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Posted to common-issues@hadoop.apache.org by "Mukund Thakur (Jira)" <ji...@apache.org> on 2020/04/24 09:54:00 UTC
[jira] [Commented] (HADOOP-16830) Add public IOStatistics API; S3A
to collect and report across threads
[ https://issues.apache.org/jira/browse/HADOOP-16830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17091406#comment-17091406 ]
Mukund Thakur commented on HADOOP-16830:
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A flow/design diagram (both old and new) would really help in understanding the changes and reasonn behind the whole new implementation. Thanks.
> Add public IOStatistics API; S3A to collect and report across threads
> ---------------------------------------------------------------------
>
> Key: HADOOP-16830
> URL: https://issues.apache.org/jira/browse/HADOOP-16830
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs, fs/s3
> Affects Versions: 3.3.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
>
> Applications like to collect the statistics which specific operations take, by collecting exactly those operations done during the execution of FS API calls by their individual worker threads, and returning these to their job driver
> * S3A has a statistics API for some streams, but it's a non-standard one; Impala &c can't use it
> * FileSystem storage statistics are public, but as they aren't cross-thread, they don't aggregate properly
> Proposed
> # A new IOStatistics interface to serve up statistics
> # S3A to implement
> # other stores to follow
> # Pass-through from the usual wrapper classes (FS data input/output streams)
> It's hard to think about how best to offer an API for operation context stats, and how to actually implement.
> ThreadLocal isn't enough because the helper threads need to update on the thread local value of the instigator
> My Initial PoC doesn't address that issue, but it shows what I'm thinking of
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