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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-9318) Bound the number of in-flight requests at the coordinator
Date Mon, 29 Jun 2015 16:11:06 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9318?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14605817#comment-14605817
] 

Jonathan Ellis edited comment on CASSANDRA-9318 at 6/29/15 4:11 PM:
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https://issues.apache.org/jira/browse/CASSANDRA-9318?focusedCommentId=14604775&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14604775

bq. [It is not] a good idea to try to allow extra reads when write capacity is full or vice
versa. They both ultimately use the same resources (cpu, heap, disk i/o).


was (Author: jbellis):
https://issues.apache.org/jira/browse/CASSANDRA-9318?focusedCommentId=14604775&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14604775

> [It is not] a good idea to try to allow extra reads when write capacity is full or vice
versa. They both ultimately use the same resources (cpu, heap, disk i/o).

> 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
>            Reporter: Ariel Weisberg
>            Assignee: Ariel Weisberg
>             Fix For: 2.1.x, 2.2.x
>
>
> 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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