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https://issues.apache.org/jira/browse/HIVE-6229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13944371#comment-13944371
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Lefty Leverenz commented on HIVE-6229:
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*hive.stats.key.prefix.reserve.length* is now documented in the wiki, but its
description needs review and clarification:
{quote}
Reserved length for postfix of statistics key. Currently only meaningful for
counter type statistics which should keep the length of the full statistics key
smaller than the maximum length configured by hive.stats.key.prefix.max.length.
For counter type statistics, it should be bigger than the length of LB spec if
exists.
{quote}
What does "LB spec" mean? All I could find by googling was the Ljung–Box test.
Does "if exists" mean "if the LB spec exists"? And what is "it" in "it should
be bigger" -- this parameter's setting or the length of the full statistics key?
* [Configuration Properties: hive.stats.key.prefix.reserve.length
|https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties#ConfigurationProperties-hive.stats.key.prefix.reserve.length]
> Stats are missing sometimes (regression from HIVE-5936)
> -------------------------------------------------------
>
> Key: HIVE-6229
> URL: https://issues.apache.org/jira/browse/HIVE-6229
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Reporter: Navis
> Assignee: Navis
> Fix For: 0.13.0
>
> Attachments: HIVE-6229.1.patch.txt, HIVE-6229.2.patch.txt
>
>
> if prefix length is smaller than hive.stats.key.prefix.max.length but length
> of prefix + postfix is bigger than that, stats are missed.
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