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From "David Alves (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-1337) parallelize fetching rows for low-cardinality indexes
Date Fri, 27 Jul 2012 19:10:35 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424071#comment-13424071
] 

David Alves edited comment on CASSANDRA-1337 at 7/27/12 7:09 PM:
-----------------------------------------------------------------

patch that addresses the bugs raised by sylvain. (StoragProxyTest and cql_test.py both pass)
namely:
- local path counts as one less handler
- enough check moved out of the remote branch
- estimatedKeysPerRange take into account replication factor
- columns.maxIsColumns sets concurrency to 1

still working on the dtest that proves (or disproves that this works)

I'd like to move the rest of the issues raised by sylvain to another ticket.
                
      was (Author: dr-alves):
    patch that addresses the bugs raised by sylvain. (StoragProxyTest and cql_test.py both
pass) namely:
- local path counts as one less handler
- enough check moved out of the remote branch
- estimatedKeysPerRange take into account replication factor
- columns.maxIsColumns sets concurrency to 1

still working on the dtest that proves (or disproves that this works) but both StorageProxyTest
and the regression test created by Sylvain pass

I'd like to move the rest of the issues raised by sylvain to another ticket.
                  
> 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
>            Assignee: David Alves
>             Fix For: 1.2
>
>         Attachments: 0001-CASSANDRA-1337-scan-concurrently-depending-on-num-rows.txt,
1137-bugfix.patch, CASSANDRA-1337.patch
>
>   Original Estimate: 8h
>  Remaining Estimate: 8h
>
> 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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