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From Jiajun Chen <cjjvict...@gmail.com>
Subject Error when Upgrading from 0.90.x to 0.92.x
Date Mon, 12 Mar 2012 14:24:30 GMT
2012-03-12 22:05:50,736 DEBUG
org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation:
Cached location for .META.,,1.1028785192 is slave184.uc.uuwatch.com:60020
2012-03-12 22:05:50,736 DEBUG
org.apache.hadoop.hbase.client.HTable$ClientScanner: Creating scanner over
.META. starting at key ''
2012-03-12 22:05:50,736 DEBUG
org.apache.hadoop.hbase.client.HTable$ClientScanner: Advancing internal
scanner to startKey at ''
2012-03-12 22:05:52,291 DEBUG
org.apache.hadoop.hbase.client.HTable$ClientScanner: Finished with scanning
at {NAME => '.META.,,1', STARTKEY => '', ENDKEY => '', ENCODED =>
1028785192,}
2012-03-12 22:05:52,821 FATAL org.apache.hadoop.hbase.master.HMaster:
Master server abort: loaded coprocessors are: []
2012-03-12 22:05:52,822 FATAL org.apache.hadoop.hbase.master.HMaster:
Unhandled exception. Starting shutdown.
java.lang.NullPointerException
        at
org.apache.hadoop.hbase.master.AssignmentManager.rebuildUserRegions(AssignmentManager.java:2190)
        at
org.apache.hadoop.hbase.master.AssignmentManager.joinCluster(AssignmentManager.java:323)
        at
org.apache.hadoop.hbase.master.HMaster.finishInitialization(HMaster.java:501)
        at org.apache.hadoop.hbase.master.HMaster.run(HMaster.java:326)
        at java.lang.Thread.run(Thread.java:662)
2012-03-12 22:05:52,832 INFO org.apache.hadoop.hbase.master.HMaster:
Aborting
2012-03-12 22:05:52,833 DEBUG org.apache.hadoop.hbase.master.HMaster:
Stopping service threads
2012-03-12 22:05:52,833 INFO org.apache.hadoop.ipc.HBaseServer: Stopping
server on 60000
2012-03-12 22:05:52,833 INFO org.apache.hadoop.ipc.HBaseServer: IPC Server
handler 0 on 60000: exiting

In the Apache HBase Reference Guide :
hbase.coprocessor.master.classes

A comma-separated list of
org.apache.hadoop.hbase.coprocessor.MasterObserver coprocessors that are
loaded by default on the active HMaster process. For any implemented
coprocessor methods, the listed classes will be called in order. After
implementing your own MasterObserver, just put it in HBase's classpath and
add the fully qualified class name here.

Default:

which class should I use ?

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