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From Zhenyu Zhong <zhongresea...@gmail.com>
Subject Re: regionserver disconnection
Date Thu, 12 Nov 2009 18:28:17 GMT
J-D,

Yes, that is weird. But it is what I have in the log. Probably the log is
flushed by different threads, and one thread is blocked for a while?

I set the zookeeper.session.timout=600000, which is 10 minutes. However, we
still see this problem.

Does GC pause for such a long time period?
I will try different GC options to see the differences.

thanks
zhenyu


On Thu, Nov 12, 2009 at 1:10 PM, Jean-Daniel Cryans <jdcryans@apache.org>wrote:

> I see something weird
>
> 2009-11-12 15:04:36,370 WARN
> org.apache.hadoop.hbase.regionserver.HRegionServer: Attempt=1
> org.apache.hadoop.hbase.Leases$LeaseStillHeldException
>        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> Method)
>        at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>        at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
> ...
> 2009-11-12 15:03:52,682 DEBUG org.apache.zookeeper.ClientCnxn: Got
> ping response for sessionid:0x224e55436ad0004 after 0ms
> 2009-11-12 15:04:52,480 WARN org.apache.zookeeper.ClientCnxn:
> Exception closing session 0x24e55436a0007d to
> sun.nio.ch.SelectionKeyImpl@136f6ed1
>
> Goes back in time? I does look better tho. Did you say you set the
> zookeeper session timeout higher in a previous thread? I'd be
> interested to see if a higher (2-3 minutes) value would solve the
> problem until java 7.
>
> The only thing that happens after that LeaseStillHeldException is that
> for some reason (probably GC) the region server paused. This caused
> the session to timeout and should be why the RS isn't connected to the
> ZK quorum member.
>
> BTW we worked with the Zookeeper dev team to have more meaningful
> exceptions and it's already committed in their trunk.
>
> J-D
>
> On Thu, Nov 12, 2009 at 8:40 AM, Zhenyu Zhong <zhongresearch@gmail.com>
> wrote:
> > Follow up on the regionserver disconnection:
> >
> > I made a few changes to the cluster setup.
> > 1. split the regionserver and zookeeper quorum servers, such that HRegion
> > doesn't run on the same box as HQuorumPeer. I assume that there should be
> no
> > disk io contention between the regionserver and zookeeper.
> >    Now we have 14 regionservers, and 5 zookeeper quorum servers.
> >
> > Though I experienced 2 regionserver disconnection this morning, it looks
> > better from the regionserver log. (please see the following log)
> >
> >
> > http://pastebin.com/m496dbfae
> >
> >
> > I checked diskIO for one of the regionserver(192.168.100.116) during the
> > time it disconnected.
> >
> > Time: 03:04:58 AM
> > Device:            tps   Blk_read/s   Blk_wrtn/s   Blk_read   Blk_wrtn
> > sda             105.31      5458.83     19503.64 9043873239 32312473676
> > sda1              2.90         6.64        99.25   10993934  164433464
> > sda2              1.72        23.76        30.25   39365817   50124008
> > sda3              0.30         0.38         3.58     624930    5923000
> > sda4            100.39      5428.06     19370.56 8992888270 32091993204
> >
> >
> > I also checked the zookeeper quorum server that the regionserver tried to
> > connect according to the log. However, I don't see 192.168.100.116 in the
> > client list of the zookeeper quorum server that the regionserver tried to
> > connect.
> > Would that be a problem?
