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From "Wang Qiang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-8445) regionserver can't load an updated coprocessor jar with the same jar path
Date Fri, 26 Apr 2013 06:38:16 GMT
Wang Qiang created HBASE-8445:
---------------------------------

             Summary: regionserver can't load an updated coprocessor jar with the same jar
path
                 Key: HBASE-8445
                 URL: https://issues.apache.org/jira/browse/HBASE-8445
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.94.5
            Reporter: Wang Qiang
         Attachments: patch_20130426_01.txt

when I update a coprocessor jar, then I disable and enable the table with the coprocessor,
but the new features in the updated coprocessor jar doesn't make any sense. Follow into the
class 'org.apache.hadoop.hbase.coprocessor.CoprocessorHost', I found that there's a coprocessor
class loader cache , of which the key is the coprocessor jar path(although the key is a weak
reference), so when I disable/enable the table, it got a cached coprocessor class loader from
the cache with the jar path, and it didn't try to reload the coprocessor jar from the hdfs.
Here I give a patch, in which I add an extra info which is 'FileCheckSum' with the coprocessor
class loader cache, if the checksum is changed, try to reload the jar from the hdfs path

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