On Thu, Nov 12, 2009 at 10:54 AM, Zhenyu Zhong <[email protected]>wrote:
> Sorry, there was a typo in my email. But it is 10 minutes that I set in the > hbase-site.xml. > > Please see the link. > http://pastebin.com/m564c51bc > > Very much appreciated. > zhenyu > And you restarted after making the change? St.Ack > > On Thu, Nov 12, 2009 at 1:42 PM, Jean-Daniel Cryans <[email protected] > >wrote: > > > Usually if it was 10 minutes we would see sleepers complaining they > > slept for way too long. In the logs I can see a 1 minute pause but not > > 10 minutes because of the ZK debug. Are you sure you don't have a > > typo? Like what you just wrote is not valid, you wrote > > zookeeper.session.timout instead of zookeeper.session.timeout. Are you > > sure it's distributed over the cluster? Could you pastebin > > hbase-site.xml? > > > > Thx, > > > > J-D > > > > On Thu, Nov 12, 2009 at 10:28 AM, Zhenyu Zhong <[email protected]> > > wrote: > > > 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 < > [email protected] > > >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.selectionkeyi...@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 < > [email protected]> > > >> 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 < > > [email protected] > > >> >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 <[email protected]> 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.selectionkeyi...@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 < > > >> [email protected] > > >> >>> >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 < > > >> >>> [email protected] > > >> >>> > >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 < > > >> >>> [email protected]> > > >> >>> > > 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 < > > >> >>> > [email protected] > > >> >>> > > >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 < > > >> >>> > [email protected] > > >> >>> > > > > > >> >>> > > >> 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 < > > >> >>> > > [email protected] > > >> >>> > > >> >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 < > > >> >>> > > [email protected] > > >> >>> > > >> > > > >> >>> > > >> >> 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.selectionkeyi...@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 < > > >> >>> > > >> [email protected] > > >> >>> > > >> >> >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 < > > >> >>> > > >> [email protected] > > >> >>> > > >> >> > > > >> >>> > > >> >> >> 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 < > > >> >>> > > >> >> [email protected] > > >> >>> > > >> >> >> >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) > > >> >>> > > >> >> >> >> > > >> >>> > > >> >> >> > > > >> >>> > > >> >> >> > > >> >>> > > >> >> > > > >> >>> > > >> >> > > >> >>> > > >> > > > >> >>> > > >> > > >> >>> > > > > > >> >>> > > > > >> >>> > > > >> >>> > > >> >> > > >> >> > > >> > > > >> > > > > > >
