[jira] [Commented] (HIVE-6500) Stats collection via filesystem

["Lefty Leverenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-6500?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14003107#comment-14003107 ] 

Lefty Leverenz commented on HIVE-6500:
--------------------------------------

Unfortunately my review board advice not to patch hive-default.xml.template led to release 0.13.0 having the obsolete default value for *hive.stats.dbclass* in the template file.  But it's updated in the most recent patch for HIVE-6037, so presumably it will be corrected by release 0.14.0.

Sorry about that.

> Stats collection via filesystem
> -------------------------------
>
>                 Key: HIVE-6500
>                 URL: https://issues.apache.org/jira/browse/HIVE-6500
>             Project: Hive
>          Issue Type: New Feature
>          Components: Statistics
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>             Fix For: 0.13.0
>
>         Attachments: HIVE-6500.2.patch, HIVE-6500.3.patch, HIVE-6500.patch
>
>
> Recently, support for stats gathering via counter was [added | https://issues.apache.org/jira/browse/HIVE-4632] Although, its useful it has following issues:
> * [Length of counter group name is limited | https://github.com/apache/hadoop-common/blob/branch-2.3/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java?source=c#L340]
> * [Length of counter name is limited | https://github.com/apache/hadoop-common/blob/branch-2.3/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java?source=c#L337]
> * [Number of distinct counter groups are limited | https://github.com/apache/hadoop-common/blob/branch-2.3/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java?source=c#L343]
> * [Number of distinct counters are limited | https://github.com/apache/hadoop-common/blob/branch-2.3/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/MRJobConfig.java?source=c#L334]
> Although, these limits are configurable, but setting them to higher value implies increased memory load on AM and job history server.
> Now, whether these limits makes sense or not is [debatable | https://issues.apache.org/jira/browse/MAPREDUCE-5680] it is desirable that Hive doesn't make use of counters features of framework so that it we can evolve this feature without relying on support from framework. Filesystem based counter collection is a step in that direction.



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