[jira] [Assigned] (THRIFT-788) thrift_protocol.so: multiget/multiget_slice does not handle more than 17 keys correctly

["Nicholas Telford (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/THRIFT-788?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Nicholas Telford reassigned THRIFT-788:
---------------------------------------

    Assignee: Nicholas Telford

> thrift_protocol.so: multiget/multiget_slice does not handle more than 17 keys correctly
> ---------------------------------------------------------------------------------------
>
>                 Key: THRIFT-788
>                 URL: https://issues.apache.org/jira/browse/THRIFT-788
>             Project: Thrift
>          Issue Type: Bug
>          Components: PHP - Library
>         Environment: - ubuntu 10.04 32bit
> - thrift svn
> - php-5.3.2 with thrift_protocol.so 1.0 enabled
> - cassandra 0.6+0.7/trunk
>            Reporter: Alexander Liemen
>            Assignee: Nicholas Telford
>              Labels: multiget, multiget_slice, php, thrift_protocol
>             Fix For: 0.7
>
>         Attachments: multiget_slice.php
>
>
> thrift_protocol.so does not handle multiget/multiget_slice with more than 17 keys correctly. The query time sky rockets from 10ms to a steady 900ms starting with 18 keys. It doesn't matter if you fetch 18 or 50. Solid 900ms...
> The bug can easily + steadily be reproduced:
> - standard Keyspace1 / CF Standard1 setup
>     - name: Keyspace1
>       replica_placement_strategy: org.apache.cassandra.locator.RackUnawareStrategy
>       replication_factor: 1
>       column_families:
>         - name: Standard1
>           compare_with: BytesType
> - insert e.g. 1000 columns email:value / testmail1-testmail1000 with key = 1...1000
> - $keys=array('1','2',.....'17')
> - $client->multiget_slice($keys,$columnParent,$predicate,$consistency_level);  -> 10ms
> - $keys=array('1','2',.....'18')
> - $client->multiget_slice($keys,$columnParent,$predicate,$consistency_level);  -> 900ms
>  
> - $keys=array('1','2',.....'100')
> - $client->multiget_slice($keys,$columnParent,$predicate,$consistency_level);  -> 900ms
> It does return the right columns though.
> It can easily be fixed: disable thrift_protocol.so ;)
> This might be a 32bit microseconds issue. Still very strange though.

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