[jira] [Resolved] (OAK-1917) FileNotFoundException during TarMK GC

["Jukka Zitting (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OAK-1917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jukka Zitting resolved OAK-1917.
--------------------------------

       Resolution: Fixed
    Fix Version/s: 1.0.2
                   1.1

Fixed in revision 1605670, and merged to the 1.0 branch (for 1.0.2) in revision 1605671.

> FileNotFoundException during TarMK GC
> -------------------------------------
>
>                 Key: OAK-1917
>                 URL: https://issues.apache.org/jira/browse/OAK-1917
>             Project: Jackrabbit Oak
>          Issue Type: Bug
>          Components: core, segmentmk
>    Affects Versions: 1.0.1
>            Reporter: Jukka Zitting
>            Assignee: Jukka Zitting
>             Fix For: 1.1, 1.0.2
>
>
> When running garbage collection on a TarMK repository, it's in certain cases possible for the following {{FileNotFoundException}} to occur:
> {noformat}
> java.io.FileNotFoundException: /path/to/dataNNNNNNb.tar (No such file or directory)
>         at java.io.RandomAccessFile.open(Native Method) ~[na:1.7.0_55]
>         at java.io.RandomAccessFile.<init>(RandomAccessFile.java:241) ~[na:1.7.0_55]
>         at org.apache.jackrabbit.oak.plugins.segment.file.TarReader.openFirstFileWithValidIndex(TarReader.java:186) [oak-run-1.0.2-SNAPSHOT.jar:1.0.2-SNAPSHOT]
>         at org.apache.jackrabbit.oak.plugins.segment.file.TarReader.cleanup(TarReader.java:647) [oak-run-1.0.2-SNAPSHOT.jar:1.0.2-SNAPSHOT]
>         at org.apache.jackrabbit.oak.plugins.segment.file.FileStore.flush(FileStore.java:375) [oak-run-1.0.2-SNAPSHOT.jar:1.0.2-SNAPSHOT]
>         at org.apache.jackrabbit.oak.plugins.segment.file.FileStore.close(FileStore.java:465) [oak-run-1.0.2-SNAPSHOT.jar:1.0.2-SNAPSHOT]
>         at org.apache.jackrabbit.oak.run.Main.compact(Main.java:177) [oak-run-1.0.2-SNAPSHOT.jar:1.0.2-SNAPSHOT]
>         at org.apache.jackrabbit.oak.run.Main.main(Main.java:108) [oak-run-1.0.2-SNAPSHOT.jar:1.0.2-SNAPSHOT]
> {noformat}
> I originally assumed this error to be some weird platform issue, based on some online reports about a new file not being available for opening during a brief period after it was created. However, the explanation for this issue is more deterministic:
> If the tar file in question was created with an Oak 0.x version from before OAK-1780, then it wouldn't contain the pre-compiled segment graph information. Due to a slight bug in the OAK-1780 implementation, this would prevent a tar file that's full of garbage from being simply removed. Instead a new, empty tar file would get generated, and due to the lazy writing implemented OAK-631 that file would actually never get created. Thus the FileNotFoundException.
> To fix this problem, we need to make sure that a tar file that's full of garbage will get cleanly removed even if it doesn't contain a pre-compiled segment graph.



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