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From "Stu Hood (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1278) Make bulk loading into Cassandra less crappy, more pluggable
Date Fri, 29 Apr 2011 09:36:03 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026918#comment-13026918
] 

Stu Hood commented on CASSANDRA-1278:
-------------------------------------

Very interesting work here!

* Did you accidentally remove the buffering for non-streaming connections in IncomingTCPConnection?
* What kind of failures are supported during a load? What's the proper behavior for flush_proxy
when some hosts fail?
* Could we avoid coding in knowledge of the file format in the inner loop of IncomingLoaderStreamReader?
I would much, much prefer that non-file-format-specific framing be added, and it would have
the added benefit of not requiring as many system calls (4 per row vs 2 per frame)
* What is the benefit of using an independent protocol for "Loader" streams?

Again, awesome.

> Make bulk loading into Cassandra less crappy, more pluggable
> ------------------------------------------------------------
>
>                 Key: CASSANDRA-1278
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1278
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jeremy Hanna
>            Assignee: Matthew F. Dennis
>             Fix For: 0.8.1
>
>         Attachments: 1278-cassandra-0.7-v2.txt, 1278-cassandra-0.7.1.txt, 1278-cassandra-0.7.txt
>
>   Original Estimate: 40h
>          Time Spent: 40h 40m
>  Remaining Estimate: 0h
>
> Currently bulk loading into Cassandra is a black art.  People are either directed to
just do it responsibly with thrift or a higher level client, or they have to explore the contrib/bmt
example - http://wiki.apache.org/cassandra/BinaryMemtable  That contrib module requires delving
into the code to find out how it works and then applying it to the given problem.  Using either
method, the user also needs to keep in mind that overloading the cluster is possible - which
will hopefully be addressed in CASSANDRA-685
> This improvement would be to create a contrib module or set of documents dealing with
bulk loading.  Perhaps it could include code in the Core to make it more pluggable for external
clients of different types.
> It is just that this is something that many that are new to Cassandra need to do - bulk
load their data into Cassandra.

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