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From "Tyler Hobbs (JIRA)" <>
Subject [jira] Created: (CASSANDRA-1878) Minimize Key Cache Invalidation by Compaction
Date Sat, 18 Dec 2010 00:16:01 GMT
Minimize Key Cache Invalidation by Compaction

                 Key: CASSANDRA-1878
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Tyler Hobbs

Currently, compactions invalidate key cache entries that pointed to the SSTables that were
compacted.  This results in a sudden increase in the number of seeks necessary for reads immediately
after compaction.  When writing out a new SSTable after a compaction, it seems like it should
be possible to store a list of keys that are currently cached but would be invalidated along
with their new position in the new SSTable.  Matt Dennis also seems to think this would be
relatively easy to do.

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