org.apache.hadoop.hbase.master.handler.OpenedRegionHandler:
The master has opened the region CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
that was online on serverName=swbss-hadoop-006,60020,1340890678078, load=(requests=518945,
regions=575, usedHeap=15282, maxHeap=31301)
2012-06-29 07:07:41,140 WARN org.apache.hadoop.hbase.master.AssignmentManager: Failed assignment
of CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
to serverName=swbss-hadoop-006,60020,1340890678078, load=(requests=0, regions=575, usedHeap=0,
maxHeap=0), trying to assign elsewhere instead; retry=0
java.net.SocketTimeoutException: Call to /172.16.0.6:60020 failed on socket timeout exception:
java.net.SocketTimeoutException: 120000 millis timeout while waiting for channel to be ready
for read. ch : java.nio.channels.SocketChannel[connected local=/172.16.0.2:53765 remote=/172.16.0.6:60020]
        at org.apache.hadoop.hbase.ipc.HBaseClient.wrapException(HBaseClient.java:805)
        at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:778)
        at org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:283)
        at $Proxy8.openRegion(Unknown Source)
        at org.apache.hadoop.hbase.master.ServerManager.sendRegionOpen(ServerManager.java:573)
        at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1127)
        at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:912)
        at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:892)
        at org.apache.hadoop.hbase.master.handler.ClosedRegionHandler.process(ClosedRegionHandler.java:92)
        at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:162)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.net.SocketTimeoutException: 120000 millis timeout while waiting for channel
to be ready for read. ch : java.nio.channels.SocketChannel[connected local=/172.16.0.2:53765
remote=/172.16.0.6:60020]
        at org.apache.hadoop.net.SocketIOWithTimeout.doIO(SocketIOWithTimeout.java:164)
        at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:155)
        at org.apache.hadoop.net.SocketInputStream.read(SocketInputStream.java:128)
        at java.io.FilterInputStream.read(FilterInputStream.java:116)
        at org.apache.hadoop.hbase.ipc.HBaseClient$Connection$PingInputStream.read(HBaseClient.java:301)
        at java.io.BufferedInputStream.fill(BufferedInputStream.java:218)
        at java.io.BufferedInputStream.read(BufferedInputStream.java:237)
        at java.io.DataInputStream.readInt(DataInputStream.java:370)
        at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:541)
        at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:479)
2012-06-29 07:07:41,142 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: No previous
transition plan was found (or we are ignoring an existing plan) for CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
so generated a random one; hri=CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.,
src=, dest=swbss-hadoop-164,60020,1340888346294; 15 (online=15, exclude=serverName=swbss-hadoop-006,60020,1340890678078,
load=(requests=0, regions=575, usedHeap=0, maxHeap=0)) available servers
2012-06-29 07:07:41,142 DEBUG org.apache.hadoop.hbase.zookeeper.ZKAssign: master:60000-0x2377fee2ae80007
Creating (or updating) unassigned node for b713fd655fa02395496c5a6e39ddf568 with OFFLINE state
2012-06-29 07:07:41,145 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Using pre-existing
plan for region CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.;
plan=hri=CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.,
src=, dest=swbss-hadoop-164,60020,1340888346294
2012-06-29 07:07:41,145 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Assigning
region CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
to swbss-hadoop-164,60020,1340888346294
2012-06-29 07:07:41,149 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENING,
server=swbss-hadoop-164,60020,1340888346294, region=b713fd655fa02395496c5a6e39ddf568
2012-06-29 07:07:41,150 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received OPENING
for region b713fd655fa02395496c5a6e39ddf568 from server swbss-hadoop-164,60020,1340888346294
but region was in  the state null and not in expected PENDING_OPEN or OPENING states
2012-06-29 07:07:41,296 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENING,
server=swbss-hadoop-164,60020,1340888346294, region=b713fd655fa02395496c5a6e39ddf568
2012-06-29 07:07:41,296 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received OPENING
for region b713fd655fa02395496c5a6e39ddf568 from server swbss-hadoop-164,60020,1340888346294
but region was in  the state null and not in expected PENDING_OPEN or OPENING states
2012-06-29 07:07:41,302 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Handling transition=RS_ZK_REGION_OPENED,
server=swbss-hadoop-164,60020,1340888346294, region=b713fd655fa02395496c5a6e39ddf568
2012-06-29 07:07:41,302 WARN org.apache.hadoop.hbase.master.AssignmentManager: Received OPENED
for region b713fd655fa02395496c5a6e39ddf568 from server swbss-hadoop-164,60020,1340888346294
but region was in  the state null and not in expected PENDING_OPEN or OPENING states
2012-06-29 07:08:38,872 INFO org.apache.hadoop.hbase.master.HMaster: balance hri=CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.,
src=swbss-hadoop-006,60020,1340890678078, dest=swbss-hadoop-008,60020,1340891085175
2012-06-29 07:08:38,872 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Starting unassignment
of region CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
(offlining)
2012-06-29 07:08:47,875 DEBUG org.apache.hadoop.hbase.master.AssignmentManager: Sent CLOSE
to serverName=swbss-hadoop-006,60020,1340890678078, load=(requests=0, regions=0, usedHeap=0,
maxHeap=0) for region CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
...
2012-06-29 08:04:37,681 INFO org.apache.hadoop.hbase.master.AssignmentManager: Regions in
transition timed out:  CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
state=PENDING_CLOSE, ts=1340926468331, server=null
2012-06-29 08:04:37,681 INFO org.apache.hadoop.hbase.master.AssignmentManager: Region has
been PENDING_CLOSE for too long, running forced unassign again on region=CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
2012-06-29 08:04:47,681 INFO org.apache.hadoop.hbase.master.AssignmentManager: Regions in
transition timed out:  CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
state=PENDING_CLOSE, ts=1340926468331, server=null
2012-06-29 08:04:47,682 INFO org.apache.hadoop.hbase.master.AssignmentManager: Region has
been PENDING_CLOSE for too long, running forced unassign again on region=CDR_STATS_TRAFFIC,13184390567|20120508|17||2|3|913,1337256975556.b713fd655fa02395496c5a6e39ddf568.
{code}



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