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From "Jonathan Ellis (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1278) Make bulk loading into Cassandra less crappy, more pluggable
Date Fri, 28 Jan 2011 20:56:46 GMT


Jonathan Ellis commented on CASSANDRA-1278:

For what it's worth, Matt and I discussed 3 options for the serialization format:

1. a custom format
2. thrift
3. native ColumnSerializer format

1. has little to recommend it.  We have enough serialization formats already.

2. has the benefit of being cross-platform out of the box.

3. is obviously going to be fastest, especially if you require rows to be in sorted order
so you can basically stream directly to an sstable data file.

Neither 2. nor 3. is inherently unreasonable; the question is whether we can get to "fast
enough" with 2.  That's a question we couldn't answer without building it.

> Make bulk loading into Cassandra less crappy, more pluggable
> ------------------------------------------------------------
>                 Key: CASSANDRA-1278
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Jeremy Hanna
>            Assignee: Matthew F. Dennis
>             Fix For: 0.7.2
>         Attachments: 1278-cassandra-0.7.txt
>   Original Estimate: 40h
>          Time Spent: 40.67h
>  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 -  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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