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https://issues.apache.org/jira/browse/LUCENE-6135?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14259611#comment-14259611
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ASF subversion and git services commented on LUCENE-6135:
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Commit 1648188 from [~rcmuir] in branch 'dev/trunk'
[ https://svn.apache.org/r1648188 ]
LUCENE-6135: renumber fields randomly in tests
> re-number fields randomly in tests
> ----------------------------------
>
> Key: LUCENE-6135
> URL: https://issues.apache.org/jira/browse/LUCENE-6135
> Project: Lucene - Core
> Issue Type: Test
> Reporter: Robert Muir
> Attachments: LUCENE-6135.patch
>
>
> Currently some code (such as stored fields bulk merge) depends upon
> consistent field number ordering.
> In the case field numbers do not align, then optimizations are disabled,
> because the would cause crazy corruption where values are mixed up across
> different fields.
> But this is hardly tested today. If i introduce an intentional bug into this
> logic, then only one lone test fails: TestAddIndexes.testFieldNamesChanged,
> and only about 10% of the time at best. In general tests pass.
> {code}
> ---
> lucene/core/src/java/org/apache/lucene/codecs/compressing/MatchingReaders.java
> (revision 1647793)
> +++
> lucene/core/src/java/org/apache/lucene/codecs/compressing/MatchingReaders.java
> (working copy)
> @@ -52,6 +52,10 @@
> for (int i = 0; i < numReaders; i++) {
> for (FieldInfo fi : mergeState.fieldInfos[i]) {
> FieldInfo other = mergeState.mergeFieldInfos.fieldInfo(fi.number);
> + // nocommit:
> + if (true) {
> + break;
> + }
> if (other == null || !other.name.equals(fi.name)) {
> continue nextReader;
> }
> {code}
> Don't get me wrong, its a great simple test, but it should not be the only
> one doing this. And it would be great if it failed more often, i havent
> looked as to why it only fails rarely if there is a bug in this stuff.
> But in general, we should simulate this more. My current idea is to shuffle
> up field numbers in MockRandomMergePolicy.
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