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From "Ivan Bessonov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-9599) Add ability to manage compression level for compressed WAL archives
Date Mon, 24 Sep 2018 08:51:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-9599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16625541#comment-16625541
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Ivan Bessonov commented on IGNITE-9599:
---------------------------------------

[~a-polyakov] please inspect your tests, there are genuine failures in .NET, maybe something
else.

> Add ability to manage compression level for compressed WAL archives
> -------------------------------------------------------------------
>
>                 Key: IGNITE-9599
>                 URL: https://issues.apache.org/jira/browse/IGNITE-9599
>             Project: Ignite
>          Issue Type: Improvement
>            Reporter: Andrey Kalinin
>            Assignee: Alexand Polyakov
>            Priority: Minor
>
> In some cases, WAL compression performance is not sufficient, i.e. new archives accumulate
faster than old ones are compressed.
> We did some tests: the file size of 1GB is compressed at the default compression level
for 1 minute, the output file size is ~120MB.
> After that, the compression rate was tested with compression-level=-1: 1 GB file is compressed
in 13 seconds, the output file size is ~125MB.
> (from the [zlib manual|https://www.zlib.net/manual.html#Basic]:
> The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9: 1 gives best
speed, 9 gives best compression, 0 gives no compression at all (the input data is simply copied
a block at a time). Z_DEFAULT_COMPRESSION requests a default compromise between speed and
compression (currently equivalent to level 6).
> )
> So we need add an option to change the default compression level in the ignite configuration
file.



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