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From Doug Meil <doug.m...@explorysmedical.com>
Subject HBase remote client configuration experience
Date Tue, 09 Mar 2010 15:09:38 GMT

The question of HBase client remote configuration (i.e., the client is not running on the
same machine as the HBase master) comes up periodically on these dist-lists and a common theme
is a lack of documentation on exactly what it takes to configure a remote client connection.

After some trial and error, this seems to be the absolute minimum number of parameters required
for connecting to a remote HBase instance (tested with HBase 0.20.3).

HBaseConfiguration config = new HBaseConfiguration();
config.set("hbase.zookeeper.quorum", "server");

This is consistent with other references to the importance of "hbase.zookeeper.quorum" except
that we did this testing with the intent of connecting using only parameters set in code to
eliminate any classpath issues with XML files.

FYI... If the last parameter isn't set you'll get the following error....       could this
be defaulted to a reasonable value?

10/03/09 10:04:55 ERROR zookeeper.ZooKeeperWrapper: no clientPort found in zoo.cfg
Exception in thread "main" java.io.IOException: Could not read quorum servers from zoo.cfg
      at org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.<init>(ZooKeeperWrapper.java:85)
      at org.apache.hadoop.hbase.client.HConnectionManager$ClientZKWatcher.getZooKeeperWrapper(HConnectionManager.java:223)
      at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.getZooKeeperWrapper(HConnectionManager.java:932)
      at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:948)
      at org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:625)

Doug Meil
Director of Engineering

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