Ashu Pachauri resolved HBASE-18399.
       Resolution: Duplicate
         Assignee: Ashu Pachauri
    Fix Version/s:     (was: 1.3.2)

Since this has been fixed as part of HBASE-18398, closing it as a duplicate.

> Files in a snapshot can go missing even after the snapshot is taken 
> successfully
> --------------------------------------------------------------------------------
>                 Key: HBASE-18399
>                 URL: https://issues.apache.org/jira/browse/HBASE-18399
>             Project: HBase
>          Issue Type: Sub-task
>          Components: regionserver, Scanners
>            Reporter: Ashu Pachauri
>            Assignee: Ashu Pachauri
> Files missing after the snapshot is taken (only applicable when the TTL for 
> the TimeToLiveHFileCleaner is small, like the default 5 mins)
>     * SnapshotManifest#addRegion visits store_file_A, but is yet to write it 
> to the manifest.
>     * store_file_A is marked as compacted away and HFileArchiver moves the 
> file to archive.
>     * HFileCleaner comes in and sees the store_file_A in archive. It adds the 
> file to the list of files that might need to be cleaned up.
>     * HFileCleaner's SnapshotHFileCleaner plugin is kicked in.
>     * SnapshotFileCache#getUnreferencedFiles also says that store_file_A is 
> unreferenced and should be cleaned up (It has not yet been written to the 
> manifest).
>     * SnapshotHFileCleaner is still going through rest of the files in 
> archive.
>     * store_file_A reference is created and written to snapshot manifest.
>     * Snapshot verification runs and sees the store_file_A is present in 
> archive, and thus the verification passes.
>     * Now, the SnapshotHFileCleaner finishes and TimeToLiveHFileCleaner is 
> triggered. If TTL has passed since the store_file_A was moved to archive 
> (SnapshotHFileCleaner could take easily several minutes to go through rest of 
> the files), the TimeToLiveHFileCleaner also marks the file as deletable.
>     * Since all cleaner plugins marked file as deletable, the store_file_A is 
> deleted.

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