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From "Mck SembWever (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-2388) ColumnFamilyRecordReader fails for a given split because a host is down, even if records could reasonably be read from other replica.
Date Sat, 11 Jun 2011 09:16:00 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2388?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mck SembWever updated CASSANDRA-2388:
-------------------------------------

    Attachment: CASSANDRA-2388.patch

New patch. I think i'm at last happy with it.

getLocations() returns an iterator so client.describe_datacenter() is only called when necessary.

Rather than provide a list in initialAddress it was possible to use either the initialAddress
OR the endpoint. This gave the benefit in not listing a location that can't actually be connected
to.

The "only use replica from same DC" is an option now in ConfigHelper. By default it is true.

Again the re-generated Cassandra.java is not included in the patch.

I have tested this on normal jobs, and RF=2 jobs with a node down.

> 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
>            Reporter: Eldon Stegall
>            Assignee: Mck SembWever
>              Labels: hadoop, inputformat
>             Fix For: 0.8.1
>
>         Attachments: 0002_On_TException_try_next_split.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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