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From: Michael Spiegle <mike@nauticaltech.com>
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Subject: How do I test SampleRegionWALObserver?
Message-Id: <20A8D871-E8EC-4E13-A5EE-F03FF8781135@nauticaltech.com>
Date: Thu, 25 Oct 2012 07:56:05 -0400
To: user@hbase.apache.org
Mime-Version: 1.0 (Mac OS X Mail 6.1 \(1498\))

I'm using CDH4, but I'd imagine that the steps would be similar for =
upstream HBase.  I've already got the tests JAR file loaded as part of =
my classpath.  I also have the following in my hbase-site.xml:
<property>
  <name>hbase.coprocessor.region.classes</name>
  =
<value>org.apache.hadoop.hbase.coprocessor.SampleRegionWALObserver</value>=

</property>

When I start HBase, the following shows up in my logs:
# grep Sample /var/log/hbase/hbase-hbase-regionserver-hbase01.log=20
2012-10-24 13:06:13,126 INFO =
org.apache.hadoop.hbase.coprocessor.CoprocessorHost: System coprocessor =
org.apache.hadoop.hbase.coprocessor.SampleRegionWALObserver was loaded =
successfully with priority (536870911).

However, when I 'PUT' new rows in my table, I see no log entries show up =
for SampleRegionWALObserver.  After looking at the =
SampleRegionWALObserver code, it seems that I need to call =
setTestValues() in order to get preWALWrite() to execute the rest of the =
code.  I think this is something that I might be able to accomplish via =
the 'hbase shell', but I can't figure out how. Can anyone help point me =
in the right direction?

For reference, this is the code I'm looking at:
=
http://svn.apache.org/repos/asf/hbase/tags/0.92.1/src/test/java/org/apache=
/hadoop/hbase/coprocessor/SampleRegionWALObserver.java

Regards,
Michael Spiegle=