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From "Paulo Motta (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 Mon, 09 Jun 2014 14:20:02 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14025213#comment-14025213
] 

Paulo Motta commented on CASSANDRA-2388:
----------------------------------------

Attached [2.0-CASSANDRA-2388.patch|https://issues.apache.org/jira/secure/attachment/12649379/2.0-CASSANDRA-2388.patch]
(against 2.0), where CASSANDRA-6302 is ported to ColumnFamilyRecordReader, so the next replicas
are tried when the first one fails.

Reading from a non-local-DC replica is not a problem anymore due to the introduction of describe_local_ring
(CASSANDRA-6268), that limits the input splits to the local DC.

I would like to acknowledge my colleague Danilo Penna Queiroz who paired with me on this patch.


> 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: 0.6
>            Reporter: Eldon Stegall
>            Assignee: Mck SembWever
>            Priority: Minor
>              Labels: hadoop, inputformat
>             Fix For: 2.0.9
>
>         Attachments: 0002_On_TException_try_next_split.patch, 2.0-CASSANDRA-2388.patch,
CASSANDRA-2388-addition1.patch, CASSANDRA-2388-extended.patch, CASSANDRA-2388.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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