BTW, if a regionserver disconnect, would a mannually restart on this particular regionserver helps ?
Best, zhenyu On Thu, Oct 29, 2009 at 6:26 PM, Zhenyu Zhong <[email protected]>wrote: > Stack, > > I am very appreciated for your help. > Yes, I am using cacti to monitor the loads etc. I also upped my zk seesion > timeout to 600sec. > May I ask what the default connection timeout for a zookeeper client to > connect to a quorum? > > thanks > zhenyu > > > > On Thu, Oct 29, 2009 at 6:06 PM, stack <[email protected]> wrote: > >> If it stole machine resources, yeah, it could. Do you have anything to >> watch your cluster with in place? Ganglia or some such so you can watch >> the >> loadings? Is the machine with the RS that is going down swapping? You >> could try upping your zk session timeout in your hbase cluster. >> St.Ack >> >> On Thu, Oct 29, 2009 at 3:00 PM, Zhenyu Zhong <[email protected] >> >wrote: >> >> > Anything that possibly gets started is another MR job working on other >> > dataset in the same time as this test was running. So some node might >> be >> > under heavy loads. >> > I am wondering whether that would cause the connection timeout. >> > >> > thanks >> > zhenyu >> > >> > >> > >> > On Thu, Oct 29, 2009 at 5:32 PM, stack <[email protected]> wrote: >> > >> > > On Thu, Oct 29, 2009 at 2:23 PM, Zhenyu Zhong < >> [email protected] >> > > >wrote: >> > > >> > > > I have 19 quorum members now. >> > > > >> > > > Thats too many. Have 3 or maybe 5. See zk site for rationale. >> > > >> > > >> > > >> > > > When I did test on loading data to two columnfamilies of one table >> in >> > > HBase >> > > > using two seperate MR jobs, I lost my regionserver and the test >> failed. >> > > > >> > > > Does HBase allow such table update operation? >> > > > >> > > > The errors I got while I lost my regionserver is: >> > > > 2009-10-29 21:09:34,705 INFO >> org.apache.hadoop.hbase.regionserver.HLog: >> > > > Roll >> > > > /hbase/.logs/YYYY,60021,1256849619429/hlog.d >> > > > at.1256849620029, entries=271911, calcsize=63754142, >> filesize=33975611. >> > > New >> > > > hlog /hbase/.logs/YYYY,60021,1256849619429/hl >> > > > og.dat.1256850574705 >> > > > 2009-10-29 21:09:50,322 WARN >> > > > org.apache.hadoop.hbase.regionserver.HRegionServer: Attempt=1 >> > > > org.apache.hadoop.hbase.Leases$LeaseStillHeldException >> > > > >> > > >> > > >> > > You have read the 'Getting Started' and made the necessary changes to >> > > filedescriptors and xceiver count? >> > > >> > > You will see above message after a regionserver has restarted and >> tries >> > to >> > > go back to the master (what hbase is this? I think you said it >> 0.20.x). >> > > >> > > >> > > >> > > >> > > > java.io.IOException: TIMED OUT >> > > > at >> > > > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:906) >> > > > 2009-10-29 21:09:50,873 INFO >> > > > org.apache.hadoop.hbase.regionserver.HRegionServer: Got ZooKeeper >> > event, >> > > > state: Disconnected, type: None, path: >> > > > null >> > > > >> > > >> > > This is timeout against zk. You've lost your session. The RS will go >> > > down. The connection to zk is basic to hbase. Something is up. In >> the >> > > past others have reported things like incorrect bios settings on disks >> > that >> > > have made the disks run slow or just something up with the networking. >> > Can >> > > you check all is healthy? You seem to be having too many issues for >> such >> > a >> > > small loading with such a large cluster. >> > > >> > > St.Ack >> > > >> > > >> > > >> > > > >> > > > >> > > > >> > > > >> > > > On Thu, Oct 29, 2009 at 2:51 PM, stack <[email