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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-13029) NVDIMM support for LLAP Cache
Date Wed, 18 May 2016 03:28:13 GMT

    [ https://issues.apache.org/jira/browse/HIVE-13029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15288147#comment-15288147
] 

Gopal V commented on HIVE-13029:
--------------------------------

Should go in this week, I'll rebase the patch and run another test run with a ~2x > RAM
cache.

> NVDIMM support for LLAP Cache
> -----------------------------
>
>                 Key: HIVE-13029
>                 URL: https://issues.apache.org/jira/browse/HIVE-13029
>             Project: Hive
>          Issue Type: New Feature
>          Components: llap
>    Affects Versions: 2.1.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Critical
>         Attachments: HIVE-13029.1.patch, HIVE-13029.2.patch
>
>
> LLAP cache has been designed so that the cache can be offloaded easily to a pmem API
without restart coherence.
> The tricky part about NVDIMMs are restart coherence, while most of the cache gains can
be obtained without keeping state across refreshes, since LLAP is not the system of record,
HDFS is.



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