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From "Andy Tolbert (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-10539) Different encodings used between nodes can cause inconsistently generated prepared statement ids
Date Fri, 16 Oct 2015 18:23:05 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-10539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14961136#comment-14961136
] 

Andy Tolbert commented on CASSANDRA-10539:
------------------------------------------

Yep, it appears to be the case (reproduced against 3.0.0-rc1, 2.0.17 and 2.1.9, hadn't tried
2.2.2 but assuming its the same).  I don't consider this too big of a problem since it requires
different instances to be using different encoding which may cause other problems.

> Different encodings used between nodes can cause inconsistently generated prepared statement
ids 
> -------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-10539
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-10539
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Andy Tolbert
>            Priority: Minor
>
> [From the java-driver mailing list|https://groups.google.com/a/lists.datastax.com/forum/#!topic/java-driver-user/3Aa7s0u2ZrI]
/ [JAVA-955|https://datastax-oss.atlassian.net/browse/JAVA-955]
> If you have nodes in your cluster that are using a different default character set it's
possible for nodes to generate different prepared statement ids for the same 'keyspace + query
string' combination.  I imagine this is not a very typical or desired configuration (thus
the low severity).
> This is because [MD5Digest.compute(String)|https://github.com/apache/cassandra/blob/cassandra-3.0/src/java/org/apache/cassandra/utils/MD5Digest.java#L51-L54]
uses [String.getBytes()|http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#getBytes()]
which relies on the default charset.
> In the general case this is fine, but if you use some characters in your query string
such as [Character.MAX_VALUE|http://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#MAX_VALUE]
('\uffff') the byte representation may vary based on the coding.
> I was able to reproduce this configuring a 2-node cluster with node1 using file.encoding
{{UTF-8}} and node2 using file.encoding {{ISO-8859-1}}.   The java-driver test that demonstrates
this can be found [here|https://github.com/datastax/java-driver/blob/java955/driver-core/src/test/java/com/datastax/driver/core/RetryOnUnpreparedTest.java].



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