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From Zhenyu Zhong <zhongresea...@gmail.com>
Subject Re: regarding to HBase 1316 ZooKeeper: use native threads to avoid GC stalls (JNI integration)
Date Thu, 29 Oct 2009 22:35:48 GMT
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 <zhongresearch@gmail.com>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 <stack@duboce.net> 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 <zhongresearch@gmail.com
>> >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 <stack@duboce.net> wrote:
>> >
>> > > On Thu, Oct 29, 2009 at 2:23 PM, Zhenyu Zhong <
>> zhongresearch@gmail.com
>> > > >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 <stack@duboce.net> wrote:
>> > > >
>> > > > > On Thu, Oct 29, 2009 at 11:46 AM, Zhenyu Zhong <
>> > > zhongresearch@gmail.com
>> > > > > >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 <
>> > > zhongresearch@gmail.com
>> > > > > > >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([B@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 <
>> > jlist@streamy.com>
>> > > > > > 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 <stack@duboce.net>
>> > > 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 <
>> > > > > > zhongresearch@gmail.com
>> > > > > > >>>>
>> > > > > > >>>>> 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 <nitayj@gmail.com>
>> > > 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 <
>> > > > > > >>>>>>>
>> > > > > > >>>>>> zhongresearch@gmail.com>
>> > > > > > >>>>
>> > > > > > >>>>>  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 <
>> > > > > ryanobjc@gmail.com>
>> > > > > > >>>>>>>>
>> > > > > > >>>>>>> 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 <
>> > > > > > >>>>>>>>>
>> > > > > > >>>>>>>> zhongresearch@gmail.com>
>> > > > > > >>>>>
>> > > > > > >>>>>>  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 <
>> > > > > > ryanobjc@gmail.com>
>> > > > > > >>>>>>>>>> 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 <
>> > > > > > >>>>>>>>>>> zhongresearch@gmail.com>
>> > > > > > >>>>>>>>>>> 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
>> > > > > > >>>>>>>>>>>>
>> > > > > > >>>>>>>>>>>>
>> > > > > > >>>>>>>>>>>>
>> > > > > > >>>
>> > > > > > >
>> > > > > >
>> > > > >
>> > > >
>> > >
>> >
>>
>
>

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