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From "Nick Bailey (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1898) json2sstable should support streaming
Date Thu, 13 Jan 2011 22:50:48 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981532#action_12981532
] 

Nick Bailey commented on CASSANDRA-1898:
----------------------------------------

Well I think we should at least log a message that they may want to do it manually. Besides
that +1.

> json2sstable should support streaming
> -------------------------------------
>
>                 Key: CASSANDRA-1898
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1898
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Tools
>            Reporter: Nick Bailey
>            Assignee: Pavel Yaskevich
>             Fix For: 0.7.1
>
>         Attachments: CASSANDRA-1898-v2.patch, CASSANDRA-1898-v3.patch, CASSANDRA-1898.patch
>
>   Original Estimate: 8h
>          Time Spent: 8h
>  Remaining Estimate: 0h
>
> json2sstable loads the entire json file into memory. This is so it can sort the file
before creating an sstable. If the file was created using sstable2json and the partitioner
isn't changing, this isn't necessary.  For very large files this means json2sstable requires
a huge amount of memory.
> There should be an option to stream the file. A simple check for out of order keys will
prevent writing bad sstables.
> This should be possible with the SAX style parser available in our current json library.

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