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From "Benedict (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-8459) "autocompaction" on reads can prevent memtable space reclaimation
Date Thu, 11 Dec 2014 13:28:13 GMT


Benedict commented on CASSANDRA-8459:

No need, already sussed the problem and attached the fix

> "autocompaction" on reads can prevent memtable space reclaimation
> -----------------------------------------------------------------
>                 Key: CASSANDRA-8459
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>             Fix For: 2.1.3
>         Attachments: 8459.txt
> 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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