> >
> > Thu Nov 12 15:04:52 UTC 2009
> > Zookeeper version: 3.2.1-808558, built on 08/27/2009 18:48 GMT
> > Clients:
> >  /192.168.100.127:43045[1](queued=0,recved=26,sent=0)
> >  /192.168.100.131:39091[1](queued=0,recved=964,sent=0)
> >  /192.168.100.124:35961[1](queued=0,recved=3266,sent=0)
> >  /192.168.100.123:47935[1](queued=0,recved=233,sent=0)
> >  /192.168.100.125:46931[1](queued=0,recved=2,sent=0)
> >  /192.168.100.118:54924[1](queued=0,recved=295,sent=0)
> >  /192.168.100.118:41390[1](queued=0,recved=2290,sent=0)
> >  /192.168.100.136:42243[1](queued=0,recved=0,sent=0)
> >
> > Latency min/avg/max: 0/17/6333
> > Received: 47111
> > Sent: 0
> > Outstanding: 0
> > Zxid: 0x77000083f4
> > Mode: leader
> > Node count: 23
> >
> > Best,
> > zhenyu
> >
> >
> > On Wed, Nov 11, 2009 at 3:58 PM, Zhenyu Zhong <zhongresearch@gmail.com
> >wrote:
> >
> >> Stack
> >>
> >> I am very appreciated for your comments.
> >> I will use the zookeeper monitoring script on my cluster and let it run
> >> overnight to see the result.
> >> I will follow up the thread when I get anything.
> >>
> >> thanks
> >> zhenyu
> >>
> >>
> >> On Wed, Nov 11, 2009 at 3:52 PM, stack <stack@duboce.net> wrote:
> >>
> >>> I see these in your log too:
> >>>
> >>>
> >>>   1. 2009-11-11 04:27:19,018 DEBUG org.apache.zookeeper.ClientCnxn: Got
> >>>   ping response for sessionid:0x424dfd908c50009 after 4544ms
> >>>   2. 2009-11-11 04:27:19,018 DEBUG org.apache.zookeeper.ClientCnxn: Got
> >>>   ping response for sessionid:0x24dfd90c810002 after 4548ms
> >>>   3. 2009-11-11 04:27:43,960 DEBUG org.apache.zookeeper.ClientCnxn: Got
> >>>   ping response for sessionid:0x424dfd908c50009 after 9030ms
> >>>   4. 2009-11-11 04:27:43,960 DEBUG org.apache.zookeeper.ClientCnxn: Got
> >>>   ping response for sessionid:0x24dfd90c810002 after 9030ms
> >>>   5. 2009-11-11 04:27:48,830 DEBUG org.apache.zookeeper.ClientCnxn: Got
> >>>   ping response for sessionid:0x424dfd908c50009 after 0ms
> >>>   6. 2009-11-11 04:27:48,830 DEBUG org.apache.zookeeper.ClientCnxn: Got
> >>>   ping response for sessionid:0x24dfd90c810002 after 0ms
> >>>
> >>> Which would indicate lag talking to zk too.
> >>>
> >>> Appending HLog also seems to get steadily worse.
> >>>
> >>> I also see these:
> >>>
> >>>
> >>>   1. 2009-11-11 04:27:01,233 WARN org.apache.zookeeper.ClientCnxn:
> >>>    Exception closing session 0x24dfd90c810002 to
> >>>    sun.nio.ch.SelectionKeyImpl@5e16a7e3
> >>>   2. java.io.IOException: Read error rc = -1
> >>>    java.nio.DirectByteBuffer[pos=0 lim=4 cap=4]
> >>>    3.         at
> >>>    org.apache.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:701)
> >>>   4.         at
> >>>    org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:945)
> >>>
> >>>
> >>> Were all 5 quorum members participating?  Check by doing "echo stat|nc
> >>> QUORUM_HOST port" for each member of quorum.... the below might help:
> >>>
> >>> members="1,2,3,4,5"
> >>> while true; do date; for i in $members; do echo $i; echo stat | nc $i
> >>> 2181;
> >>> done; sleep 10; done
> >>>
> >>> We need to improve our zk_dump.  It just reports quorum members... not
> if
> >>> they are actually participating or not.  The above will tell you if
> dead
> >>> or
> >>> alive.
> >>>
> >>> Please report back after checking above and following the Jean-Daniel
> >>> prescription.
