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From "Josh Elser (JIRA)" <>
Subject [jira] [Commented] (ACCUMULO-624) iterators may open lots of compressors
Date Mon, 04 Jan 2016 19:43:40 GMT


Josh Elser commented on ACCUMULO-624:

I thought it was related to the pooling code, not the codec, but I could be completely wrong
(as is often the case).

If you have the cycles to write a test, feel free to include it as a utility in the accumulo-test
maven module. This would be a nice tool to have in our pocket for the future!

> iterators may open lots of compressors
> --------------------------------------
>                 Key: ACCUMULO-624
>                 URL:
>             Project: Accumulo
>          Issue Type: Bug
>          Components: tserver
>            Reporter: Eric Newton
> A large iterator tree may create many instances of Compressors.  These instances are
pulled from a pool that never decreases in size.  So, if 50 simultaneous queries are run over
dozens of files, each with a complex iterator stack, there will be thousands of compressors
created.  Each of these holds a large buffer.  This can cause the server to run out of memory.

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