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From "Emmanuel Lecharny (JIRA)" <j...@apache.org>
Subject [jira] Closed: (DIRMINA-641) Configurable memory limit for CompressionFilter
Date Fri, 22 Jan 2010 17:35:21 GMT

     [ https://issues.apache.org/jira/browse/DIRMINA-641?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Emmanuel Lecharny closed DIRMINA-641.
-------------------------------------


> Configurable memory limit for CompressionFilter
> -----------------------------------------------
>
>                 Key: DIRMINA-641
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-641
>             Project: MINA
>          Issue Type: Wish
>          Components: Filter
>    Affects Versions: 1.0.10, 1.1.7, 2.0.0-M3
>         Environment: Cross-platform
>            Reporter: Mauritz Lovgren
>
> Currently, there is a large build-up of memory due to the fact that CompressionFilter
(or morewhat jzlib) builds up memory structures for efficient compression over time.
> The problem arises when using thousands of connections, as the CompressionFilter keeps
compression data per IoSession, holding several hundreds of megabytes from being GCed.
> Would help a lot if maximum amount of memory cached by ZStream could be configurable.
Would rather have small memory footprint and a bit worse compression...
> Example: I have 6000 connections to a proxy, using CompressionFilter between proxy and
clients. When profiling with JProfiler, I find that 2GB of the heap in the proxy is used only
by CompressionFilter (ZLib) objects. (!) These objects are not GCed until connections close.
> For now I have created a workaround that compresses each message within the encoder by
using standard java.util.zip compression. But it is bad design, since it really is better
to perform this using a filter externally from a decoder... (?)

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