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https://issues.apache.org/jira/browse/COMPRESS-285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14052155#comment-14052155
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Stefan Bodewig commented on COMPRESS-285:
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I understand the problem but am not sure we can fix it without breaking support
for OSGi. The dependency on XZ is labeled optional in the OSGi part of the
manifest and in theory it may be made available or removed at any point of time.
> checking of availability of XZ compression is expensive - result should be
> reused
> ---------------------------------------------------------------------------------
>
> Key: COMPRESS-285
> URL: https://issues.apache.org/jira/browse/COMPRESS-285
> Project: Commons Compress
> Issue Type: Improvement
> Components: Compressors
> Affects Versions: 1.5, 1.6, 1.7, 1.8
> Environment: linux 64-bit, java 7, glassfish, solr, tika
> Reporter: Wojciech Łozowicki
> Priority: Minor
> Labels: performance
>
> I use solr with apache tika for indexing documents. Tika uses
> commons-compress to handle compressed files. Using sampler (jvisualvm) I have
> seen that quite a lot of time (5-7%) during my tests is spent in
> XZUtils.isXZCompressionAvailable because of unavailable XZ compression (I
> guess for each time classloaders spend some time looking for unavailable
> classes, then NoClassDefFoundError).
> I think the result of the first check should be stored and reused.
> Here is the stacktrace (just to show the way tika is using commons-compress):
> org.apache.commons.compress.compressors.xz.XZUtils.isXZCompressionAvailable(XZUtils.java:52)
> at
> org.apache.commons.compress.compressors.CompressorStreamFactory.createCompressorInputStream(CompressorStreamFactory.java:140)
> at
> org.apache.tika.parser.pkg.ZipContainerDetector.detectCompressorFormat(ZipContainerDetector.java:95)
> at
> org.apache.tika.parser.pkg.ZipContainerDetector.detect(ZipContainerDetector.java:81)
> at
> org.apache.tika.detect.CompositeDetector.detect(CompositeDetector.java:61)
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