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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1591) Enable bzip compression in benchmark
Date Sun, 12 Apr 2009 03:20:14 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12698161#action_12698161
] 

Shai Erera commented on LUCENE-1591:
------------------------------------

Before I post a patch I wanted to test reading the 20090306 enwiki dump and write it as a
one line document, all using the bz2 in/out streams. After 9 hours and 2881000 documents (!!!),
I've hit the following exception:

{code}
Exception in thread "Thread-1" java.lang.ArrayIndexOutOfBoundsException
	at org.apache.xerces.impl.io.UTF8Reader.read(Unknown Source)
	at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
	at org.apache.xerces.impl.XMLEntityScanner.scanContent(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanContent(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.apache.lucene.benchmark.byTask.feeds.EnwikiDocMaker$Parser.run(EnwikiDocMaker.java:76)
	at java.lang.Thread.run(Thread.java:810)
{code}

Same exception like Mike hit, only from a different method. I'm using the latest xerces jar
Mike put. I'm beginning to think this enwiki dump is jinxed :)

Anyway, I'll post the patch shortly and run on the 20070527 version to verify.

> 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
>
>
> 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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