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From "Ferdinand Xu (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-860) Persistent distributed cache
Date Mon, 01 Dec 2014 11:15:14 GMT

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

Ferdinand Xu updated HIVE-860:
------------------------------
    Attachment: HIVE-860.4.patch

> 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: Ferdinand Xu
>             Fix For: 0.15.0
>
>         Attachments: HIVE-860.1.patch, HIVE-860.2.patch, HIVE-860.2.patch, HIVE-860.3.patch,
HIVE-860.4.patch, HIVE-860.patch, HIVE-860.patch, HIVE-860.patch, 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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