Zach York updated HBASE-21070:
    Attachment: HBASE-21070.master.001.patch

> SnapshotFileCache won't update for snapshots stored in S3
> ---------------------------------------------------------
>                 Key: HBASE-21070
>                 URL: https://issues.apache.org/jira/browse/HBASE-21070
>             Project: HBase
>          Issue Type: Bug
>          Components: snapshots
>    Affects Versions: 3.0.0, 2.1.1, 1.4.7
>            Reporter: Zach York
>            Assignee: Zach York
>            Priority: Critical
>         Attachments: HBASE-21070.master.001.patch
> The SnapshotFileCache depends on last modified time to determine whether to 
> update the Snapshot HFile cache. However, in S3, real 'folders' don't exist. 
> S3 filesystems create a dummy file in place of a folder, but the dummy file 
> last modified time is not updated when files are changed 'under' it. This 
> means that the SnapshotFileCache doesn't pick up new snapshot HFiles and 
> these files aren't removed from the HFileCleaner and can be eligible for 
> deletion.
> My patch removes the lastmodified assumption.

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