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Posted to commits@cassandra.apache.org by "Mck SembWever (JIRA)" <ji...@apache.org> on 2011/07/03 00:08:22 UTC
[jira] [Issue Comment Edited] (CASSANDRA-2388)
ColumnFamilyRecordReader fails for a given split because a host is down,
even if records could reasonably be read from other replica.
[ https://issues.apache.org/jira/browse/CASSANDRA-2388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13059134#comment-13059134 ]
Mck SembWever edited comment on CASSANDRA-2388 at 7/2/11 10:08 PM:
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The idea is to setup splits to have only endpoints that are valid trackers. But now i see this is just a brainfart :-) Ofc the jobTracker will apply this match for us. And that CFIF was always 'restricted' to running on endpoints. Although the documentation on inputSplit.getLocations() is a little thin as to whether this restricts which trackers it should run on or whether is just a preference... I guess it doesn't matter, as you point out Jonathan all that's required here is the one line changed in CFRR.
was (Author: michaelsembwever):
The idea is to setup splits to have only endpoints that are valid trackers. But now i see this is just a brainfart :-) Ofc the jobTracker will apply this match for us. And that CFIF was always 'restricted' to running on endpoints. Although the documentation on inputSplit.getLocations() is a little thin as to whether this restricts which trackers it should run on or whether is just a recommendation... I guess it doesn't matter, as you point out Jonathan all that's required here is the one line changed in CFRR.
> 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-local-nodes-only.rough-sketch, 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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