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HBase >> mail # user >> help why do my regionservers shut themselves down?

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Re: help why do my regionservers shut themselves down?
Hi Kaveh,

  How large is your heap that you are using?  Also, what GC settings do you
have in place?  Your main issues looks to be here:

2013-04-22 16:47:21,843 FATAL
ABORTING region server
,60020,**1366657358443, load=(requests=5
392, regions=196, usedHeap=1063, maxHeap=3966): regionserver:60020-**
0x13dd980d2ab8661-**0x13dd980d2ab8661 regionserver:60020-**0x13dd980d2
ab8661-**0x13dd980d2ab8661 received expired fr
om ZooKeeper, aborting
KeeperErrorCode = Session expired
        at org.apache.hadoop.hbase.**zookeeper.ZooKeeperWatcher.**connectio
        at org.apache.hadoop.hbase.**zookeeper.ZooKeeperWatcher.**process(
        at org.apache.zookeeper.**ClientCnxn$EventThread.**processEvent(
        at org.apache.zookeeper.**ClientCnxn$EventThread.run(**ClientCnxn.

The interesting part comes afterwards:

2013-04-22 16:47:21,900 WARN org.apache.hadoop.hbase.**regionserver.wal.HLog:
Too many consecutive RollWriter requests, it's a sign of the total number
of live datanodes is lower than the tolerable replicas.

  Are you also seeing your Datanodes drop off the network or become dead
nodes?  My thought is this could be networking issues, oversubscribed
nodes, or GC issues.

On Tue, Apr 23, 2013 at 12:47 AM, kaveh minooie <[EMAIL PROTECTED]> wrote:

> thanks everyone for responding.
> No I don't have the GC logs. I don't even know how i can get that. but it
> seems that the regionserver did recovere from that and then gets into
> trouble here:
> 2013-04-22 16:47:56,830 INFO org.apache.hadoop.hbase.**regionserver.HRegion:
> compaction interrupted by user:
> java.io.**InterruptedIOException: Aborting compaction of store f in
> region t1_webpage,com.pandora.www:**http/shaggy,1366670139658.**
> 9f565d5da3468c0725e590dc232abc**23. because user requested stop.
> the part that I don't understand is what it means when it say "compaction
> interrupted by user"!
> and to answer your question ted, I am using 0.90.6 over hadoop 1.1.1 ( i
> can't upgrade since gora so far only works with .90.x ) and no everything
> was normal as far as I could say the map jobs were staggering since, i
> assume, the hbase became unresponsive  ( the web interface start showing
> exception and that is how i figured out that that regionserver was down) ,
> while i was restarting this one ( through the status command in shell ) i
> noticed that two more regionserver went down ( with identicall error , the
> second one, not the one about GC pause ) but once I restarted the
> regionservers (using hbase-daemon.sh)  everything went back to normal.  but
> this keeps happening and as a result i can't left my jobs unsupervised.
> thanks,
> On 04/22/2013 07:35 PM, Ted Yu wrote:
>> Kaveh:
>> What version of HBase are you using ?
>> Around 2013-04-22 16:47:56, did you observe anything else happening in
>> your
>> cluster ? See below:
>> 2013-04-22 16:47:56,830 INFO org.apache.hadoop.hbase.****
>> regionserver.HRegion:
>> compaction interrupted by user:
>> java.io.****InterruptedIOException: Aborting compaction of store f in
>> region
>> t1_webpage,com.pandora.www:****http/shaggy,1366670139658.****9f565d5
>> da3468c0725e590dc232abc**23. because user requested stop.
>>          at org.apache.hadoop.hbase.****regionserver.Store.compact(****
>> Store.
>> java:998)
>>          at org.apache.hadoop.hbase.****regionserver.Store.compact(****
>> Store.
>> java:779)
>>          at org.apache.hadoop.hbase.****regionserver.HRegion.****
>> compactStores(
>> HRegion.java:**776)
>> On Mon, Apr 22, 2013 at 6:46 PM, Jean-Marc Spaggiari <
>> [EMAIL PROTECTED]> wrote:
>>  Hi Kaveh,
>>> the respons is maybe already displayed on the logs you sent ;)
>>> "This disconnect could have been caused by a network partition or a
Kevin O'Dell
Systems Engineer, Cloudera