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From "Mck SembWever (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-2388) ColumnFamilyRecordReader fails for a given split because a host is down, even if records could reasonably be read from other replica.
Date Thu, 30 Jun 2011 07:52:28 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057659#comment-13057659
] 

Mck SembWever commented on CASSANDRA-2388:
------------------------------------------

Then i would hope for two separate InputFormats. One optimised for local node connection,
where cassandra is deemed the more important system over hadoop, and another where data can
be read in from anywhere. I think the latter should be supported in some manner  since users
may not always have the possibility to install hadoop and cassandra on the same servers, or
they might not think it to be so critical part (eg if CFIF is reading using a IndexClause
the input data set might be quite small and the remaining code in the m/r be the bulk of the
processing...)

> ColumnFamilyRecordReader fails for a given split because a host is down, even if records
could reasonably be read from other replica.
> -------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2388
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2388
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 0.7.6, 0.8.0
>            Reporter: Eldon Stegall
>            Assignee: Jeremy Hanna
>              Labels: hadoop, inputformat
>             Fix For: 0.7.7, 0.8.2
>
>         Attachments: 0002_On_TException_try_next_split.patch, CASSANDRA-2388-addition1.patch,
CASSANDRA-2388.patch, CASSANDRA-2388.patch, CASSANDRA-2388.patch
>
>
> ColumnFamilyRecordReader only tries the first location for a given split. We should try
multiple locations for a given split.

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