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https://issues.apache.org/jira/browse/HBASE-790?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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stack updated HBASE-790:
------------------------
Attachment: 790-v2.patch
Patch for jon gray to test.
Usually block/unblock runs fine but then it hangs. Logging added by earlier
patch shows no flush has been queued. Our mechanism for queuing flushes and
subsequent clear of flush flag is faulty. This patch is a bit of a hack that
does check before we go into HRegion synchronized method.
> 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
>
> Attachments: 790-v2.patch, 790.patch, regionserver-lockup.log
>
>
> 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$TableServers: Cache hit in
> table locations for row <> and tableName .META.: location server
> 72.34.249.217:60020, location region name .META.,,1
> 2008-07-31 15:38:24,194 INFO
> org.apache.hadoop.hbase.regionserver.CompactSplitThread: region split, META
> updated, and report to master all successful. Old region=REGION => {NAME =>
> 'items,01beddd6-813b-4f2b-ac48-a0cef395cb7e,12175434512
> 2008-07-31 15:38:34,052 INFO org.apache.hadoop.hbase.regionserver.HRegion:
> Blocking updates for 'IPC Server handler 7 on 60020' on region
> items,8001eb31-98bb-4087-bd8d-e4b42805addb,1217543451296: Memcache size 64.0m
> is >= than blocking
> 2008-07-31 15:39:00,270 INFO org.apache.hadoop.ipc.Server: IPC Server handler
> 8 on 60020, call batchUpdate([EMAIL PROTECTED], row =>
> 02c241b4-9d32-452d-8dab-247f4af693eb, {column => content:title, value =>
> '...', column => content:content, va
> org.apache.hadoop.hbase.NotServingRegionException:
> items,01beddd6-813b-4f2b-ac48-a0cef395cb7e,1217543451296
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:1436)
> at
> org.apache.hadoop.hbase.regionserver.HRegionServer.batchUpdate(HRegionServer.java:1147)
> at sun.reflect.GeneratedMethodAccessor12.invoke(Unknown Source)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:616)
> at org.apache.hadoop.hbase.ipc.HbaseRPC$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([EMAIL PROTECTED], 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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