Weird blocking between getOnlineRegion and createRegionLoad
-----------------------------------------------------------
Key: HBASE-3654
URL: https://issues.apache.org/jira/browse/HBASE-3654
Project: HBase
Issue Type: Bug
Affects Versions: 0.90.1
Reporter: Jean-Daniel Cryans
Priority: Blocker
Fix For: 0.90.2
Saw this when debugging something else:
{code}
"regionserver60020" prio=10 tid=0x00007f538c1c0000 nid=0x4c7 runnable
[0x00007f53931da000]
java.lang.Thread.State: RUNNABLE
at
org.apache.hadoop.hbase.regionserver.Store.getStorefilesIndexSize(Store.java:1380)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.createRegionLoad(HRegionServer.java:916)
- locked <0x0000000672aa0a00> (a
java.util.concurrent.ConcurrentSkipListMap)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.buildServerLoad(HRegionServer.java:767)
- locked <0x0000000656f62710> (a java.util.HashMap)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.tryRegionServerReport(HRegionServer.java:722)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:591)
at java.lang.Thread.run(Thread.java:662)
"IPC Reader 9 on port 60020" prio=10 tid=0x00007f538c1be000 nid=0x4c6 waiting
for monitor entry [0x00007f53932db000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getFromOnlineRegions(HRegionServer.java:2295)
- waiting to lock <0x0000000656f62710> (a java.util.HashMap)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getOnlineRegion(HRegionServer.java:2307)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2333)
at
org.apache.hadoop.hbase.regionserver.HRegionServer$QosFunction.isMetaRegion(HRegionServer.java:379)
at
org.apache.hadoop.hbase.regionserver.HRegionServer$QosFunction.apply(HRegionServer.java:422)
at
org.apache.hadoop.hbase.regionserver.HRegionServer$QosFunction.apply(HRegionServer.java:361)
at
org.apache.hadoop.hbase.ipc.HBaseServer.getQosLevel(HBaseServer.java:1126)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Connection.processData(HBaseServer.java:982)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:946)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:522)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:316)
- locked <0x0000000656e60068> (a
org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader)
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)
...
"IPC Reader 0 on port 60020" prio=10 tid=0x00007f538c08b000 nid=0x4bd waiting
for monitor entry [0x00007f5393be4000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getFromOnlineRegions(HRegionServer.java:2295)
- waiting to lock <0x0000000656f62710> (a java.util.HashMap)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getOnlineRegion(HRegionServer.java:2307)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2333)
at
org.apache.hadoop.hbase.regionserver.HRegionServer$QosFunction.isMetaRegion(HRegionServer.java:379)
at
org.apache.hadoop.hbase.regionserver.HRegionServer$QosFunction.apply(HRegionServer.java:422)
at
org.apache.hadoop.hbase.regionserver.HRegionServer$QosFunction.apply(HRegionServer.java:361)
at
org.apache.hadoop.hbase.ipc.HBaseServer.getQosLevel(HBaseServer.java:1126)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Connection.processData(HBaseServer.java:982)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Connection.readAndProcess(HBaseServer.java:946)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Listener.doRead(HBaseServer.java:522)
at
org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader.run(HBaseServer.java:316)
- locked <0x0000000656e635c8> (a
org.apache.hadoop.hbase.ipc.HBaseServer$Listener$Reader)
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)
{code}
All the readers are blocked! I have the feeling something much better could be
done.
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