> >>>
> >>> Thanks,
> >>> St.Ack
> >>>
> >>>
> >>>
> >>> On Wed, Nov 11, 2009 at 12:29 PM, Zhenyu Zhong <
> zhongresearch@gmail.com
> >>> >wrote:
> >>>
> >>> > Thanks a lot for the help.
> >>> >
> >>> > I understand that the change of disk configurations should be done
> >>> > progressively such that HDFS can balance and recover from a disk
> going
> >>> > away.
> >>> >
> >>> > The data we are trying to import into HBase is about 200million rows,
> >>> each
> >>> > row is about hundreds of bytes. Basically, we read in a text file
> from
> >>> > HDFS,
> >>> > then  for each row in the text file, we fetch data from HBase table,
> we
> >>> > compare the column value and update the latest value back into HBase.
> I
> >>> was
> >>> > suggested to use CheckAndPut.  Anyway this is the common usecase on
> my
> >>> > side.
> >>> >
> >>> >
> >>> > Many thanks
> >>> > zhenyu
> >>> >
> >>> >
> >>> >
> >>> > On Wed, Nov 11, 2009 at 3:03 PM, Jean-Daniel Cryans <
> >>> jdcryans@apache.org
> >>> > >wrote:
> >>> >
> >>> > > 6 disks, 19 machines and you see those kind of issues? I'm quite
> >>> > > surprised and I want to learn more about what you trying to to.
> >>> > >
> >>> > > But first, if hbase is managing ZK for you then you can change
the
> >>> > > value of hbase.zookeeper.property.dataDir so that it points to
its
> own
> >>> > > mount. Make sure you also change dfs.data.dir in conf/hdfs-site.xml
> >>> > > (hadoop stuff) so that it stops pointing there (you should have
6
> >>> > > values there at the moment if you configured it correctly). Doing
> this
> >>> > > could result in data loss if you do it all at once so do the change
> >>> > > progressively. This also means that you may have to keep a seperate
> >>> > > HDFS configuration for those particular nodes. Please ask more
> >>> > > questions if it's not very clear.
> >>> > >
> >>> > > WRT to dedicating nodes to Zookeeeper, it makes sense only if
you
> have
> >>> > > a lot of nodes but in your case, unless there's also CPU
> contention,
> >>> > > you're good with only a dedicated disk.
> >>> > >
> >>> > > Now for what you are trying to do, is this a massive import that
> goes
> >>> > > over many hours? How big is each row? I'd love to get a lot of
> details
> >>> > > to help you optimize your cluster for your particular problem.
> >>> > >
> >>> > > Thx,
> >>> > >
> >>> > > J-D
> >>> > >
> >>> > > On Wed, Nov 11, 2009 at 11:51 AM, Zhenyu Zhong <
> >>> zhongresearch@gmail.com>
> >>> > > wrote:
> >>> > > > J-D,
> >>> > > >
> >>> > > > Thanks a lot for the insightful comments.
> >>> > > > We are running 5 zookeeper quorums now. On these 5 quorum
> servers,
> >>> we
> >>> > > also
> >>> > > > run datanode, tasktracker and regionserver.
> >>> > > > Now we have 6 disks per machine.
> >>> > > > If it is the disk IO saturation, is there anyway to configure
> >>> zookeeper
> >>> > > to
> >>> > > > write to a seperate disk which is not the same one used by
HDFS?
> >>> > > > Or shall we run zookeeper quorums on different nodes other
than
> >>> HDFS?
> >>> > > >
> >>> > > > Are HLogs generated by Regionservers? Would it alleviate
the
> issue
> >>> if
> >>> > we
> >>> > > use
> >>> > > > the first 14 for regionserver, and the rest of 5 for
> zookeeper?(In
> >>> that
> >>> > > > sense, the node running zookeeper quorum won't run regionserver)
> >>> > > >
> >>> > > > I am very appreciated for your comments.