protected]> wrote: >> > > > >> > > > > On Thu, Oct 29, 2009 at 11:46 AM, Zhenyu Zhong < >> > > [email protected] >> > > > > >wrote: >> > > > > >> > > > > > FYI >> > > > > > It looks like increasing the number of Zookeeper Quorums can >> solve >> > > the >> > > > > > following error message : org.apache.hadoop.hbase. >> > > > > > client.NoServerForRegionException: Timed out trying to locate >> root >> > > > region >> > > > > > at >> > > > > > org.apache.hadoop.hbase. >> > > > > > >> > > > > > You mean quorum members? How many do you have now? >> > > > > >> > > > > >> > > > > >> > > > > > Now I am running Zookeeper quorum on each node I have. >> > > > > > However, I am still having issues about losing regionserver. >> > > > > > >> > > > > > Whats in the logs? >> > > > > >> > > > > >> > > > > >> > > > > >> > > > > > Is there a way to browse the Znode in zookeeper? >> > > > > > >> > > > > > >> > > > > Type 'zk' in the hbase shell. >> > > > > >> > > > > You can get to the zk shell from hbase shell. You so things like: >> > > > > >> > > > > > zk "ls /" >> > > > > >> > > > > (Yes, quotes needed). >> > > > > >> > > > > St.Ack >> > > > > >> > > > > >> > > > > >> > > > > > thanks >> > > > > > zhenyu >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > >> > > > > > On Wed, Oct 28, 2009 at 3:40 PM, Zhenyu Zhong < >> > > [email protected] >> > > > > > >wrote: >> > > > > > >> > > > > > > JG, >> > > > > > > >> > > > > > > >> > > > > > > Thanks a lot for the tips. >> > > > > > > I set the HEAP to 4GB and GC options as >> -XX:ParallelGCThreads=8 >> > > > > > > -XX:+UseConcMarkSweepGC. >> > > > > > > >> > > > > > > I checked the logs in my Master an RS and found the following >> > > errors. >> > > > > > > Basically, master got exception error while scanning ROOT, >> then >> > the >> > > > > ROOT >> > > > > > > region was offline and unset. Thus the regionserver can't get >> > > > > > > NotservingRegion errors. >> > > > > > > >> > > > > > > In the master: >> > > > > > > 2009-10-28 19:00:30,591 INFO >> > > > > org.apache.hadoop.hbase.master.BaseScanner: >> > > > > > > RegionManager.rootScanner scanning meta region {server: x.x.x. >> > > > > > > x:60021, regionname: -ROOT-,,0, startKey: <>} >> > > > > > > 2009-10-28 19:00:30,591 WARN >> > > > > org.apache.hadoop.hbase.master.BaseScanner: >> > > > > > > Scan ROOT region >> > > > > > > java.io.IOException: Call to /x.x.x.x:60021 failed on local >> > > > exception: >> > > > > > > java.io.EOFException >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.ipc.HBaseClient.wrapException(HBaseClient.java:757) >> > > > > > > at >> > > > > > > >> > org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:727) >> > > > > > > at >> > > > > > > >> > > > >> org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:328) >> > > > > > > at $Proxy1.openScanner(Unknown Source) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.master.BaseScanner.scanRegion(BaseScanner.java:160) >> > > > > > > at >> > > > > > > >> > > > > >> > > >> org.apache.hadoop.hbase.master.RootScanner.scanRoot(RootScanner.java:54) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.master.RootScanner.maintenanceScan(RootScanner.java:79) >> > > > > > > at >> > > > > > > >> > > > >> org.apache.hadoop.hbase.master.BaseScanner.chore(BaseScanner.java:136) >> > > > > > > at org.apache.hadoop.hbase.Chore.run(Chore.java:68) >> > > > > > > Caused by: java.io.EOFException >> > > > > > > at >> > > java.io.DataInputStream.readInt(DataInputStream.java:375) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.receiveResponse(HBaseClient.java:504) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.run(HBaseClient.java:448) >> > > > > > > 