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https://issues.apache.org/jira/browse/HIVE-12995?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15197014#comment-15197014
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Lefty Leverenz commented on HIVE-12995:
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Doc note: This adds configuration parameter
*hive.orc.splits.allow.synthetic.fileid* to HiveConf.java, so it will need to
be documented in the ORC section of Configuration Properties for release 2.1.0.
* [Configuration Properties -- ORC File Format |
https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-ORCFileFormat]
Should it also be mentioned in the llap documentation? (The parameter
description doesn't say anything about llap.)
* [LLAP design document |
https://issues.apache.org/jira/secure/attachment/12665704/LLAPdesigndocument.pdf]
attached to HIVE-7926
> LLAP: Synthetic file ids need collision checks
> ----------------------------------------------
>
> Key: HIVE-12995
> URL: https://issues.apache.org/jira/browse/HIVE-12995
> Project: Hive
> Issue Type: Bug
> Components: llap
> Affects Versions: 2.1.0
> Reporter: Gopal V
> Assignee: Sergey Shelukhin
> Labels: TODOC2.1
> Fix For: 2.1.0
>
> Attachments: HIVE-12995.01.patch, HIVE-12995.02.patch,
> HIVE-12995.03.patch, HIVE-12995.04.patch, HIVE-12995.patch
>
>
> LLAP synthetic file ids do not have any way of checking whether a collision
> occurs other than a data-error.
> Synthetic file-ids have only been used with unit tests so far - but they will
> be needed to add cache mechanisms to non-HDFS filesystems.
> In case of Synthetic file-ids, it is recommended that we track the full-tuple
> (path, mtime, len) in the cache so that a cache-hit for the synthetic file-id
> can be compared against the parameters & only accepted if those match.
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