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Posted to dev@hive.apache.org by "Lefty Leverenz (JIRA)" <ji...@apache.org> on 2014/09/14 06:17:34 UTC
[jira] [Commented] (HIVE-860) Persistent distributed cache
[ https://issues.apache.org/jira/browse/HIVE-860?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14133073#comment-14133073 ]
Lefty Leverenz commented on HIVE-860:
-------------------------------------
Did this fall by the wayside?
> 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, 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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