[jira] Updated: (CASSANDRA-1156) support querying multiple nodes for index scan

["Jonathan Ellis (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-1156?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis updated CASSANDRA-1156:
--------------------------------------

    Attachment: 0001-update-thrift.txt
                0002-handle-index-scans-across-multiple-nodes-and-consisten.txt

> support querying multiple nodes for index scan
> ----------------------------------------------
>
>                 Key: CASSANDRA-1156
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1156
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Jonathan Ellis
>             Fix For: 0.7 beta 1
>
>         Attachments: 0001-update-thrift.txt, 0002-handle-index-scans-across-multiple-nodes-and-consisten.txt
>
>
> given CASSANDRA-1155, we should query multiple nodes for the rows corresponding to the given index criteria, such that we have a 90% chance of getting enough rows w/o having to do another query (but, if our estimate is incorrect, we do need to loop and do a 2nd query).
> we start with the first node in token order, so that we only have to query a single node for low cardinality (i.e., every index value has many rows associated with it).  we do this by ordering the keys in the index row, in partitioner order.

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