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Date: Thu, 13 Jan 2011 16:10:48 -0500 (EST)
From: "Pavel Yaskevich (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Subject: [jira] Commented: (CASSANDRA-1898) json2sstable should support
 streaming
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    [ https://issues.apache.org/jira/browse/CASSANDRA-1898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12981487#action_12981487 ] 

Pavel Yaskevich commented on CASSANDRA-1898:
--------------------------------------------

v3 patch supports it.

> 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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