[jira] [Created] (LUCENE-6287) Corrupt index (missing .si file) on first 4.x commit to a 3.x index

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-6287:
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             Summary: Corrupt index (missing .si file) on first 4.x commit to a 3.x index
                 Key: LUCENE-6287
                 URL: https://issues.apache.org/jira/browse/LUCENE-6287
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Michael McCandless
            Assignee: Michael McCandless
            Priority: Blocker
             Fix For: 4.10.4


If you have a 3.x index, and you open it with a 4.x IndexWriter for
the first time, and you do something that kicks of merges while
concurrently committing, it's possible the index will corrupt itself
with exceptions like this:

{noformat}
java.nio.file.NoSuchFileException: /l/tmp/reruns.TestBackwardsCompatibility3x.testMergeDuringUpgrade.t2/lucene.index.TestBackwardsCompatibility3x-71F31CCCEF6853A-001/manysegments.362-006/_0.si
	at sun.nio.fs.UnixException.translateToIOException(UnixException.java:86)
	at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:102)
	at sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:107)
	at sun.nio.fs.UnixFileSystemProvider.newFileChannel(UnixFileSystemProvider.java:177)
	at java.nio.channels.FileChannel.open(FileChannel.java:287)
	at java.nio.channels.FileChannel.open(FileChannel.java:334)
	at org.apache.lucene.store.NIOFSDirectory.openInput(NIOFSDirectory.java:81)
	at org.apache.lucene.store.FilterDirectory.openInput(FilterDirectory.java:80)
	at org.apache.lucene.codecs.lucene3x.Lucene3xSegmentInfoReader.read(Lucene3xSegmentInfoReader.java:106)
	at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:358)
	at org.apache.lucene.index.SegmentInfos$1.doBody(SegmentInfos.java:454)
	at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:906)
	at org.apache.lucene.index.SegmentInfos$FindSegmentsFile.run(SegmentInfos.java:752)
	at org.apache.lucene.index.SegmentInfos.read(SegmentInfos.java:457)
	at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:414)
	at org.apache.lucene.util.TestUtil.checkIndex(TestUtil.java:207)
	at org.apache.lucene.util.TestUtil.checkIndex(TestUtil.java:196)
	at org.apache.lucene.store.BaseDirectoryWrapper.close(BaseDirectoryWrapper.java:45)
	at org.apache.lucene.index.TestBackwardsCompatibility3x.testMergeDuringUpgrade(TestBackwardsCompatibility3x.java:1035)
{noformat}

Back compat tests in Elasticsearch hit this, and at first I thought maybe LUCENE-6279 was the cause (I still think we should fix that) but after further debugging there is a different concurrency bug lurking here.

I have a test case which after substantial beasting is able to reproduce the bug, but I don't yet have a fix.  I think IW is missing a checkpoint after writing a new commit...



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