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From Andrew Purtell <apurt...@apache.org>
Subject Re: Coprocessor tax?
Date Tue, 01 Mar 2011 19:59:01 GMT
There are null checks for unit tests when the coprocessor host is not loaded:

  if (cpHost != null) {
     // foo
  }

  // no...

So one option is to instantiate it on demand only after a CP is loaded.

Best regards,

    - Andy


--- On Tue, 3/1/11, Stack <stack@duboce.net> wrote:

> From: Stack <stack@duboce.net>
> Subject: Coprocessor tax?
> To: "HBase Dev List" <dev@hbase.apache.org>
> Date: Tuesday, March 1, 2011, 11:51 AM
> So, I'm debugging something else but
> thread dumping I see a bunch of this:
> 
> 
> "IPC Server handler 6 on 61020" daemon prio=10
> tid=0x00000000422d2800
> nid=0x7714 runnable [0x00007f1c5acea000]
>    java.lang.Thread.State: RUNNABLE
>         at
> java.util.concurrent.locks.ReentrantReadWriteLock$Sync.fullTryAcquireShared(ReentrantReadWriteLock.java:434)
>         at
> java.util.concurrent.locks.ReentrantReadWriteLock$Sync.tryAcquireShared(ReentrantReadWriteLock.java:404)
>         at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1260)
>         at
> java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:594)
>         at
> org.apache.hadoop.hbase.regionserver.RegionCoprocessorHost.prePut(RegionCoprocessorHost.java:532)
>         at
> org.apache.hadoop.hbase.regionserver.HRegion.doMiniBatchPut(HRegion.java:1476)
>         at
> org.apache.hadoop.hbase.regionserver.HRegion.put(HRegion.java:1454)
>         at
> org.apache.hadoop.hbase.regionserver.HRegionServer.multi(HRegionServer.java:2652)
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
>         at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>         at
> java.lang.reflect.Method.invoke(Method.java:597)
>         at
> org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:309)
>         at
> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1060)
> 
> 
> Do others?  I don't have any CPs loaded.  I'm
> wondering if we can do
> more to just avoid the CP codepath if no CPs loaded.
> 
> St.Ack
> 


      

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