> >>> > > >
> >>> > > > Best,
> >>> > > > zhenyu
> >>> > > >
> >>> > > >
> >>> > > >
> >>> > > > On Wed, Nov 11, 2009 at 2:30 PM, Jean-Daniel Cryans <
> >>> > jdcryans@apache.org
> >>> > > >wrote:
> >>> > > >
> >>> > > >> The problem seems to be that the IO is saturated. When
you see
> >>> this:
> >>> > > >>
> >>> > > >> #
> >>> > > >> 2009-11-11 04:28:10,308 WARN
> >>> > > >> org.apache.hadoop.hbase.regionserver.HLog: IPC Server
handler 9
> on
> >>> > > >> 60021 took 6819ms appending an edit to hlog; editcount=370
> >>> > > >> #
> >>> > > >> 2009-11-11 04:28:10,308 WARN
> >>> > > >> org.apache.hadoop.hbase.regionserver.HLog: IPC Server
handler 2
> on
> >>> > > >> 60021 took 4412ms appending an edit to hlog; editcount=371
> >>> > > >>
> >>> > > >> It's a sign that HDFS is slow. I guess that the zookeeper
quorum
> >>> > > >> members are on those same nodes using the same disks?
If so,
> >>> there's
> >>> > > >> the problem because Zookeeper needs to be able to commit
> >>> transactions
> >>> > > >> very fast and if your disks are already hogged then they
have to
> >>> wait
> >>> > > >> and you can get disconnections. Do you still have 19
quorum
> >>> members?
> >>> > > >> How many disks do you have per machine?
> >>> > > >>
> >>> > > >> Thx
> >>> > > >>
> >>> > > >> J-D
> >>> > > >>
> >>> > > >> On Wed, Nov 11, 2009 at 11:22 AM, Zhenyu Zhong <
> >>> > zhongresearch@gmail.com
> >>> > > >
> >>> > > >> wrote:
> >>> > > >> > Please take a look at the following regionserver
log.
> >>> > > >> > The error started to come out from 4:24am UTC to
4:29am UTC.
> >>> > > >> >
> >>> > > >> > http://pastebin.com/m3717d064
> >>> > > >> >
> >>> > > >> > Thanks in advance.
> >>> > > >> >
> >>> > > >> > Best,
> >>> > > >> > zhenyu
> >>> > > >> >
> >>> > > >> >
> >>> > > >> > On Wed, Nov 11, 2009 at 2:01 PM, Jean-Daniel Cryans
<
> >>> > > jdcryans@apache.org
> >>> > > >> >wrote:
> >>> > > >> >
> >>> > > >> >> Could you paste a bigger log trace (interested
to see at
> least
> >>> all
> >>> > > 300
> >>> > > >> >> lines before that) in a pastebin?
> >>> > > >> >>
> >>> > > >> >> Thx,
> >>> > > >> >>
> >>> > > >> >> J-D
> >>> > > >> >>
> >>> > > >> >> On Wed, Nov 11, 2009 at 10:56 AM, Zhenyu Zhong
<
> >>> > > zhongresearch@gmail.com
> >>> > > >> >
> >>> > > >> >> wrote:
> >>> > > >> >> > J-D,
> >>> > > >> >> >
> >>> > > >> >> > Thanks for the reply.
> >>> > > >> >> >
> >>> > > >> >> > The problem I have is one or more of the
regionservers
> >>> disconnect
> >>> > > from
> >>> > > >> >> the
> >>> > > >> >> > cluster.
> >>> > > >> >> >
> >>> > > >> >> > I checked the resource usage including
memory Heap usage
> for
> >>> > > >> >> regionserver,
> >>> > > >> >> > and found nothing suspicious. The regionserver
heap usage
> is
> >>> way
> >>> > > below
> >>> > > >> >> the
> >>> > > >> >> > maxHeap defined in jvm.
> >>> > > >> >> >
> >>> > > >> >> > So I checked zookeeper log, then I found
the following
> >>> > > >> >> > BufferUnderflowException, eventually it
leads to
> >>> SocketException:
> >>> > > >> >> Transport
> >>> > > >> >> > endpoint is not connected.
