[HBASE-8445] regionserver can't load an updated coprocessor jar with the same jar path

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Affects Version/s: 0.94.5
• Assignee: Unassigned
• Reporter: Wang Qiang
• Created: 26/Apr/13 06:36
• Updated: 16/Jun/22 06:03
• Resolved: 26/Apr/13 16:42

Description

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