In general it should come up pretty fast, usually less than a second.
You can also see the following Ops level commands - ruok and stat in
particular will give you insight into the current status of the server.
http://hadoop.apache.org/zookeeper/docs/current/zookeeperAdmin.html#sc_zkCommands
We have JMX monitoring as well if that works for you.
Patrick
Mark Vigeant wrote:
Patrick-
Thanks a lot, the shell connections worked on each host. This is
interesting because when I tried to run the very same code last week,
it didn't work... does zookeeper just take a while to boot up or
something? I left it up over the weekend, hence my thinking on time
being a factor here...
I just started HBase up again and I got an IOException: NoNode for
/hbase/master but then it started up anyways. However, when I run the
shell and type "list" it gives me a "NoServerForRegionException:
Timed out trying to locate root region" and then a huge trace. It
then tries to debug and sleeps for intervals of 2000 ms. So it seems
to me like the zookeeper tree doesn't have the information it's
supposed to: am I right here? Is there a way to format and restart
everything here/ will that help?
Another interesting tidbit is that when I run "bin/stop-hbase" from
my master, the HMaster gets shut down, but none of the regionservers
do.
-Mark -----Original Message----- From: Patrick Hunt
[mailto:[email protected]] Sent: Friday, November 20, 2009 6:54 PM To:
[email protected] Subject: Re: Zookeeper Error:
Are you able to connect to the ZK quorum using the ZK shell?
http://hadoop.apache.org/zookeeper/docs/current/zookeeperAdmin.html#sc_zkMulitServerSetup
specifically try (replace "host" with fry or leela - test both
hosts):
java -cp
zookeeper-3.2.1.jar:lib/log4j-1.2.15.jar:lib/jline-0.9.94.jar
org.apache.zookeeper.ZooKeeperMain -server host:2181
which should output something like:
Connecting to host:2181 Welcome to ZooKeeper!
WatchedEvent: Server state change. New state: SyncConnected [zk:
localhost:2181(CONNECTED) 0]
The shell should indicate if you are able to connect or not, then try
something like:
ls /
[badd1, fo3, foo::bar, p1, zookeeper, p0, foo:bar] [zk:
localhost:2181(CONNECTED) 1]
and see if that works?
Patrick
Mark Vigeant wrote:
Hey-
So I'm trying to run a HBase 0.20.2 test instance on a 4 node
hadoop 0.20.0 cluster. I have a 2-server ZK 3.2.1 quorum and I
started putting HBase on the nodes, but I'm running into a problem:
Whenever I try to create a test table or something I get-
NativeException:
org.apache.hadoop.hbase.master.NotAllMetaRegionsOnlineException
Then a huge trace. Now, I think this has to do with my zookeeper
instance, but I'm not entirely sure. In my 2 zk nodes I have the
following zoo.cfg:
tickTime=2000 dataDir=/home/hadoop/zookeeper-3.2.1/data
clientPort=2181 initLimit=5 syncLimit=2 server.1=fry:2888:3888
server.2=leela:2888:3888
The way I start zookeeper is by running bin/zkServer start on both,
and they then go through leader election etc. Is there something
else I should run?
Thanks a lot. I apologize for being a total n00b. Also, I know
zookeeper is a 2n+1 system but I don't know how to run a 1 server
quorum without having it run in standalone mode.
Mark Vigeant RiskMetrics Group, Inc.
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