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From "Philip Thompson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8989) Reading from table which contains collection type using token function and with CL > ONE causes overwhelming writes to replicas
Date Thu, 19 Mar 2015 16:06:39 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8989?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14369610#comment-14369610
] 

Philip Thompson commented on CASSANDRA-8989:
--------------------------------------------

I can reproduce this consistently with a two node ccm cluster all the way back to 2.0.0. It
is not happening on 2.1+, as stated by the reporter. 

> Reading from table which contains collection type using token function and with CL >
ONE causes overwhelming writes to replicas
> -------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-8989
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8989
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Miroslaw Partyka
>         Attachments: trace.txt
>
>
> When reading from a table at the aforementioned conditions, each read from replica also
casues write to the replica. 
> Confimed in version 2.0.12 & 2.0.13, version 2.1.3 seems ok.
> To reproduce:
> {code}CREATE KEYSPACE test WITH replication = {'class': 'NetworkTopologyStrategy', 'DC1':
2};
> USE test;
> CREATE TABLE bug(id int PRIMARY KEY, val map<int,int>);
> INSERT INTO bug(id, val) VALUES (1, {2: 3});
> CONSISTENCY LOCAL_QUORUM
> TRACING ON
> SELECT * FROM bug WHERE token(id) <= 0;{code}
> trace contains twice:
> Appending to commitlog
> Adding to bug memtable



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