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https://issues.apache.org/jira/browse/OAK-2855?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Marth updated OAK-2855:
-------------------------------
Labels: resilience (was: )
> CopyOnReadDirectory mode might delete a valid local file upon close
> -------------------------------------------------------------------
>
> Key: OAK-2855
> URL: https://issues.apache.org/jira/browse/OAK-2855
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: lucene
> Reporter: Chetan Mehrotra
> Assignee: Chetan Mehrotra
> Labels: resilience
> Fix For: 1.3.0, 1.0.14, 1.2.3
>
>
> {{CopyOnReadDirectory}} currently deletes local files which are not found in
> remote upon close. The list of remote file is fixed for a given revision
> however list of local files may vary.
> {{IndexTracker}} opens a new {{IndexNode}} upon update before closing the
> older one. When CopyOnRead is enabled it can happen that same local directory
> might be in use by two wrapper directories at the same time.
> This introduces a race condition in {{removeDeletedFiles}} method as by the
> time it is invoked a newer wrapped directory might have started adding new
> files so those files would get included in the listing done for local
> directory and hence cause them to be deleted as they would not be found in
> remote directory which is pinned to older revision. Leading to following
> exception
> {noformat}
> Caused by: java.io.FileNotFoundException:
> /path/to/crx-quickstart/repository/index/e5a943cdec3000bd8ce54924fd2070ab5d1d35b9ecf530963a3583d43bf28293/4/_1r.cfe
> (No such file or directory)
> at java.io.RandomAccessFile.open(Native Method)
> at java.io.RandomAccessFile.<init>(RandomAccessFile.java:241)
> at
> org.apache.lucene.store.MMapDirectory.openInput(MMapDirectory.java:193)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.IndexCopier$CopyOnReadDirectory$FileReference.openLocalInput(IndexCopier.java:393)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.IndexCopier$CopyOnReadDirectory.openInput(IndexCopier.java:221)
> at org.apache.lucene.store.Directory.copy(Directory.java:185)
> at
> org.apache.jackrabbit.oak.plugins.index.lucene.LuceneIndexMBeanImpl.dumpIndexContent(LuceneIndexMBeanImpl.java:104)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> {noformat}
> As a fix the list of local file should be maintained as progress is made once
> the CopyOnRead instance gets created to ensure it does not pick up files
> which are added once the directory is closed
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