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From "Stefania (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9766) Bootstrap outgoing streaming speeds are much slower than during repair
Date Wed, 04 May 2016 04:20:12 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9766?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15270101#comment-15270101
] 

Stefania commented on CASSANDRA-9766:
-------------------------------------

Thanks for the modifications.

It LGTM now, I just have two small suggestions and some nits:

* In {{ColumnIndex}} a method to reset the properties that change would have been enough,
no need to pass in every time {{header, dataFile, descriptor.version, observers}} and probably
not even {{getRowIndexEntrySerializer().indexInfoSerializer()}}. This way these fields can
return to be final.  
* In BTW, {{columnIndexWriter}} can be created in the constructor so it too can be final.

* Nit: {{indexSamples}} in {{ColumnIndex}} can be final.
* Nit: unused import in {{CompressedInputStream}}: {{java.util.zip.Checksum}}
* Nit: we can restore {{import java.util.\*}} in BTreeSet.java and {{import java.util.concurrent.\*}}
in BufferPool.java

CI looks good as well:
* the 3 failing dtests also fail on trunk
* the failing utests are all timeouts except for one which also fails on trunk. The tests
with timeout pass locally and there are timeouts on trunk too.


> 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: Improvement
>          Components: Streaming and Messaging
>         Environment: Cassandra 2.1.2. more details in the pdf attached 
>            Reporter: Alexei K
>            Assignee: T Jake Luciani
>              Labels: performance
>             Fix For: 3.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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