> >>> > > >> >> >
> >>> > > >> >> >
> >>> > > >> >> > I also checked the regionserver log. It
looks like the
> >>> > regionserver
> >>> > > >> tried
> >>> > > >> >> to
> >>> > > >> >> > connect to other zookeeper quorum server.
It connects
> >>> > successfully,
> >>> > > >> but
> >>> > > >> >> then
> >>> > > >> >> > it complained about SocketException: transport
endpoint is
> not
> >>> > > >> connected.
> >>> > > >> >> >
> >>> > > >> >> > So both zookeeper log and regionserver
log told me that the
> >>> > > transport
> >>> > > >> >> > endpoint is not connected. I don't know
why.
> >>> > > >> >> >
> >>> > > >> >> > I would be very appreciated if you could
point me to the
> right
> >>> > > >> direction.
> >>> > > >> >> >
> >>> > > >> >> > Best,
> >>> > > >> >> >
> >>> > > >> >> >
> >>> > > >> >> > Regionserver log:
> >>> > > >> >> > 2009-11-11 04:24:53,718 INFO
> org.apache.zookeeper.ClientCnxn:
> >>> > > >> Attempting
> >>> > > >> >> > connection to server superpyxis0018/192.168.100.132:2181
> >>> > > >> >> > 2009-11-11 04:24:53,718 INFO
> org.apache.zookeeper.ClientCnxn:
> >>> > > Priming
> >>> > > >> >> > connection to java.nio.channels.SocketChannel[connected
> >>> local=/
> >>> > > >> >> > 192.168.100.131:43065 remote=superpyxis0018/
> >>> 192.168.100.132:2181
> >>> > ]
> >>> > > >> >> > 2009-11-11 04:24:53,718 INFO
> org.apache.zookeeper.ClientCnxn:
> >>> > > Server
> >>> > > >> >> > connection successful
> >>> > > >> >> > 2009-11-11 04:24:53,768 INFO
> >>> > > >> >> > org.apache.hadoop.hbase.regionserver.HRegionServer:
Got
> >>> ZooKeeper
> >>> > > >> event,
> >>> > > >> >> > state: Disconnected, type: None, path:
null
> >>> > > >> >> > 2009-11-11 04:24:54,118 INFO
> org.apache.zookeeper.ClientCnxn:
> >>> > > >> Attempting
> >>> > > >> >> > connection to server superpyxis0017/192.168.100.131:2181
> >>> > > >> >> > 2009-11-11 04:24:54,118 INFO
> org.apache.zookeeper.ClientCnxn:
> >>> > > Priming
> >>> > > >> >> > connection to java.nio.channels.SocketChannel[connected
> >>> local=/
> >>> > > >> >> > 192.168.100.131:46903 remote=superpyxis0017/
> >>> 192.168.100.131:2181
> >>> > ]
> >>> > > >> >> > 2009-11-11 04:24:54,118 INFO
> org.apache.zookeeper.ClientCnxn:
> >>> > > Server
> >>> > > >> >> > connection successful
> >>> > > >> >> > 2009-11-11 04:24:54,118 WARN
> org.apache.zookeeper.ClientCnxn:
> >>> > > >> Exception
> >>> > > >> >> > closing session 0x24dfd90c810002 to
> >>> > > >> sun.nio.ch.SelectionKeyImpl@2dd78ccf
> >>> > > >> >> > java.io.IOException: Read error rc = -1
> >>> > > >> java.nio.DirectByteBuffer[pos=0
> >>> > > >> >> > lim=4 cap=4]
> >>> > > >> >> >        at
> >>> > > >> >> >
> >>> > >
> org.apache.zookeeper.ClientCnxn$SendThread.doIO(ClientCnxn.java:701)
> >>> > > >> >> >        at
> >>> > > >> >> >
> >>> > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:945)
> >>> > > >> >> > 2009-11-11 04:24:54,118 WARN
> org.apache.zookeeper.ClientCnxn:
> >>> > > Ignoring
> >>> > > >> >> > exception during shutdown input
> >>> > > >> >> > java.net.SocketException: Transport endpoint
is not
> connected
> >>> > > >> >> >        at sun.nio.ch.SocketChannelImpl.shutdown(Native
> Method)
> >>> > > >> >> >        at
> >>> > > >> >> >
> >>> > >
> sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:640)
> >>> > > >> >> >        at
> >>> > > >> sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
> >>> > > >> >> >        at
> >>> > > >> >> >
> >>> > > >>
> >>> >
> org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:999)
> >>> > > >> >> >        at
> >>> > > >> >> >
> >>> > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
> >>> > > >> >> >
> >>> > > >> >> >
> >>> > > >> >> >
> >>> > > >> >> >
> >>> > > >> >> >
> >>> > > >> >> > On Wed, Nov 11, 2009 at 1:40 PM, Jean-Daniel
Cryans <
> >>> > > >> jdcryans@apache.org
> >>> > > >> >> >wrote:
> >>> > > >> >> >
> >>> > > >> >> >> I'm really not sure exactly what the
situation is with the
> >>> > > >> >> >> java.nio.BufferUnderflowException,
but what do you mean by
> >>> > > >> >> >> "regionserver disconnection"? Could
you give more details?
