[jira] [Resolved] (HADOOP-16830) Add Public IOStatistics API

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[jira] [Resolved] (HADOOP-16830) Add Public IOStatistics API

Steve Loughran (Jira)

     [ https://issues.apache.org/jira/browse/HADOOP-16830?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steve Loughran resolved HADOOP-16830.
    Fix Version/s: 3.3.1
       Resolution: Fixed

Done. Created HADOOP-17469 for followup

> 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
>             Fix For: 3.3.1
>          Time Spent: 11.5h
>  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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