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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-1278) Make bulk loading into Cassandra less crappy, more pluggable
Date Thu, 19 May 2011 20:55:48 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1278?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036451#comment-13036451
] 

Jonathan Ellis commented on CASSANDRA-1278:
-------------------------------------------

bq. It'd be nice if it printed the filename and the time it took for each time, since just
having the percentages reset is a bit confusing

Part of me likes that idea, but it might be dangerous to print a filename and have the user
assume it's "done," when in reality it only has the data component streamed (with the rest
pending rebuild on the target) so if the target is killed & reset the tmp data file will
just be deleted.

> 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: Sylvain Lebresne
>             Fix For: 0.8.1
>
>         Attachments: 0001-Add-bulk-loader-utility.patch, 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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