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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7310) Allow region server UI to display critical errors such as those corresponding to ClassNotFoundException when loading user coprocessors
Date Sun, 09 Dec 2012 13:37:21 GMT
Ted Yu created HBASE-7310:
-----------------------------

             Summary: Allow region server UI to display critical errors such as those corresponding
to ClassNotFoundException when loading user coprocessors
                 Key: HBASE-7310
                 URL: https://issues.apache.org/jira/browse/HBASE-7310
             Project: HBase
          Issue Type: Bug
            Reporter: Ted Yu


When working on HBASE-7205, I logged the following comment:

The reason for coprocessor loading to tolerate ClassNotFoundException is that the user table
region where jar file and classname mismatch can reside on any of the region servers in the
cluster. If we don't tolerate the mismatch, it is possible that all region servers in the
cluster abort.

I think we should allow region server UI to display critical errors such as those corresponding
to ClassNotFoundException when loading user coprocessors. This would help user quickly identify
issues without forcing them to scan region server log(s).

Region server can also send such critical errors to master so that master can aggregate the
errors and give user a central place to check critical errors.

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