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Date: Sun, 21 Nov 2010 21:36:17 -0800
Message-ID: <AANLkTimxdWLb_0DSKKGaCyvBUU1WiEDA5ETqjR7h=qYv@mail.gmail.com>
Subject: Re: Question about Zookeeper quorum
From: Ted Yu <yuzhihong@gmail.com>
To: user@hbase.apache.org
Content-Type: multipart/alternative; boundary=20cf3054a645a2ed2404959da22c

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The default is true:

bin/zookeepers.sh:if [ "$HBASE_MANAGES_ZK" = "" ]; then
bin/zookeepers.sh:  HBASE_MANAGES_ZK=true

On Sun, Nov 21, 2010 at 9:19 PM, Hari Sreekumar <hsreekumar@clickable.com>wrote:

> Hey Lars,
>
>          I have HQuorumPeer running on all nodes that I specify in my
> hbase-site file. One thing I wanted to clarify.. what is the default value
> of HBASE_MANAGES_ZK ? Because I have not explicitly set it to true in my
> hbase-env.sh file.
>
> thanks,
> hari
>
> On Mon, Nov 22, 2010 at 10:39 AM, Lars George <lars.george@gmail.com>
> wrote:
>
> > Hi Hari,
> >
> > On which of these for machines do you have a ZooKeeper daemon running as
> > well?
> >
> > Lars
> >
> > On Mon, Nov 22, 2010 at 5:51 AM, Hari Sreekumar
> > <hsreekumar@clickable.com> wrote:
> > > Hi,
> > >
> > >    But it is reading settings from hbase-site.xml. If it was not
> reading
> > my
> > > changes, the problem wouldn't have gotten fixed when I add ejabber to
> the
> > > quroum right? After all, it is responding to changes I make in my xml
> > file.
> > > What else can be the issue here?
> > >
> > > hari
> > >
> > > On Mon, Nov 22, 2010 at 12:54 AM, Lars George <lars.george@gmail.com>
> > wrote:
> > >
> > >> Hi Hari,
> > >>
> > >> You are missing the quorum setting. It seems the hbase-site.xml is
> > missing
> > >> from the classpath on the clients. Did you pack it into the jar?
> > >>
> > >> And yes, even one ZK server is fine in such a small cluster.
> > >>
> > >> You can see it is trying to connect to localhost which is the default
> if
> > >> the site file is missing.
> > >>
> > >> Regards,
> > >> Lars
> > >>
> > >> On Nov 21, 2010, at 19:22, Hari Sreekumar <hsreekumar@clickable.com>
> > >> wrote:
> > >>
> > >> > Hi,
> > >> >    Is it necessary that all RegionServers must also be part of the
> ZK
> > >> > Quorum? I have a 4 node cluster, with node hadoop1 being master and
> > >> hadoop2,
> > >> > hadoop3 and ejabber being the slaves (Both in case of hadoop and for
> > >> HBase).
> > >> >
> > >> > When I keep only 3 nodes in the zookeeper.quorum property:
> > >> > <name>hbase.zookeeper.quorum</name>
> > >> > <value>hadoop1,hadoop2,hadoop3</value>
> > >> >
> > >> > I get this exception for all tasks that run on ejabber(the 4th
> node):
> > >> >
> > >> > 2010-11-21 23:35:47,785 INFO org.apache.zookeeper.ClientCnxn:
> > Attempting
> > >> > connection to server localhost/127.0.0.1:2181
> > >> > 2010-11-21 23:35:47,790 WARN org.apache.zookeeper.ClientCnxn:
> > Exception
> > >> > closing session 0x0 to sun.nio.ch.SelectionKeyImpl@7c2e1f1f
> > >> > 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.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:933)
> > >> > 2010-11-21 23:35:47,791 WARN org.apache.zookeeper.ClientCnxn:
> Ignoring
> > >> > exception during shutdown input
> > >> > java.nio.channels.ClosedChannelException
> > >> >        at
> > >> >
> sun.nio.ch.SocketChannelImpl.shutdownInput(SocketChannelImpl.java:638)
> > >> >        at
> > sun.nio.ch.SocketAdaptor.shutdownInput(SocketAdaptor.java:360)
> > >> >        at
> > >> >
> > org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:999)
> > >> >        at
> > >> > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
> > >> > 2010-11-21 23:35:47,791 WARN org.apache.zookeeper.ClientCnxn:
> Ignoring
> > >> > exception during shutdown output
> > >> > java.nio.channels.ClosedChannelException
> > >> >        at
> > >> >
> > sun.nio.ch.SocketChannelImpl.shutdownOutput(SocketChannelImpl.java:649)
> > >> >        at
> > sun.nio.ch.SocketAdaptor.shutdownOutput(SocketAdaptor.java:368)
> > >> >        at
> > >> >
> > org.apache.zookeeper.ClientCnxn$SendThread.cleanup(ClientCnxn.java:1004)
> > >> >        at
> > >> > org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:970)
> > >> > 2010-11-21 23:35:47,925 WARN
> > >> > org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper: Failed to create
> > >> /hbase
> > >> > -- check quorum servers, currently=localhost:2181
> > >> > org.apache.zookeeper.KeeperException$ConnectionLossException:
> > >> > KeeperErrorCode = ConnectionLoss for /hbase
> > >> >        at
> > >> > org.apache.zookeeper.KeeperException.create(KeeperException.java:90)
> > >> >        at
> > >> > org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
> > >> >        at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:780)
> > >> >        at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:808)
> > >> >        at
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureExists(ZooKeeperWrapper.java:405)
> > >> >        at
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureParentExists(ZooKeeperWrapper.java:432)
> > >> >        at
> > >> >
> > >>
> >
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.checkOutOfSafeMode(ZooKeeperWrapper.java:545)
> > >> >
> > >> > When I add ejabber also to the ZK quorum and restart HBase, I don't
> > get
> > >> this
> > >> > exception. My understanding was that a small cluster like mine
> should
> > >> only
> > >> > need one ZK machine.
> > >> >
> > >> > Thanks,
> > >> > Hari
> > >>
> > >
> >
>

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