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https://issues.apache.org/jira/browse/HIVE-2408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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John Sichi updated HIVE-2408:
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Component/s: (was: HBase Handler)
Query Processor
> Perpetually degrading performance in checkPaths
> -----------------------------------------------
>
> Key: HIVE-2408
> URL: https://issues.apache.org/jira/browse/HIVE-2408
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.7.1, 0.8.0
> Reporter: Grisha Trubetskoy
>
> In ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java, checkPaths()
> tacks on a copy_N if a file exists, working its way up until an available
> file name is found. The problem is that the exists() check is quite expensive
> in HDFS, and if you have hundreds of files to go through this becomes a
> serious bottleneck.
> A better solution would be to use a timestamp in the file name, then followed
> by the "copy_N scheme".
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