[jira] [Work logged] (HADOOP-16830) Add public IOStatistics API

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HADOOP-16830?focusedWorklogId=524590&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-524590 ]

ASF GitHub Bot logged work on HADOOP-16830:
-------------------------------------------

                Author: ASF GitHub Bot
            Created on: 15/Dec/20 17:53
            Start Date: 15/Dec/20 17:53
    Worklog Time Spent: 10m 
      Work Description: steveloughran commented on pull request #2323:
URL: https://github.com/apache/hadoop/pull/2323#issuecomment-745459150


   Closing as nobody was reviewing this and its impossible to maintain the interface and impl branches. The combined -common and -aws changes make for a bigger pr, but each patch has gone in separately, It will be possible to merge the changes into Hadoop as two separate patches 


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 524590)
    Time Spent: 8h 40m  (was: 8.5h)

> Add public IOStatistics API
> ---------------------------
>
>                 Key: HADOOP-16830
>                 URL: https://issues.apache.org/jira/browse/HADOOP-16830
>             Project: Hadoop Common
>          Issue Type: New Feature
>          Components: fs, fs/s3
>    Affects Versions: 3.3.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 8h 40m
>  Remaining Estimate: 0h
>
> 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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