[jira] [Commented] (CASSANDRA-9766) Bootstrap outgoing streaming speeds are much slower than during repair

["Eric Evans (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-9766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15149229#comment-15149229 ] 

Eric Evans commented on CASSANDRA-9766:
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I'm seeing something similar here; I get an eerily consistent 4.5MB/s _per stream_, (much less than the stream throughput limit, and the capability of the network).  We have large partitions, large SSTables, and a mixture of 256k and 512k chunk lengths.

[~yukim] what would be the best test of this, would https://gist.github.com/eevans/81f02849eab7634871c9 do?

> Bootstrap outgoing streaming speeds are much slower than during repair
> ----------------------------------------------------------------------
>
>                 Key: CASSANDRA-9766
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9766
>             Project: Cassandra
>          Issue Type: Bug
>         Environment: Cassandra 2.1.2. more details in the pdf attached 
>            Reporter: Alexei K
>             Fix For: 2.1.x
>
>         Attachments: problem.pdf
>
>
> I have a cluster in Amazon cloud , its described in detail in the attachment. What I've noticed is that we during bootstrap we never go above 12MB/sec transmission speeds and also those speeds flat line almost like we're hitting some sort of a limit ( this remains true for other tests that I've ran) however during the repair we see much higher,variable sending rates. I've provided network charts in the attachment as well . Is there an explanation for this? Is something wrong with my configuration, or is it a possible bug?



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