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https://issues.apache.org/jira/browse/LUCENE-6546?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14580928#comment-14580928
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Steve Rowe commented on LUCENE-6546:
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I beasted {{Test2BPostingsBytes}} with the attached patch and
{{-Dtests.heapsize=30g -Dtests.codec=Compressing}}, with the randomization in
{{CompressingCodec.getRandomInstance()}} modified to produce {{maxDocsPerChunk
* blockSize}} between 1 and 30, and got no OOMs from 100 runs each under Java7
and Java8 (Debian 8 Linux, OpenJDK 1.7.0_79, Oracle JDK 1.8.0_45).
> Test2BPostingsBytes sometimes OOMs even with -Dtests.heapsize=30g
> -----------------------------------------------------------------
>
> Key: LUCENE-6546
> URL: https://issues.apache.org/jira/browse/LUCENE-6546
> Project: Lucene - Core
> Issue Type: Bug
> Components: general/test
> Reporter: Steve Rowe
> Priority: Minor
> Attachments: LUCENE-6546.patch
>
>
> Here's an example:
> [http://jenkins.sarowe.net/job/Lucene-core-nightly-monster-5.x-Java7/22/console];
> the seed still OOMs for me when {{-Dtests.heapsize=60g}}:
> {noformat}
> ant test -Dtestcase=Test2BPostingsBytes -Dtests.method=test
> -Dtests.seed=F99606D852DB1420 -Dtests.nightly=true -Dtests.slow=true
> -Dtests.locale=sr_RS_#Latn -Dtests.timezone=America/Port-au-Prince
> -Dtests.asserts=true -Dtests.file.encoding=ISO-8859-1
> {noformat}
> (Although the repro line doesn't include all of them - [~dawid.weiss] is this
> expected? - the above-linked job runs with {{-Dtests.jvms=4
> -Dtests.nightly=true -Dtests.monster=true -Dtests.heapsize=30g}}.)
> I narrowed the problem down to {{CompressingCodec}} - any of the 4 subclasses
> - with {{maxDocsPerChunk * blockSize}} less than 16. The other variable
> randomized in {{CompressingCodec.randomInstance()}} is {{chunkSize}}, which
> doesn't seem to be implicated in the OOMs.
> I guess we could suppress {{CompressingCodec}}, or just expect OOMs from time
> to time (the above condition happens fairly rarely). But I'd rather continue
> to exercise {{CompressingCodec}} as much as possible.
> Here are the OOMs I saw with {{-Dtests.heapsize=30g}} and
> {{-Dtests.codec=CompressingCodec}}:
> ||compressionMode||chunkSize||maxDocsPerChunk||blockSize||
> |DUMMY|3|2|1|
> |DUMMY|7|1|1|
> |FAST_DECOMPRESSION|10|9|1|
> |FAST_DECOMPRESSION|31614|3|4|
> |FAST|21879|1|9|
> |DUMMY|3|3|1|
> |HIGH_COMPRESSION|4167|10|1|
> |HIGH_COMPRESSION|12437|2|5|
> |DUMMY|4|3|2|
> |HIGH_COMPRESSION|3|3|2|
> |FAST_DECOMPRESSION|3339|10|1|
> |DUMMY|2|5|3|
> Here are some that did *not* OOM:
> ||compressionMode||chunkSize||maxDocsPerChunk||blockSize||
> |DUMMY|4|4|4|
> |DUMMY|4|2|246|
> |FAST|30677|907|2|
> |FAST_DECOMPRESSION|15165|2|10|
> |FAST_DECOMPRESSION|28633|67|1|
> |DUMMY|7|3|9|
> |DUMMY|2835|9|3|
> |DUMMY|25785|4|7|
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