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From "Alexey Zotov (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-4769) Prevent parallel hint delivery to the node
Date Fri, 05 Oct 2012 19:32:02 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-4769?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470583#comment-13470583
] 

Alexey Zotov commented on CASSANDRA-4769:
-----------------------------------------

Yes, it's the simplest way. But what's about the following use case:
There are N remote data centers. Each data center sends hints to restored node. So that node
will receive throttle_in_kb*N*Nrf of data per second. (Nrf - replication factor in Nth data
center)
You could reduce throttle threshold, but in case of local node very small threshold is not
a very good idea. 

I think that mechanism shoud be more configurable.
                
> Prevent parallel hint delivery to the node 
> -------------------------------------------
>
>                 Key: CASSANDRA-4769
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-4769
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.1.2
>            Reporter: Alexey Zotov
>
> It's actual only in case of the using a big enough cluster. After node's failure other
nodes try to send hints to the restored node. So theoretically it can affect performance of
restored node. 
> I suggest to create some mechanism for synchronization of hints delivery processes to
restored node.
> Could you please explain how it can be implemented.

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