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From Stack <st...@duboce.net>
Subject Re: Coprocessor tax?
Date Tue, 01 Mar 2011 20:01:48 GMT
Yeah, that'd help.

Chatting with Ryan, he wonders if the lock is needed at all?  Would a
CopyOnWrite do here?

St.Ack

On Tue, Mar 1, 2011 at 11:59 AM, Andrew Purtell <apurtell@apache.org> wrote:
> 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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