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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-5443) Add CAS CQL support
Date Tue, 14 May 2013 20:31:15 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-5443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13657471#comment-13657471
] 

Jonathan Ellis commented on CASSANDRA-5443:
-------------------------------------------

The tracing I see suggests that this is actually executing StorageProxy.mutate instead of
SP.cas:

{noformat}
cqlsh:foo> update bar set j=1 where i=1 if not exists;

 activity                          | timestamp    | source    | source_elapsed
-----------------------------------+--------------+-----------+----------------
                execute_cql3_query | 15:24:50,122 | 127.0.0.1 |              0
                 Parsing statement | 15:24:50,122 | 127.0.0.1 |             68
                Peparing statement | 15:24:50,123 | 127.0.0.1 |            482
 Determining replicas for mutation | 15:24:50,123 | 127.0.0.1 |            762
    Acquiring switchLock read lock | 15:24:50,124 | 127.0.0.1 |           1790
            Appending to commitlog | 15:24:50,124 | 127.0.0.1 |           1815
            Adding to bar memtable | 15:24:50,124 | 127.0.0.1 |           1871
                  Request complete | 15:24:50,124 | 127.0.0.1 |           2246
{noformat}

it's not just the IF EXISTS syntax:

{noformat}
cqlsh:foo> update bar set j=2 where i=1 if j=1;

 activity                          | timestamp    | source    | source_elapsed
-----------------------------------+--------------+-----------+----------------
                execute_cql3_query | 15:25:32,657 | 127.0.0.1 |              0
                 Parsing statement | 15:25:32,657 | 127.0.0.1 |             47
                Peparing statement | 15:25:32,657 | 127.0.0.1 |            306
 Determining replicas for mutation | 15:25:32,657 | 127.0.0.1 |            457
    Acquiring switchLock read lock | 15:25:32,658 | 127.0.0.1 |           1082
            Appending to commitlog | 15:25:32,658 | 127.0.0.1 |           1106
            Adding to bar memtable | 15:25:32,658 | 127.0.0.1 |           1163
                  Request complete | 15:25:32,658 | 127.0.0.1 |           1440
{noformat}
                
> Add CAS CQL support
> -------------------
>
>                 Key: CASSANDRA-5443
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-5443
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: API, Core
>            Reporter: Jonathan Ellis
>            Assignee: Sylvain Lebresne
>             Fix For: 2.0
>
>         Attachments: 0001-Refactor-Update-and-Delete-statement-to-extract-common.txt,
0002-Add-syntax-to-support-conditional-update-delete.txt, 0003-Handle-deleted-and-expiring-column-in-paxos-updates.txt,
0004-Support-tombstones-when-comparing-for-CAS.txt, 0005-add-UPDATE-.-IF-NOT-EXISTS-syntax.txt,
0006-Make-EXISTS-a-reserverd-keyword.txt
>
>


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