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From: Ken Weiner <ken@gumgum.com>
Date: Wed, 21 Dec 2011 15:29:38 -0800
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Subject: Re: Client with HTablePool can't connect after server restart
To: user@hbase.apache.org, lars hofhansl <lhofhansl@yahoo.com>
Cc: "hbase-user@hadoop.apache.org" <hbase-user@hadoop.apache.org>
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I experienced the problem in production with a fully distributed setup.  I
then reproduced the same problem in local mode from which I copied the
error messages.  The messages in production were exactly the same except
that they contained a server name rather than "localhost".

Should I expect to be able to restart HBase without having to restart my
clients (each web server in a cluster has its own HTablePool)?

On Wed, Dec 21, 2011 at 3:20 PM, lars hofhansl <lhofhansl@yahoo.com> wrote:

> Is this is local mode? In local mode ports of Master and RegionServer
> might change and the client cannot (be expected to) deal with that.
>
>
>
> ________________________________
>  From: Ken Weiner <ken@gumgum.com>
> To: hbase-user@hadoop.apache.org
> Sent: Wednesday, December 21, 2011 3:06 PM
> Subject: Client with HTablePool can't connect after server restart
>
> Our Java client uses HTablePool and is not able to connect to the
> server after a server reboot (stop-hbase.sh followed by start-hbase.sh).
> Partial stack trace:
>
> java.net.ConnectException: Connection refused
> at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
> at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:567)
> at
>
> org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
> at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:408)
> at
>
> org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:328)
> at
> org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:883)
>          ...
> at
> org.apache.hadoop.hbase.client.HTablePool.createHTable(HTablePool.java:133)
> at org.apache.hadoop.hbase.client.HTablePool.getTable(HTablePool.java:96)
>
> Furthermore, the following message is continuously printed:
>
> - Socket connection established to localhost/127.0.0.1:2181, initiating
> session
> - Unable to read additional data from server sessionid 0x1345e2d625d0009,
> likely server has closed socket, closing socket connection and attempting
> reconnect
>
> After an HBase restart, is there any way to restore the HBase client (which
> is part of a web application) without having to restart it?
>
> Environment:
> - HBase 0.90.4
> - HBase-Managed Zookeeper 3.3.2-1031432
> - Ubuntu Server
>
> Thanks,
>
> -Ken
>

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