[jira] [Resolved] (HDDS-9222) Write chunk cache blocking ratis for slow follower

["Tsz-wo Sze (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDDS-9222?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz-wo Sze resolved HDDS-9222.
------------------------------
    Fix Version/s: 1.4.0
       Resolution: Fixed

The pull request is now merged.  Thanks, [~sumitagrawl]!

> Write chunk cache blocking ratis for slow follower
> --------------------------------------------------
>
>                 Key: HDDS-9222
>                 URL: https://issues.apache.org/jira/browse/HDDS-9222
>             Project: Apache Ozone
>          Issue Type: Improvement
>          Components: Ozone Datanode
>            Reporter: Sumit Agrawal
>            Assignee: Sumit Agrawal
>            Priority: Major
>              Labels: proton
>             Fix For: 1.4.0
>
>         Attachments: DN cache.docx
>
>
> writeChunk when try to add to cache is blocking, as cache might be full. This can happen,
>  * follower DN is very slow
>  * follower DN is down
> Under this situation, close container and pipeline will be stuck for the ratis is its blocked.
>  
> As part of this, need write chunk being throttled, either,
>  * rejecting request
>  * OR going ahead without cache – Need handle parallel readChunk which can fail in this scenario (HDDS-2542 - handle this scenario with certain limitation)
>  



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