hbase-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-818) Deadlock running 'flushSomeRegions'
Date Mon, 11 Aug 2008 23:54:44 GMT
Deadlock running 'flushSomeRegions'
-----------------------------------

                 Key: HBASE-818
                 URL: https://issues.apache.org/jira/browse/HBASE-818
             Project: Hadoop HBase
          Issue Type: Bug
            Reporter: stack
            Priority: Blocker
             Fix For: 0.2.1, 0.3.0


Playing with MR uploading no a regionserver with 60+ regions, I ran into a deadlock:

{code}
Found one Java-level deadlock:
=============================
"IPC Server handler 19 on 60020":
  waiting to lock monitor 0x084be38c (object 0xb6f69a70, a org.apache.hadoop.hbase.regionserver.Flusher),
  which is held by "IPC Server handler 16 on 60020"
"IPC Server handler 16 on 60020":
  waiting to lock monitor 0x080f8dec (object 0xb73610c0, a org.apache.hadoop.hbase.regionserver.HRegion$WriteState),
  which is held by "IPC Server handler 2 on 60020"
"IPC Server handler 2 on 60020":
  waiting to lock monitor 0x086e8fe8 (object 0xb6f69cf0, a java.util.HashSet),
  which is held by "IPC Server handler 16 on 60020"

Java stack information for the threads listed above:
===================================================
"IPC Server handler 19 on 60020":
        at org.apache.hadoop.hbase.regionserver.Flusher.flushSomeRegions(Flusher.java:261)
        - waiting to lock <0xb6f69a70> (a org.apache.hadoop.hbase.regionserver.Flusher)
        at org.apache.hadoop.hbase.regionserver.Flusher.reclaimMemcacheMemory(Flusher.java:252)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.batchUpdate(HRegionServer.java:1136)
        at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:623)
        at org.apache.hadoop.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:473)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)
"IPC Server handler 16 on 60020":
        at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:948)
        - waiting to lock <0xb73610c0> (a org.apache.hadoop.hbase.regionserver.HRegion$WriteState)
        at org.apache.hadoop.hbase.regionserver.Flusher.flushRegion(Flusher.java:173)
        - locked <0xb6f69cf0> (a java.util.HashSet)
        at org.apache.hadoop.hbase.regionserver.Flusher.flushSomeRegions(Flusher.java:267)
        - locked <0xb6f69a70> (a org.apache.hadoop.hbase.regionserver.Flusher)
        at org.apache.hadoop.hbase.regionserver.Flusher.reclaimMemcacheMemory(Flusher.java:252)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.batchUpdate(HRegionServer.java:1136)
        at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:623)
        at org.apache.hadoop.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:473)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)
"IPC Server handler 2 on 60020":
        at org.apache.hadoop.hbase.regionserver.Flusher.addRegion(Flusher.java:237)
        - waiting to lock <0xb6f69cf0> (a java.util.HashSet)
        at org.apache.hadoop.hbase.regionserver.Flusher.request(Flusher.java:114)
        at org.apache.hadoop.hbase.regionserver.HRegion.requestFlush(HRegion.java:1627)
        - locked <0xb73610c0> (a org.apache.hadoop.hbase.regionserver.HRegion$WriteState)
        at org.apache.hadoop.hbase.regionserver.HRegion.update(HRegion.java:1614)
        at org.apache.hadoop.hbase.regionserver.HRegion.batchUpdate(HRegion.java:1398)
        at org.apache.hadoop.hbase.regionserver.HRegionServer.batchUpdate(HRegionServer.java:1137)
        at sun.reflect.GeneratedMethodAccessor3.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:623)
        at org.apache.hadoop.hbase.ipc.HbaseRPC$Server.call(HbaseRPC.java:473)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:896)

Found 1 deadlock.
{code}

Regionserver is hosed.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.


Mime
View raw message