[jira] [Updated] (HIVE-860) Persistent distributed cache

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     [ https://issues.apache.org/jira/browse/HIVE-860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Navis updated HIVE-860:
-----------------------

    Fix Version/s:     (was: 0.13.0)
                   0.14.0

> Persistent distributed cache
> ----------------------------
>
>                 Key: HIVE-860
>                 URL: https://issues.apache.org/jira/browse/HIVE-860
>             Project: Hive
>          Issue Type: Improvement
>    Affects Versions: 0.12.0
>            Reporter: Zheng Shao
>            Assignee: Brock Noland
>             Fix For: 0.14.0
>
>         Attachments: HIVE-860.patch, HIVE-860.patch, HIVE-860.patch, HIVE-860.patch, HIVE-860.patch, HIVE-860.patch, HIVE-860.patch, HIVE-860.patch
>
>
> DistributedCache is shared across multiple jobs, if the hdfs file name is the same.
> We need to make sure Hive put the same file into the same location every time and do not overwrite if the file content is the same.
> We can achieve 2 different results:
> A1. Files added with the same name, timestamp, and md5 in the same session will have a single copy in distributed cache.
> A2. Filed added with the same name, timestamp, and md5 will have a single copy in distributed cache.
> A2 has a bigger benefit in sharing but may raise a question on when Hive should clean it up in hdfs.



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