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From Gary Helmling <ghelml...@gmail.com>
Subject Re: Unable to run aggregation using AggregationClient in HBase0.92
Date Mon, 07 May 2012 21:00:59 GMT
> org.apache.hadoop.hbase.ipc.HBaseRPC$UnknownProtocolException:
> org.apache.hadoop.hbase.ipc.HBaseRPC$UnknownProtocolException: No matching
> handler for protocol org.apache.hadoop.hbase.coprocessor.AggregateProtocol
> in region transactions,,1335223974116.e9190687f8a74b5083b39b6e5bd55705.

The exception indicates that the AggregateImplementation coprocessor
is not loaded on your region servers.  Setting
"hbase.coprocessor.region.classes" in the client configuration that
you use is not sufficient.  You need to either set this in the
hbase-site.xml file used by your region servers (and restart the
region servers), or you can enable the coprocessor for a specific
table by disabling the table, setting a property on the
HTableDescriptor and re-enabling the table.

For more details, see

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