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 > > > > >>>>>>>>>>>> > > > > >>>>>>>>>>>> > > > > >>>>>>>>>>>> > > > > >>> > > > > > > > > > > > > > > >
