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

["Janus Chow (Jira)" <ji...@apache.org>]

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

Janus Chow updated HDDS-9222:
-----------------------------
       Fix Version/s:     (was: 1.4.0)
    Target Version/s: 1.5.0

I am managing the 1.4.0 release and we currently have more than 500 issues targeted for 1.4.0. I am moving the target field to 1.5.0.
       
If you are actively working on this jira and believe this should be targeted for the 1.4.0 release, Please reach out to me via Apache email or Slack.

> 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
>         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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