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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1337) parallelize fetching rows for low-cardinality indexes
Date Sat, 18 Sep 2010 07:26:33 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12910911#action_12910911
] 

Jonathan Ellis commented on CASSANDRA-1337:
-------------------------------------------

(StorageProxy.scan is the code in question.)

> parallelize fetching rows for low-cardinality indexes
> -----------------------------------------------------
>
>                 Key: CASSANDRA-1337
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1337
>             Project: Cassandra
>          Issue Type: Improvement
>            Reporter: Jonathan Ellis
>            Priority: Minor
>             Fix For: 0.7.1
>
>
> currently, we read the indexed rows from the first node (in partitioner order); if that
does not have enough matching rows, we read the rows from the next, and so forth.
> we should use the statistics fom CASSANDRA-1155 to query multiple nodes in parallel,
such that we have a high chance of getting enough rows w/o having to do another round of queries
(but, if our estimate is incorrect, we do need to loop and do more rounds until we have enough
data or we have fetched from each node).

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