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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1591) Enable bzip compression in benchmark
Date Tue, 14 Apr 2009 11:46:15 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698743#action_12698743
] 

Michael McCandless commented on LUCENE-1591:
--------------------------------------------

The test seems to assume you can take any Task in the source tree, and make an alg that simply
creates that task.

I think that assumption is in fact wrong, because tasks like WriteLineDocTask indeed require
certain configuration (line.file.out) be set, and the test can't know that.  Other tasks in
the future will presumably hit the same issue.

Also, thinking about the test, I think it doesn't add much value?  Elsewhere we heavily test
that the .alg parser works properly.  And all this test does is take every task, and stick
it in either "XXX",  "[ XXX ] : 2"  or "{ XXX } : 3", parse it, and verify it parsed properly.

I think we should simply turn those three tests off?  Or, if that seems to drastic, simply
skipping WriteLineDocTask seems OK too?

> Enable bzip compression in benchmark
> ------------------------------------
>
>                 Key: LUCENE-1591
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1591
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: contrib/benchmark
>            Reporter: Shai Erera
>             Fix For: 2.9
>
>         Attachments: commons-compress-dev20090413.jar, commons-compress-dev20090413.jar,
LUCENE-1591.patch, LUCENE-1591.patch, LUCENE-1591.patch, LUCENE-1591.patch
>
>
> bzip compression can aid the benchmark package by not requiring extracting bzip files
(such as enwiki) in order to index them. The plan is to add a config parameter bzip.compression=true/false
and in the relevant tasks either decompress the input file or compress the output file using
the bzip streams.
> It will add a dependency on ant.jar which contains two classes similar to GZIPOutputStream
and GZIPInputStream which compress/decompress files using the bzip algorithm.
> bzip is known to be superior in its compression performance to the gzip algorithm (~20%
better compression), although it does the compression/decompression a bit slower.
> I wil post a patch which adds this parameter and implement it in LineDocMaker, EnwikiDocMaker
and WriteLineDoc task. Maybe even add the capability to DocMaker or some of the super classes,
so it can be inherited by all sub-classes.

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