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From matan <ma...@cloudaloe.org>
Subject Connecting to standalone HBase from a remote client
Date Sun, 25 Nov 2012 20:37:12 GMT
Hi,

With gracious help on this forum (from ramkrishna vasudevan) I've managed to
setup HBase 0.94.2 in standalone mode on Ubuntu, and proceeded to writing a
small client. I am trying to run the client from a remote server, not the
one where HBase is running on. It seems pretty obvious looking at both
server and client side logs, that my client successfully connects to
zookeeper, but then tries to perform the actual interaction against the
wrong network address. It looks like it is wrongfully trying to address
localhost on the HBase client side rather than addressing the server where
HBase is installed. 

In terms of flow, I guess that zookeeper provides my client with how to
interact with HBase, and that it informs my client to that end that the name
of the server to contact is 'localhost'. I can guess this may be changed,
presumably by configuring HBase on the server side. Assuming that the
correct flow should be that my client would get informed of the real name of
the HBase server, by zookeeper. However I failed managing to configure just
that. I tried the hbase.master property, but it had no effect.

local HBase shell works just fine. The logs which led me to this analysis
follow, perhaps you will agree with my analysis. How should I change my
configuration to solve this? (making my client able to communicate with
HBase after making the zookeeper connection...).

*Server side log:*
2012-11-25 22:25:14,856 INFO
org.apache.hadoop.hbase.master.AssignmentManager: The master has opened the
region test4,,1353836779589.bb29c037092c5d69c9efc8f13c2b2563. that was
online on localhost,58063,1353875103994
2012-11-25 22:26:05,670 INFO
org.apache.zookeeper.server.NIOServerCnxnFactory: Accepted socket connection
from /my-client-ip:49447
2012-11-25 22:26:05,672 INFO org.apache.zookeeper.server.ZooKeeperServer:
Client attempting to establish new session at /my-client-ip:49447
2012-11-25 22:26:05,720 INFO org.apache.zookeeper.server.ZooKeeperServer:*
Established session 0x13b393e9d1d0004 with negotiated timeout 40000 for
client /my-client-ip:49447*
2012-11-25 22:27:05,354 WARN org.apache.zookeeper.server.NIOServerCnxn:
Exception causing close of session 0x13b393e9d1d0004 due to
java.io.IOException: Connection reset by peer
2012-11-25 22:27:05,355 INFO org.apache.zookeeper.server.NIOServerCnxn:
Closed socket connection for client /my-client-ip:49447 which had sessionid
0x13b393e9d1d0004

*Client side log:*
12/11/25 22:25:51 INFO zookeeper.ZooKeeper: Initiating client connection,
connectString=my-hbase-server-ip:2181 sessionTimeout=180000
watcher=hconnection
12/11/25 22:25:51 INFO zookeeper.ClientCnxn: Opening socket connection to
server /my-hbase-server-ip:2181
12/11/25 22:25:51 INFO zookeeper.RecoverableZooKeeper: The identifier of
this process is 12372@P-Cloudaloe-01
12/11/25 22:25:55 INFO client.ZooKeeperSaslClient: Client will not
SASL-authenticate because the default JAAS configuration section 'Client'
could not be found. If you are not using SASL, you may ignore this. On the
other hand, if you expected SASL to work, please fix your JAAS
configuration.
12/11/25 22:25:55 INFO zookeeper.ClientCnxn: Socket connection established
to my-hbase-server-ip/my-hbase-server-ip:2181, initiating session
12/11/25 22:25:55 INFO zookeeper.ClientCnxn: Session establishment complete
on server my-hbase-server-ip/my-hbase-server-ip:2181, sessionid =
0x13b393e9d1d0004, negotiated timeout = 40000
12/11/25 22:25:57 INFO ipc.HBaseRPC: *Server at localhost/127.0.0.1:58063
could not be reached* after 1 tries, giving up.
12/11/25 22:26:00 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
12/11/25 22:26:03 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
12/11/25 22:26:06 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
12/11/25 22:26:10 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
12/11/25 22:26:14 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
12/11/25 22:26:20 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
12/11/25 22:26:26 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
12/11/25 22:26:36 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
12/11/25 22:26:54 INFO ipc.HBaseRPC: Server at localhost/127.0.0.1:58063
could not be reached after 1 tries, giving up.
Exception in thread "main"
org.apache.hadoop.hbase.client.NoServerForRegionException: Unable to find
region for myLittleHBaseTable,,99999999999999 after 10 tries.
	at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:955)
	at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:860)
	at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:962)
	at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:864)
	at
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:821)
	at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:234)
	at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:174)
	at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:133)
	at HelloWorld.main(HelloWorld.java:30)

Thanks!
matan




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