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From "Sean Mackrory (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-14020) Optimize dirListingUnion
Date Wed, 25 Jan 2017 19:02:26 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-14020?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Sean Mackrory updated HADOOP-14020:
-----------------------------------
    Status: Patch Available  (was: Open)

> Optimize dirListingUnion
> ------------------------
>
>                 Key: HADOOP-14020
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14020
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs/s3
>            Reporter: Sean Mackrory
>            Assignee: Sean Mackrory
>         Attachments: HADOOP-14020-HADOOP-13345.001.patch, HADOOP-14020-HADOOP-13345.002.patch
>
>
> There's a TODO in dirListingUnion:
> {quote}// TODO optimize for when allowAuthoritative = false{quote}
> There will be cases when we can intelligently avoid a round trip: if S3A results are
a subset or the metadatastore results (including them being equal or empty) then writing back
will do nothing (although perhaps that should set the authoritative flag if it isn't set already).
> There may also be cases where users want to just skip that altogether. It's wasted work
if authoritative mode is disabled, so perhaps we want to trigger a skip if that's false, or
perhaps it should be a separate property. First one makes for simpler config, second is more
flexible...



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