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From "Jonathan Ellis (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-2649) work-around schema disagreements from cqlsh
Date Mon, 23 May 2011 15:44:53 GMT


Jonathan Ellis commented on CASSANDRA-2649:

The right thing to do is wait for agreement after each schema change. Relying on integrityerror
is broken since inserts will just fail.  using describe_schema_versions let's this be 100%
correct instead of hoping you slept long enough before proceeding.

bq. this currently employs no use of the thrift RPC API

since cql is built on thrift, it wouldn't be difficult to use the thrift method until there
is a "native" replacement.

> work-around schema disagreements from cqlsh
> -------------------------------------------
>                 Key: CASSANDRA-2649
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Tools
>    Affects Versions: 0.8.0 beta 2
>            Reporter: Eric Evans
>            Assignee: Eric Evans
>            Priority: Minor
>              Labels: cql
>             Fix For: 0.8.0
>         Attachments: v1-0001-CASSANDRA-2649-try-to-work-around-schema-disagreement-.txt
> It is handy to be able to put CQL statements in a flat-file and load them by redirecting
to {{cqlsh}} stdin, but this can fail on a cluster when executing statements that modify schema.
> The attached patch works around this problem by retrying up to 3 times, with a progressive
delay after each attempt.  A better solution would probably be to compare schema versions,
but this seems to work well enough, and is better than _not_ handling it at all.

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