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https://issues.apache.org/jira/browse/CASSANDRA-5036?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-5036:
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Assignee: Marcus Eriksson
> Wrong description of 'setstreamthroughput' option
> -------------------------------------------------
>
> Key: CASSANDRA-5036
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5036
> Project: Cassandra
> Issue Type: Bug
> Components: Config, Documentation & website
> Affects Versions: 1.1.6
> Environment: Cassandra 1.1.6 (DataStax distribution)
> Reporter: Alexey Zotov
> Assignee: Marcus Eriksson
> Priority: Trivial
>
> There is a typo in description of 'setstreamthroughput' option. It is
> measured in megabits per second. Page with wrong description:
> http://www.datastax.com/docs/1.1/references/nodetool#nodetool-setstreamthroughput
> Page with right description:
> http://www.datastax.com/docs/1.1/configuration/node_configuration#stream-throughput-outbound-megabits-per-sec
> Also I want to discuss possibility to reduce default value for this option. I
> think that 400 Mbs is too high for common cases.
> Preface:
> This option is used only in case streams. There are two cases when streams
> are actual. They are rebuilding of a node and repair process. Let's skip
> first case and will talk only about the second. Let's imagine that we have
> replication factor 3.
> Cross-datacenter connectivity case:
> When we start repair process it will borrow all network channel. Let's do
> some calculations. You start repair on an one node, e.g. 5 node (3 remote and
> 2 local) should send us some data. Note that 3 of them are from remote
> datacenter. So 400 * 3 = 1,2 Gbs we should receive through WAN. I'm sure that
> it's too high.
> I suggest to make it 2 times less.
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