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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2016/06/10 10:40:21 UTC
[jira] [Commented] (HADOOP-12876) [Azure Data Lake] Support for
process level FileStatus cache to optimize GetFileStatus frequent opeations
[ https://issues.apache.org/jira/browse/HADOOP-12876?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15324265#comment-15324265 ]
Steve Loughran commented on HADOOP-12876:
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# Would this be per FS instance, or across all instances? Because the latter, even though nominally more efficient if there is >1 FS against the same URI, has some security implications on any service fielding requests from >1 principal.
# Guava has a cache with eviction policies; I'd go with that unless it was fundamentally broken
# Making it generic to filesystems would allow use elsewhere (Swift, S3a), as well as isolated testing
# would there be cache invalidation after file/directory operations?
> [Azure Data Lake] Support for process level FileStatus cache to optimize GetFileStatus frequent opeations
> ---------------------------------------------------------------------------------------------------------
>
> Key: HADOOP-12876
> URL: https://issues.apache.org/jira/browse/HADOOP-12876
> Project: Hadoop Common
> Issue Type: Improvement
> Components: fs, fs/azure, tools
> Reporter: Vishwajeet Dusane
> Assignee: Vishwajeet Dusane
>
> Add support to cache GetFileStatus and ListStatus response locally for limited period of time. Local cache for limited period of time would optimize number of calls for GetFileStatus operation.
> One of the example where local limited period cache would be useful - terasort ListStatus on input directory follows with GetFileStatus operation on each file within directory. For 2048 input files in a directory would save 2048 GetFileStatus calls during start up (Using the ListStatus response to cache FileStatus instances).
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