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From "Chris Goffinet (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-579) Add support to io.Streaming API for sending Streams
Date Thu, 17 Dec 2009 04:06:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791771#action_12791771
] 

Chris Goffinet commented on CASSANDRA-579:
------------------------------------------

We see about 16MB/s for compaction on a 4 disk RAID0 configuration. Moving this directly to
network, so we can be network bound would be much better. But the thing is, compaction is
running slower than the max throughput on network, which is roughly 80MB/s on our systems.

> Add support to io.Streaming API for sending Streams
> ---------------------------------------------------
>
>                 Key: CASSANDRA-579
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-579
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Stu Hood
>             Fix For: 0.9
>
>
> The io.Streaming API currently requires a file on disk to stream, which means that bootstrap
and repairs need to perform an anti-compaction that writes a bunch of data to disk, only to
have it be deleted after the streaming has finished.
> Ideally, the Streaming API should allow for streaming from an InputStream (or any other
class we think we need to design to make the streaming as efficient as possible). That way,
anti-compaction for repair/bootstrap does not perform any writing: it simply streams the relevant
portion of the file to the neighbor.
> Additionally, this opens up interesting possibilities, such as providing the Streaming
API as a (Java only?) client API. One use case would be for a Hadoop OutputFormat: rather
than writing BinaryMemtables, the OutputFormat could literally write an SSTable to the stream.
This might require better integration with gossip, to ensure that you aren't writing to the
completely wrong node.

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