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From "Sergio Bossa (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9318) Bound the number of in-flight requests at the coordinator
Date Wed, 14 Sep 2016 06:59:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15489629#comment-15489629
] 

Sergio Bossa commented on CASSANDRA-9318:
-----------------------------------------

bq. queryStartNanoTime was introduced by CASSANDRA-12256

Yep, I was just looking at that.

bq. Should we increase the timeout by the amount of time spent waiting for the backpressure
strategy

Yes, this seems the best solution, plus documenting it, that is the fact that with back-pressure
enabled the time spent paused in back-pressure is not counted against.

bq. Also, it should not be changed if the backpressure strategy is disabled.

I changed it regardless in the previous solution for consistency, but I agree that post CASSANDRA-12256
it should be changed only in case of back-pressure.

> Bound the number of in-flight requests at the coordinator
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-9318
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9318
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Local Write-Read Paths, Streaming and Messaging
>            Reporter: Ariel Weisberg
>            Assignee: Sergio Bossa
>         Attachments: 9318-3.0-nits-trailing-spaces.patch, backpressure.png, limit.btm,
no_backpressure.png
>
>
> It's possible to somewhat bound the amount of load accepted into the cluster by bounding
the number of in-flight requests and request bytes.
> An implementation might do something like track the number of outstanding bytes and requests
and if it reaches a high watermark disable read on client connections until it goes back below
some low watermark.
> Need to make sure that disabling read on the client connection won't introduce other
issues.



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