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From "Tyler Hobbs (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-7123) BATCH documentation should be explicit about ordering guarantees
Date Thu, 01 May 2014 16:44:15 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-7123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Tyler Hobbs updated CASSANDRA-7123:
-----------------------------------

    Attachment: 7123-v2.txt

v2 of the patch is the same, except for the bullet point in debate:

bq. If a timestamp is not specified for each operation, then all operations will be applied
with the same timestamp. Due to Cassandra's conflict resolution procedure in the case of timestamp
ties, operations may be applied in an order that is different from the order they are listed
in the @BATCH@ statement. To force a particular operation ordering, you must specify per-operation
timestamps.

This hints at timestamp ties and conflict resolution being the cause for unexpected operation
ordering, but doesn't mention deletes winning over writes, or the highest value winning for
normal writes.  (It should be extremely rare for somebody to rely on this exact conflict resolution
behavior for normal operations.)

> BATCH documentation should be explicit about ordering guarantees
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-7123
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-7123
>             Project: Cassandra
>          Issue Type: Task
>          Components: Documentation & website
>            Reporter: Tyler Hobbs
>            Assignee: Tyler Hobbs
>            Priority: Minor
>         Attachments: 7123-v2.txt, 7123.txt
>
>
> In the CQL3 [batch statement documentation](http://cassandra.apache.org/doc/cql3/CQL.html#batchStmt)
we don't mention that there are no ordering guarantees, which can lead to somewhat surprising
behavior (CASSANDRA-6291).
> We should also mention that you could specify timestamps in order to achieve a particular
ordering.



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