> >>> > > >> >> >>
> >>> > > >> >> >> Thx,
> >>> > > >> >> >>
> >>> > > >> >> >> J-D
> >>> > > >> >> >>
> >>> > > >> >> >> On Wed, Nov 11, 2009 at 10:34 AM, Zhenyu
Zhong <
> >>> > > >> zhongresearch@gmail.com
> >>> > > >> >> >
> >>> > > >> >> >> wrote:
> >>> > > >> >> >> > I searched around and found HBASE-1645
"HBase could be a
> >>> > little
> >>> > > >> more
> >>> > > >> >> >> dainty
> >>> > > >> >> >> > when zk is pulled out from under
it"
> >>> > > >> >> >> >
> >>> > > >> >> >> > I am wondering whether my problem
is related to this
> >>> > HBase-1645.
> >>> > > Or
> >>> > > >> >> >> probably
> >>> > > >> >> >> > has nothing to do with it?
> >>> > > >> >> >> >
> >>> > > >> >> >> > thanks
> >>> > > >> >> >> >
> >>> > > >> >> >> >
> >>> > > >> >> >> > On Wed, Nov 11, 2009 at 12:02
PM, Zhenyu Zhong <
> >>> > > >> >> zhongresearch@gmail.com
> >>> > > >> >> >> >wrote:
> >>> > > >> >> >> >
> >>> > > >> >> >> >> Hi,
> >>> > > >> >> >> >>
> >>> > > >> >> >> >> I have been monitoring the
system resources such as
> memory
> >>> > Heap
> >>> > > >> usage
> >>> > > >> >> >> for
> >>> > > >> >> >> >> Regionserver, load average,
network bandwidth, etc.
> >>> > > >> >> >> >>
> >>> > > >> >> >> >> I experienced a disconnection
last night. When I
> checked
> >>> the
> >>> > > >> memory
> >>> > > >> >> Heap
> >>> > > >> >> >> >> for Regionserver, it was 2336
which is way below the
> max
> >>> Heap
> >>> > > >> 4096. I
> >>> > > >> >> >> don't
> >>> > > >> >> >> >> think it is Regionserver problem.
The requests that the
> >>> > > >> regionserver
> >>> > > >> >> got
> >>> > > >> >> >> was
> >>> > > >> >> >> >> about 126 which doesn't seem
to be high. The load
> average
> >>> is
> >>> > > kind
> >>> > > >> of
> >>> > > >> >> >> high
> >>> > > >> >> >> >> >100. (but I saw disconnections
while the load average
> is
> >>> > > around
> >>> > > >> 30).
> >>> > > >> >> >> The
> >>> > > >> >> >> >> bandwidth is not a problem.
> >>> > > >> >> >> >>
> >>> > > >> >> >> >> However, I found error messages
from the zookeeper.
