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From "Michael Greene (JIRA)" <j...@apache.org>
Subject [jira] Issue Comment Edited: (CASSANDRA-300) Enumerate useful consistency options for read/write calls
Date Tue, 21 Jul 2009 13:41:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12733617#action_12733617
] 

Michael Greene edited comment on CASSANDRA-300 at 7/21/09 6:41 AM:
-------------------------------------------------------------------

You can specify defaults to struct values, but I'm not sure about default method parameters
-- few languages support this functionality, so I doubt it.  It may be premature generalization,
but the second option would allow you to have a default:

struct ConsistencyRequest {
  1: required ConsistencyLevel level = ONE,
  2: optional int nodes,
}

read(1: string thing, 2: ConsistencyRequest request)

      was (Author: euphoria):
    You can specify defaults to struct values, but I'm not sure about default method parameters
-- few languages support this functionality, so I doubt it.  It may be premature generalization,
but the second option would allow you to have a default:

struct ConsistencyRequest {
  1: required ConsistencyLevel level = ONE,
  2: optional int nodes,
}

read(1: string thing, 2: ConsistencyRequest)
  
> Enumerate useful consistency options for read/write calls
> ---------------------------------------------------------
>
>                 Key: CASSANDRA-300
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-300
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Michael Greene
>
> Currently, a user has to specify an int for the number of nodes to block_for.  As discussed
on IRC, there are only a few options that a user would want, so this would be better encapsulated
by an enum.
> enum  ConsistencyLevel {
>     ZERO = 0,
>     ONE = 1,
>     QUORUM = 2,
>     ALL = 3,
> }
> This could be extended with a fifth option, CUSTOM = 4, if custom specifications are
desired
> struct ConsistencyRequest {
>     1: required ConsistencyLevel level,
>     2: optional int nodes
> }

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