[jira] [Updated] (HBASE-11360) SnapshotFileCache causes too many cache refreshes

["Lars Hofhansl (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-11360?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Lars Hofhansl updated HBASE-11360:
----------------------------------

    Summary: SnapshotFileCache causes too many cache refreshes  (was: SnapshotFileCache refresh logic based on modified directory time might be insufficient)

> SnapshotFileCache causes too many cache refreshes
> -------------------------------------------------
>
>                 Key: HBASE-11360
>                 URL: https://issues.apache.org/jira/browse/HBASE-11360
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.94.19
>            Reporter: churro morales
>             Fix For: 0.99.0, 0.98.5, 0.94.22
>
>         Attachments: 11360-0.98.txt, HBASE-11360-0.94.patch, HBASE-11360-0.96.patch
>
>
> Right now we decide whether to refresh the cache based on the lastModified timestamp of all the snapshots and those "running" snapshots which is located in the /hbase/.hbase-snapshot/.tmp/<snapshot> directory
> We ran a ExportSnapshot job which takes around 7 minutes between creating the directory and copying all the files. 
> Thus the modified time for the 
> /hbase/.hbase-snapshot/.tmp directory was 7 minutes earlier than the modified time of the
> /hbase/.hbase-snapshot/.tmp/<snapshot> directory
> Thus the cache refresh happens and doesn't pick up all the files but thinks its up to date as the modified time of the .tmp directory never changes.
> This is a bug as when the export job starts the cache never contains the files for the "running" snapshot and will fail.



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