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From "Stefania (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9318) Bound the number of in-flight requests at the coordinator
Date Fri, 15 Jul 2016 03:07:20 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378784#comment-15378784
] 

Stefania commented on CASSANDRA-9318:
-------------------------------------

I don't have much to add regarding the merits of one approach vs. the other, other than to
say that I agree with [~slebresne] that we should implement the strategy API so that both
strategies can be supported, and this will make it more likely that the API is fit for even
more strategies. I would even go one step further and suggest that the second strategy should
be relatively easy to implement if the framework is in place and if we can work out a reasonable
threshold. Therefore we could consider implementing and testing both, either as part of a
follow up ticket or this one.

Another thing I would like to point out is that, once we make read and write requests fully
non-blocking, either via CASSANDRA-10993 or CASSANDRA-10528, we will probably have to rethink
this.

> 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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