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From "Mck SembWever (JIRA)" <j...@apache.org>
Subject [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.
Date Wed, 29 Jun 2011 21:18:29 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-2388?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13057470#comment-13057470
] 

Mck SembWever edited comment on CASSANDRA-2388 at 6/29/11 9:18 PM:
-------------------------------------------------------------------

bq. tlipcon says it comes back after 24h
just to be clear about my concerns. 
this means a dead c* node will bring down a TT. In a hadoop cluster with 3 nodes this means
for 24hrs you're lost 33% throughput. (If less than 10% of hadoop jobs used CFIF i could well
imagine some pissed users). (What if you have a temporarily problem with flapping c* nodes
and you end up with a handful of blacklisted TTs? etc etc etc).

All this when using a replica, any replica, could have kept things going smoothly, the only
slowdown being some of the data into CFIF had to go over the network instead...


      was (Author: michaelsembwever):
    bq. tlipcon says it comes back after 24h
just to be clear about my concerns. 
this means a dead c* node will bring down a TT. In a hadoop cluster with 3 nodes this means
for 24hrs you're lost 33% throughput. (If less than 10% of hadoop jobs used CFIF i could well
imagine some pissed customers). (What if you have a temporarily problem with flapping c* nodes
and you end up with a handful of blacklisted TTs? etc etc etc).

All this when using a replica, any replica, could have kept things going smoothly, the only
slowdown being some of the data into CFIF had to go over the network instead...

  
> 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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