2009-10-28 19:00:30,591 INFO >> > > > > org.apache.hadoop.hbase.master.BaseScanner: >> > > > > > > RegionManager.metaScanner scanning meta region {server: x.x.x. >> > > > > > > x:60021, regionname: .META.,,1, startKey: <>} >> > > > > > > 2009-10-28 19:00:30,591 WARN >> > > > > org.apache.hadoop.hbase.master.BaseScanner: >> > > > > > > Scan one META region: {server: x.x.x.x:60021, regionname: .M >> > > > > > > ETA.,,1, startKey: <>} >> > > > > > > java.net.ConnectException: Connection refused >> > > > > > > at sun.nio.ch.SocketChannelImpl.checkConnect(Native >> > Method) >> > > > > > > at >> > > > > > > >> > > > >> sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:574) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206) >> > > > > > > at >> > > org.apache.hadoop.net.NetUtils.connect(NetUtils.java:404) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:308) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:831) >> > > > > > > at >> > > > > > > >> > org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:712) >> > > > > > > at >> > > > > > > >> > > > >> org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:328) >> > > > > > > at $Proxy1.openScanner(Unknown Source) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.master.BaseScanner.scanRegion(BaseScanner.java:160) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.master.MetaScanner.scanOneMetaRegion(MetaScanner.java:73) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.master.MetaScanner.maintenanceScan(MetaScanner.java:129) >> > > > > > > at >> > > > > > > >> > > > >> org.apache.hadoop.hbase.master.BaseScanner.chore(BaseScanner.java:136) >> > > > > > > at org.apache.hadoop.hbase.Chore.run(Chore.java:68) >> > > > > > > 2009-10-28 19:00:30,591 INFO >> > > > > org.apache.hadoop.hbase.master.BaseScanner: >> > > > > > > All 1 .META. region(s) scanned >> > > > > > > 2009-10-28 19:00:31,395 INFO >> > > > > > org.apache.hadoop.hbase.master.ServerManager: >> > > > > > > Removing server's info YYYY,60021,125675547057 >> > > > > > > 0 >> > > > > > > 2009-10-28 19:00:31,395 INFO >> > > > > > org.apache.hadoop.hbase.master.RegionManager: >> > > > > > > Offlined ROOT server: x.x.x.x:60021 >> > > > > > > >> > > > > > > 2009-10-28 19:00:31,395 INFO >> > > > > > org.apache.hadoop.hbase.master.RegionManager: >> > > > > > > -ROOT- region unset (but not set to be reassigned) >> > > > > > > 2009-10-28 19:00:31,395 INFO >> > > > > > org.apache.hadoop.hbase.master.RegionManager: >> > > > > > > ROOT inserted into regionsInTransition >> > > > > > > 2009-10-28 19:00:31,395 INFO >> > > > > > org.apache.hadoop.hbase.master.RegionManager: >> > > > > > > Offlining META region: {server: x.x.x.x:60021, regionname: >> > > .META.,,1, >> > > > > > > startKey: <>} >> > > > > > > 2009-10-28 19:00:31,395 INFO >> > > > > > org.apache.hadoop.hbase.master.RegionManager: >> > > > > > > META region removed from onlineMetaRegions >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > On the regionserver: >> > > > > > > 2009-10-28 18:51:14,578 INFO >> > > > > > > org.apache.hadoop.hbase.regionserver.HRegionServer: >> > > MSG_REGION_OPEN: >> > > > > > > test,,1256755871065 >> > > > > > > 2009-10-28 18:51:14,578 INFO >> > > > > > > org.apache.hadoop.hbase.regionserver.HRegionServer: Worker: >> > > > > > MSG_REGION_OPEN: >> > > > > > > test,,1256755871065 >> > > > > > > 2009-10-28 18:51:14,578 INFO >> > > > > > org.apache.hadoop.hbase.regionserver.HRegion: >> > > > > > > region test,,1256755871065/796855017 available; sequence id is >> > > > 10013291 >> > > > > > > 2009-10-28 18:51:14,578 INFO >> > > > > > org.apache.hadoop.hbase.regionserver.HRegion: >> > > > > > > Starting compaction on region test,,1256755871065 >> > > > > > > 2009-10-28 18:51:18,388 DEBUG org.apache.zookeeper.ClientCnxn: >> > Got >> > > > ping >> > > > > > > response for sessionid:0x249c76021d0001 after 0ms >> > > > > > > 2009-10-28 18:51:19,341 ERROR >> > > > > > > org.apache.hadoop.hbase.regionserver.HRegionServer: >> > > > > > > org.apache.hadoop.hbase.NotServingRegionException: >> > > > test,,1256754924503 >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.regionserver.HRegionServer.getRegion(HRegionServer.java:2307) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:1784) >> > > > > > > at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown >> > > > Source) >> > > > > > > at >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) >> > > > > > > at java.lang.reflect.Method.invoke(Method.java:597) >> > > > > > > at >> > > > > > > >> > org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:648) >> > > > > > > at >> > > > > > > >> > > > > >> > > >> org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:915) >> > > > > > > 2009-10-28 18:51:19,341 INFO >> org.apache.hadoop.ipc.HBaseServer: >> > IPC >> > > > > > Server >> > > > > > > handler 0 on 60021, call get([...@21fefd80, row=1053508149, >> > > > > maxVersions=1, >> > > > > > > timeRange=[0,9223372036854775807), >> > > > families={(family=email_ip_activity, >> > > > > > > columns=ALL}) from x.x.x.x:54669: error: >> > > > > > > org.apache.hadoop.hbase.NotServingRegionException: >> > > > test,,1256754924503 >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > >> > > > > > > On Wed, Oct 28, 2009 at 2:56 PM, Jonathan Gray < >> > [email protected]> >> > > > > > wrote: >> > > > > > > >> > > > > > >> These client error messages are not particular descriptive as >> to >> > > the >> > > > > > root >> > > > > > >> cause (they are fatal errors, or close to it). >> > > > > > >> >> > > > > > >> What is going on in your regionservers when these errors >> happen? >> > > > > Check >> > > > > > >> the master and RS logs. >> > > > > > >> >> > > > > > >> Also, you definitely do not want 19 zookeeper nodes. Reduce >> > that >> > > to >> > > > 3 >> > > > > > or >> > > > > > >> 5 max. >> > > > > > >> >> > > > > > >> What is the hardware you are using for these nodes, and what >> > > > settings >> > > > > do >> > > > > > >> you have for heap/GC? >> > > > > > >> >> > > > > > >> JG >> > > > > > >> >> > > > > > >> >> > > > > > >> Zhenyu Zhong wrote: >> > > > > > >> >> > > > > > >>> Stack, >> > > > > > >>> >> > > > > > >>> Thank you very much for your comments. >> > > > > > >>> I am running a cluster with 20 nodes. I set 19 as both >> > > regionserver >> > > > > and >> > > > > > >>> zookeeper quorums. >> > > > > > >>> The versions I am using are Hadoop0.20.1 and HBase0.20.1. >> > > > > > >>> I started with an empty table and try to load 200 million >> > records >> > > > > into >> > > > > > >>> that >> > > > > > >>> empty table. >> > > > > > >>> There is a key in each record. Logically, in my MR program, >> > > during >> > > > > the >> > > > > > >>> setup, I opened an HTable, in my mapper, I fetch the record >> > from >> > > > > HTable >> > > > > > >>> via >> > > > > > >>> key in the record, then make some changes to the columns and >> > > update >> > > > > > that >> > > > > > >>> row >> > > > > > >>> back to HTable through TableOutputFormat by passing a put. >> > There >> > > is >> > > > > no >> > > > > > >>> reduce tasks involved here. (Though it is unnecessary to >> fetch >> > > row >> > > > > > from >> > > > > > >>> an >> > > > > > >>> empty table, I just intended to do that) >> > > > > > >>> >> > > > > > >>> Additionally, when I reduced the number of regionservers and >> > > number >> > > > > of >> > > > > > >>> zookeeper quorums. >> > > > > > >>> I had different errors: >> > > > > > >>> org.apache.hadoop.hbase.client.NoServerForRegionException: >> > Timed >> > > > out >> > > > > > >>> trying >> > > > > > >>> to locate root region at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:929) >> > > > > > >>> at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:580) >> > > > > > >>> at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.relocateRegion(HConnectionManager.java:562) >> > > > > > >>> at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:693) >> > > > > > >>> at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:589) >> > > > > > >>> at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.relocateRegion(HConnectionManager.java:562) >> > > > > > >>> at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:693) >> > > > > > >>> at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:593) >> > > > > > >>> at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:556) >> > > > > > >>> at org.apache.hadoop.hbase.client.HTable.(HTable.java:127) >> at >> > > > > > >>> org.apache.hadoop.hbase.client.HTable.(HTable.java:105) at >> > > > > > >>> >> > > > > > >>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.mapreduce.TableOutputFormat.getRecordWriter(TableOutputFormat.java:116) >> > > > > > >>> at >> > > org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:573) >> > > > at >> > > > > > >>> org.apache.hadoop.mapred.MapTask.run(MapTask.java:305) at >> > > > > > >>> org.apache.hadoop.mapred.Child.main(Child.java:170) >> > > > > > >>> >> > > > > > >>> Many thanks in advance. >> > > > > > >>> zhenyu >> > > > > > >>> >> > > > > > >>> >> > > > > > >>> >> > > > > > >>> >> > > > > > >>> On Wed, Oct 28, 2009 at 12:39 PM, stack <[email protected]> >> > > wrote: >> > > > > > >>> >> > > > > > >>> Whats your cluster topology? How many nodes involved? >> When >> > you >> > > > see >> > > > > > the >> > > > > > >>>> below message, how many regions in your table? How are you >> > > > loading >> > > > > > your >> > > > > > >>>> table? >> > > > > > >>>> Thanks, >> > > > > > >>>> St.Ack >> > > > > > >>>> >> > > > > > >>>> On Wed, Oct 28, 2009 at 7:45 AM, Zhenyu Zhong < >> > > > > > [email protected] >> > > > > > >>>> >> > > > > > >>>>> wrote: >> > > > > > >>>>> Nitay, >> > > > > > >>>>> >> > > > > > >>>>> I am very appreciated. >> > > > > > >>>>> >> > > > > > >>>>> As Ryan suggested, I increased the zookeeper session >> timeout >> > to >> > > > > > >>>>> 40seconds >> > > > > > >>>>> along with the GC options -XX:ParallelGCThreads=8 >> > > > > > >>>>> >> > > > > > >>>> -XX:+UseConcMarkSweepGC >> > > > > > >>>> >> > > > > > >>>>> in place. I set the Heapsize to 4GB. I also set the >> > > > > vm.swappiness=0. >> > > > > > >>>>> >> > > > > > >>>>> However it still ran into problem. Please find the >> following >> > > > > errors. >> > > > > > >>>>> >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Trying >> > > > to >> > > > > > >>>>> contact region server x.x.x.x:60021 for region >> > > > > > >>>>> YYYY,117.99.7.153,1256396118155, row '1170491458', but >> failed >> > > > after >> > > > > > 10 >> > > > > > >>>>> attempts. >> > > > > > >>>>> Exceptions: >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> org.apache.hadoop.hbase.client.RetriesExhaustedException: >> > > Failed >> > > > > > >>>>> setting up proxy to /x.x.x.x:60021 after attempts=1 >> > > > > > >>>>> >> > > > > > >>>>> at >> > > > > > >>>>> >> > > > > > >>>>> >> > > > > > >> > > > > >> > > > >> > > >> > >> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getRegionServerWithRetries(HConnectionManager.java:1001) >> > > > > > >>>> >> > > > > > >>>>> at >> > > > org.apache.hadoop.hbase.client.HTable.get(HTable.java:413) >> > > > > > >>>>> >> > > > > > >>>>> >> > > > > > >>>>> The input file is about 10GB around 200million rows of >> data. >> > > > > > >>>>> This load doesn't seem too large. However this kind of >> errors >> > > > keep >> > > > > > >>>>> >> > > > > > >>>> popping >> > > > > > >>>> >> > > > > > >>>>> up. >> > > > > > >>>>> >> > > > > > >>>>> Does Regionserver need to be deployed to dedicated >> machines? >> > > > > > >>>>> Does Zookeeper need to be deployed to dedicated machines >> as >> > > well? >> > > > > > >>>>> >> > > > > > >>>>> Best, >> > > > > > >>>>> zhenyu >> > > > > > >>>>> >> > > > > > >>>>> >> > > > > > >>>>> >> > > > > > >>>>> On Wed, Oct 28, 2009 at 1:37 AM, nitay <[email protected]> >> > > wrote: >> > > > > > >>>>> >> > > > > > >>>>> Hi Zhenyu, >> > > > > > >>>>>> >> > > > > > >>>>>> Sorry for the delay. I started working on this a while >> back, >> > > > > before >> > > > > > I >> > > > > > >>>>>> >> > > > > > >>>>> left >> > > > > > >>>>> >> > > > > > >>>>>> my job for another company. Since then I haven't had much >> > time >> > > > to >> > > > > > work >> > > > > > >>>>>> >> > > > > > >>>>> on >> > > > > > >>>> >> > > > > > >>>>> HBase unfortunately :(. I'll try to dig up what I had and >> see >> > > > what >> > > > > > >>>>>> >> > > > > > >>>>> shape >> > > > > > >>>> >> > > > > > >>>>> it's in and update you. >> > > > > > >>>>>> >> > > > > > >>>>>> Cheers, >> > > > > > >>>>>> -n >> > > > > > >>>>>> >> > > > > > >>>>>> >> > > > > > >>>>>> On Oct 27, 2009, at 3:38 PM, Ryan Rawson wrote: >> > > > > > >>>>>> >> > > > > > >>>>>> Sorry I must have mistyped, I meant to say "40 seconds". >> > You >> > > > can >> > > > > > >>>>>> >> > > > > > >>>>>>> still see multi-second pauses at times, so you need to >> give >> > > > > > yourself >> > > > > > >>>>>>> a >> > > > > > >>>>>>> bigger buffer. >> > > > > > >>>>>>> >> > > > > > >>>>>>> The parallel threads argument should not be necessary, >> but >> > > you >> > > > do >> > > > > > >>>>>>> need >> > > > > > >>>>>>> the UseConcMarkSweepGC flag as well. >> > > > > > >>>>>>> >> > > > > > >>>>>>> Let us know how it goes! >> > > > > > >>>>>>> -ryan >> > > > > > >>>>>>> >> > > > > > >>>>>>> >> > > > > > >>>>>>> On Tue, Oct 27, 2009 at 3:19 PM, Zhenyu Zhong < >> > > > > > >>>>>>> >> > > > > > >>>>>> [email protected]> >> > > > > > >>>> >> > > > > > >>>>> wrote: >> > > > > > >>>>>>> >> > > > > > >>>>>>> Ryan, >> > > > > > >>>>>>>> I am very appreciated for your feedbacks. >> > > > > > >>>>>>>> I have set the zookeeper.session.timeout to seconds >> which >> > is >> > > > way >> > > > > > >>>>>>>> >> > > > > > >>>>>>> higher >> > > > > > >>>> >> > > > > > >>>>> than >> > > > > > >>>>>>>> 40ms. >> > > > > > >>>>>>>> In the same time, the -Xms is set to 4GB, which should >> be >> > > > > > >>>>>>>> sufficient. >> > > > > > >>>>>>>> I also tried GC options like >> > > > > > >>>>>>>> >> > > > > > >>>>>>>> -XX:ParallelGCThreads=8 >> > > > > > >>>>>>>> -XX:+UseConcMarkSweepGC >> > > > > > >>>>>>>> >> > > > > > >>>>>>>> I even set the vm.swappiness=0 >> > > > > > >>>>>>>> >> > > > > > >>>>>>>> However, I still came across the problem that a >> > RegionServer >> > > > > > >>>>>>>> shutdown >> > > > > > >>>>>>>> itself. >> > > > > > >>>>>>>> >> > > > > > >>>>>>>> Best, >> > > > > > >>>>>>>> zhong >> > > > > > >>>>>>>> >> > > > > > >>>>>>>> >> > > > > > >>>>>>>> On Tue, Oct 27, 2009 at 6:05 PM, Ryan Rawson < >> > > > > [email protected]> >> > > > > > >>>>>>>> >> > > > > > >>>>>>> wrote: >> > > > > > >>>>> >> > > > > > >>>>>> Set the ZK timeout to something like 40ms, and give the >> GC >> > > > > enough >> > > > > > >>>>>>>> >> > > > > > >>>>>>> Xmx >> > > > > > >>>> >> > > > > > >>>>> so you never risk entering the much dreaded >> > > > > concurrent-mode-failure >> > > > > > >>>>>>>>> whereby the entire heap must be GCed. >> > > > > > >>>>>>>>> >> > > > > > >>>>>>>>> Consider testing Java 7 and the G1 GC. >> > > > > > >>>>>>>>> >> > > > > > >>>>>>>>> We could get a JNI thread to do this, but no one has >> done >> > > so >> > > > > yet. >> > > > > > I >> > > > > > >>>>>>>>> >> > > > > > >>>>>>>> am >> > > > > > >>>> >> > > > > > >>>>> personally hoping for G1 and in the meantime >> overprovision >> > our >> > > > Xmx >> > > > > > >>>>>>>>> >> > > > > > >>>>>>>> to >> > > > > > >>>> >> > > > > > >>>>> avoid the concurrent mode failures. >> > > > > > >>>>>>>>> >> > > > > > >>>>>>>>> -ryan >> > > > > > >>>>>>>>> >> > > > > > >>>>>>>>> On Tue, Oct 27, 2009 at 2:59 PM, Zhenyu Zhong < >> > > > > > >>>>>>>>> >> > > > > > >>>>>>>> [email protected]> >> > > > > > >>>>> >> > > > > > >>>>>> wrote: >> > > > > > >>>>>>>>> >> > > > > > >>>>>>>>> Ryan, >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>>> Thank you very much. >> > > > > > >>>>>>>>>> May I ask whether there are any ways to get around >> this >> > > > > problem >> > > > > > to >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>> make >> > > > > > >>>>> >> > > > > > >>>>>> HBase more stable? >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>>> best, >> > > > > > >>>>>>>>>> zhong >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>>> On Tue, Oct 27, 2009 at 4:06 PM, Ryan Rawson < >> > > > > > [email protected]> >> > > > > > >>>>>>>>>> wrote: >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>>> There isnt any working code yet. Just an idea, and a >> > > > > prototype. >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>>>> There is some sense that if we can get the G1 GC >> that >> > we >> > > > > could >> > > > > > >>>>>>>>>>> get >> > > > > > >>>>>>>>>>> >> > > > > > >>>>>>>>>> rid >> > > > > > >>>>> >> > > > > > >>>>>> of all long pauses, and avoid the need for this. >> > > > > > >>>>>>>>>>> >> > > > > > >>>>>>>>>>> -ryan >> > > > > > >>>>>>>>>>> >> > > > > > >>>>>>>>>>> On Mon, Oct 26, 2009 at 2:30 PM, Zhenyu Zhong < >> > > > > > >>>>>>>>>>> [email protected]> >> > > > > > >>>>>>>>>>> wrote: >> > > > > > >>>>>>>>>>> >> > > > > > >>>>>>>>>>> Hi, >> > > > > > >>>>>>>>>>>> >> > > > > > >>>>>>>>>>>> I am very interesting to the solution that Joey >> > proposed >> > > > and >> > > > > > >>>>>>>>>>>> >> > > > > > >>>>>>>>>>> would >> > > > > > >>>> >> > > > > > >>>>> like >> > > > > > >>>>>>>>>>> >> > > > > > >>>>>>>>>> to >> > > > > > >>>>>>>>>> >> > > > > > >>>>>>>>>>> have a try. >> > > > > > >>>>>>>>>>>> Does anyone have any ideas on how to deploy this >> > > > zk_wrapper >> > > > > in >> > > > > > >>>>>>>>>>>> >> > > > > > >>>>>>>>>>> JNI >> > > > > > >>>> >> > > > > > >>>>> integration? >> > > > > > >>>>>>>>>>>> >> > > > > > >>>>>>>>>>>> I would be very appreciated. >> > > > > > >>>>>>>>>>>> >> > > > > > >>>>>>>>>>>> thanks >> > > > > > >>>>>>>>>>>> zhong >> > > > > > >>>>>>>>>>>> >> > > > > > >>>>>>>>>>>> >> > > > > > >>>>>>>>>>>> >> > > > > > >>> >> > > > > > > >> > > > > > >> > > > > >> > > > >> > > >> > >> > >
