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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-790) During import, single region blocks requests for >10 minutes, thread dumps, throws out pending requests, and continues
Date Fri, 01 Aug 2008 00:38:32 GMT
During import, single region blocks requests for >10 minutes, thread dumps, throws out pending
requests, and continues
----------------------------------------------------------------------------------------------------------------------

                 Key: HBASE-790
                 URL: https://issues.apache.org/jira/browse/HBASE-790
             Project: Hadoop HBase
          Issue Type: Bug
          Components: regionserver
    Affects Versions: 0.2.0
         Environment: 11 node cluster.  1 master w/ namenodes and hmaster.  10 slaves w/ datanodes
and regionservers.  All are 2GHz quad core xeons, 4gb ram, raid 0.
            Reporter: Jonathan Gray
             Fix For: 0.2.0


During a batch import, I have two processes importing into a single region.

The behavior I saw was a regionserver with 2 regions of the table in question on it.  The
first region split, and the new regions were reassigned to another regionserver.

Following that, inserting into the region that was left over began to block client requests.
 I am attaching the regionserver log; below is the specific problem area:

2008-07-31 15:38:24,190 DEBUG org.apache.hadoop.hbase.client.HConnectionManager$TableServers:
Cache hit in table locations for row <> and tableName .META.: location server 72.34.249.217:60020,
location region name .META.,,1
2008-07-31 15:38:24,194 INFO org.apache.hadoop.hbase.regionserver.CompactSplitThread: region
split, META updated, and report to master all successful. Old region=REGION => {NAME =>
'items,01beddd6-813b-4f2b-ac48-a0cef395cb7e,12175434512
2008-07-31 15:38:34,052 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 7 on 60020' on region items,8001eb31-98bb-4087-bd8d-e4b42805addb,1217543451296:
Memcache size 64.0m is >= than blocking
2008-07-31 15:39:00,270 INFO org.apache.hadoop.ipc.Server: IPC Server handler 8 on 60020,
call batchUpdate([B@17b4239f, row => 02c241b4-9d32-452d-8dab-247f4af693eb, {column =>
content:title, value => '...', column => content:content, va
org.apache.hadoop.hbase.NotServingRegionException: items,01beddd6-813b-4f2b-ac48-a0cef395cb7e,1217543451296
        at org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:1436)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.batchUpdate(HRegionServer.java:1147)
        at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at org.apache.hadoop.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:473)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)
2008-07-31 15:39:09,547 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 8 on 60020' on region items,8001eb31-98bb-4087-bd8d-e4b42805addb,1217543451296:
Memcache size 64.0m is >= than blocking
2008-07-31 15:39:44,079 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 9 on 60020' on region items,8001eb31-98bb-4087-bd8d-e4b42805addb,1217543451296:
Memcache size 64.0m is >= than blocking
2008-07-31 15:40:19,574 INFO org.apache.hadoop.hbase.regionserver.HRegion: Blocking updates
for 'IPC Server handler 1 on 60020' on region items,8001eb31-98bb-4087-bd8d-e4b42805addb,1217543451296:
Memcache size 64.0m is >= than blocking
2008-07-31 15:49:09,130 INFO org.apache.hadoop.hbase.regionserver.LogRoller: Rolling hlog.
Number of entries: 1
2008-07-31 15:49:09,144 DEBUG org.apache.hadoop.hbase.regionserver.HLog: Closing current log
writer /hbase/log_72.34.249.212_1217535541159_60020/hlog.dat.1217543884691
2008-07-31 15:49:09,146 INFO org.apache.hadoop.hbase.regionserver.HLog: New log writer created
at /hbase/log_72.34.249.212_1217535541159_60020/hlog.dat.1217544549145
2008-07-31 16:03:09,060 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Started memcache
flush for region items,8001eb31-98bb-4087-bd8d-e4b42805addb,1217543451296. Current region
memcache size 64.0m
2008-07-31 16:03:09,467 INFO org.apache.hadoop.hbase.regionserver.HRegion: Unblocking updates
for region items,8001eb31-98bb-4087-bd8d-e4b42805addb,1217543451296 'IPC Server handler 5
on 60020'
2008-07-31 16:03:09,478 INFO org.apache.hadoop.ipc.Server: Process Thread Dump: Discarding
call batchUpdate([B@4e727e0e, row => c08408b4-b68c-433c-ba3f-d46d3ba73288, {column =>
content:title, value => '...', column => content:content, v


As you can see there was a 14 minute delay between updates being blocked, and the unblocking
occurring.

All the pending batchUpdates were thrown out (too old) and then importing proceeded normally.

The same behavior repeated itself later on a different regionserver, and again after a while
it unfroze, kicked out pending updates, and continued.

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