> Please
> >>> > see
> >>> > > the
> >>> > > >> >> >> >> following error messages.
There are some
> >>> > > >> >> >> >> BufferUnderflowException error,
IOException error,etc.
> >>> > > >> >> >> >> May I ask what might be the
causes that generate these
> >>> error
> >>> > > >> >> messages?
> >>> > > >> >> >> >>
> >>> > > >> >> >> >> Many thanks
> >>> > > >> >> >> >> zhenyu
> >>> > > >> >> >> >>
> >>> > > >> >> >> >>
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> >>> > > org.apache.zookeeper.server.Request:
> >>> > > >> >> >> Ignoring
> >>> > > >> >> >> >> exception during toString
> >>> > > >> >> >> >> java.nio.BufferUnderflowException
> >>> > > >> >> >> >>         at
> >>> > java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
> >>> > > >> >> >> >>         at java.nio.ByteBuffer.get(ByteBuffer.java:675)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >>
> >>> org.apache.zookeeper.server.Request.toString(Request.java:199)
> >>> > > >> >> >> >>         at java.lang.String.valueOf(String.java:2827)
> >>> > > >> >> >> >>         at
> >>> > > java.lang.StringBuilder.append(StringBuilder.java:115)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.zookeeper.server.quorum.CommitProcessor.processRequest(CommitProcessor.java:167)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.zookeeper.server.quorum.FollowerRequestProcessor.run(FollowerRequestProcessor.java:68)
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> >>> > > >> >> org.apache.zookeeper.server.NIOServerCnxn:
> >>> > > >> >> >> >> Exception causing close of
session 0x424dfd908c50009
> >>> > > >> >> >> >> due to java.io.IOException:
Read error
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 DEBUG
> >>> > > >> >> org.apache.zookeeper.server.NIOServerCnxn:
> >>> > > >> >> >> >> IOException stack trace
> >>> > > >> >> >> >> java.io.IOException: Read
error
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >>
> >>> > >
> org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:372)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:221)
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 DEBUG
> >>> > > >> >> >> >> org.apache.zookeeper.server.quorum.CommitProcessor:
> >>> > Processing
> >>> > > >> >> request::
> >>> > > >> >> >> >> sessionid:0x424dfd908c50009
type:setWatches
> >>> > > >> cxid:0xfffffffffffffff8
> >>> > > >> >> >> >> zxid:0xfffffffffffffffe txntype:unknown
n/a
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> >>> > > org.apache.zookeeper.server.Request:
> >>> > > >> >> >> Ignoring
> >>> > > >> >> >> >> exception during toString
> >>> > > >> >> >> >> java.nio.BufferUnderflowException
> >>> > > >> >> >> >>         at
> >>> > java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
> >>> > > >> >> >> >>         at java.nio.ByteBuffer.get(ByteBuffer.java:675)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >>
> >>> org.apache.zookeeper.server.Request.toString(Request.java:199)
> >>> > > >> >> >> >>         at java.lang.String.valueOf(String.java:2827)
> >>> > > >> >> >> >>         at
> >>> > > java.lang.StringBuilder.append(StringBuilder.java:115)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:74)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:73)
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 DEBUG
> >>> > > >> >> >> >> org.apache.zookeeper.server.FinalRequestProcessor:
> >>> Processing
> >>> > > >> >> request::
> >>> > > >> >> >> >> sessionid:0x424dfd908c50009
type:setWatches
> >>> > > >> cxid:0xfffffffffffffff8
> >>> > > >> >> >> >> zxid:0xfffffffffffffffe txntype:unknown
n/a
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> >>> > > org.apache.zookeeper.server.Request:
> >>> > > >> >> >> Ignoring
> >>> > > >> >> >> >> exception during toString
> >>> > > >> >> >> >> java.nio.BufferUnderflowException
> >>> > > >> >> >> >>         at
> >>> > java.nio.HeapByteBuffer.get(HeapByteBuffer.java:127)
