[jira] [Resolved] (HDDS-12951) EC: Add a metric or log when readers falling back to reconstructional reads in EC

["Attila Doroszlai (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-12951?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Attila Doroszlai resolved HDDS-12951.
-------------------------------------
    Fix Version/s: 2.1.0
       Resolution: Implemented

> EC: Add a metric or log when readers falling back to reconstructional reads in EC
> ---------------------------------------------------------------------------------
>
>                 Key: HDDS-12951
>                 URL: https://issues.apache.org/jira/browse/HDDS-12951
>             Project: Apache Ozone
>          Issue Type: Improvement
>            Reporter: Uma Maheswara Rao G
>            Assignee: Szabolcs Gál
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 2.1.0
>
>
> In EC reads, we will fall back to online reconstructional reads when there are failures in the happy path read ( no failures from any DN when reading). 
> This involves decoding the failed stripes by reading parity replicas. Users may want to correlate whether the read overheads are due to online reconstruction or something else. So, it would be good to provide some metrics or logging to indicate the readers are switching to reconstructional reads.  
> This JIRA analyzes those read paths and makes sure we have enough trace information to correlate. 



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