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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-14098) AliyunOSS: improve the performance of object metadata operation
Date Thu, 19 Oct 2017 09:45:00 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-14098?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16210796#comment-16210796
] 

Steve Loughran commented on HADOOP-14098:
-----------------------------------------

My view? 

# It's a major piece of work & you are going to need to recruit people to collaborate
on & review
# some of the metastore design was always intended to be neutral of back end, but we didn't
follow it all the way through

See what [~fabbri], [~mackrorysd], [~cnauroth] & [~liuml07] have to say on the matter.

Based on the TCP-DS benchmarking we've done in the past, speeding up the read pipeline through
seek optimisation has the biggest benefits, then incremental writes of data. metadata caching
&c boosts query setup irrespective of destination, while faster commiters stop the job
commit process being an O(data) thing. I'd make sure the read/write code was fast first. Take
a look at wasb's latest work there, where it works out from the seek patten whether you want
to switch to random IO or not: on the first backwards seek it changes mode

> AliyunOSS: improve the performance of object metadata operation
> ---------------------------------------------------------------
>
>                 Key: HADOOP-14098
>                 URL: https://issues.apache.org/jira/browse/HADOOP-14098
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: fs
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Genmao Yu
>            Assignee: Genmao Yu
>
> Open this JIRA to research and address the potential request performance issue.



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