> >>> > > >> >> >> >>         at java.nio.ByteBuffer.get(ByteBuffer.java:675)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >>
> >>> org.apache.zookeeper.server.Request.toString(Request.java:199)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >>
> >>> org.apache.log4j.or.DefaultRenderer.doRender(DefaultRenderer.java:36)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > org.apache.log4j.or.RendererMap.findAndRender(RendererMap.java:80)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.log4j.spi.LoggingEvent.getRenderedMessage(LoggingEvent.java:362)
> >>> > > >> >> >> >> at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.log4j.helpers.PatternParser$BasicPatternConverter.convert(PatternParser.java:403)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.log4j.helpers.PatternConverter.format(PatternConverter.java:65)
> >>> > > >> >> >> >>         at
> >>> > > >> >> org.apache.log4j.PatternLayout.format(PatternLayout.java:502)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > org.apache.log4j.WriterAppender.subAppend(WriterAppender.java:302)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.log4j.DailyRollingFileAppender.subAppend(DailyRollingFileAppender.java:359)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >>
> >>> org.apache.log4j.WriterAppender.append(WriterAppender.java:160)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >>
> >>> org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
> >>> > > >> >> >> >>         at
> >>> > > >> org.apache.log4j.Category.callAppenders(Category.java:206)
> >>> > > >> >> >> >>         at
> >>> > > org.apache.log4j.Category.forcedLog(Category.java:391)
> >>> > > >> >> >> >>         at
> >>> org.apache.log4j.Category.debug(Category.java:260)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.zookeeper.server.FinalRequestProcessor.processRequest(FinalRequestProcessor.java:147)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.zookeeper.server.quorum.CommitProcessor.run(CommitProcessor.java:73)
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 WARN
> >>> > > org.apache.zookeeper.server.Request:
> >>> > > >> >> >> Ignoring
> >>> > > >> >> >> >> exception during toString
> >>> > > >> >> >> >> sessionid:0x424dfd908c50009
type:setWatches
> >>> > > >> cxid:0xfffffffffffffff8
> >>> > > >> >> >> >> zxid:0xfffffffffffffffe txntype:unknown
n/a
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 INFO
> >>> > > >> >> org.apache.zookeeper.server.NIOServerCnxn:
> >>> > > >> >> >> >> closing session:0x424dfd908c50009
NIOServerCnxn:
> >>> > > >> >> >> >> java.nio.channels.SocketChannel[connected
local=/
> >>> > > >> >> 192.168.100.131:2181
> >>> > > >> >> >> remote=/
> >>> > > >> >> >> >> 192.168.100.131:35500]
> >>> > > >> >> >> >> 2009-11-11 04:29:00,810 DEBUG
> >>> > > >> >> org.apache.zookeeper.server.NIOServerCnxn:
> >>> > > >> >> >> >> ignoring exception during
input shutdown
> >>> > > >> >> >> >> java.net.SocketException:
Transport endpoint is not
> >>> connected
> >>> > > >> >> >> >>         at sun.nio.ch.SocketChannelImpl.shutdown(Native
> >>> > Method)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >>
> >>> > >
> sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:640)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >>
> >>> sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >>
> >>> > >
> >>> org.apache.zookeeper.server.NIOServerCnxn.close(NIOServerCnxn.java:848)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >>
> >>> > >
> org.apache.zookeeper.server.NIOServerCnxn.doIO(NIOServerCnxn.java:498)
> >>> > > >> >> >> >>         at
> >>> > > >> >> >> >>
> >>> > > >> >> >>
> >>> > > >> >>
> >>> > > >>
> >>> > >
> >>> >
> >>>
> org.apache.zookeeper.server.NIOServerCnxn$Factory.run(NIOServerCnxn.java:221)
> >>> > > >> >> >> >>
> >>> > > >> >> >> >
> >>> > > >> >> >>
> >>> > > >> >> >
> >>> > > >> >>
> >>> > > >> >
> >>> > > >>
> >>> > > >
> >>> > >
> >>> >
> >>>
> >>
> >>
> >
>

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