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From "Benedict (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-8459) "autocompaction" on reads can prevent memtable space reclaimation
Date Thu, 11 Dec 2014 13:14:13 GMT
Benedict created CASSANDRA-8459:
-----------------------------------

             Summary: "autocompaction" on reads can prevent memtable space reclaimation
                 Key: CASSANDRA-8459
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8459
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Benedict
            Assignee: Benedict
             Fix For: 2.1.3


Memtable memory reclamation is dependent on reads always making progress, however on the collectTimeOrderedData
critical path it is possible for the read to perform a _write_ inline, and for this write
to block waiting for memtable space to be reclaimed. However the reclaimation is blocked waiting
for this read to complete.

There are a number of solutions to this, but the simplest is to make the defragmentation happen
asynchronously, so the read terminates normally.



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