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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-1072) Increment counters
Date Mon, 29 Nov 2010 15:51:22 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-1072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12964786#action_12964786
] 

Jonathan Ellis commented on CASSANDRA-1072:
-------------------------------------------

Is this an accurate summary of the current state of 1072 and CASSANDRA-1546?

1072-pro: tested in production.  Supports counters in subcolumns.

1072-con: IP-based partitioning is prone to catastrophic data loss if node IPs change (which
is fairly common on an EC2/EBS deployment) or on decommission-after-bootstrap-before-repair
(which is fairly uncommon ime) or possibly in other scenarios as well; changing 1072 to use
UUIDs instead of IPs to fix this would be a substantial undertaking.  In the worst case, there
is no ConsistencyLevel guarantee higher than ONE even with repair-on-write.

1546-pro: ConsistencyLevel support is built in; support for optional "marker" allows retry
on failure as well.  "LocalCounterColumn" approach is less scary if there are bugs than relying
on post-transfer "cleaning" of non-local data. Supports node IP changes.

1546-con: essentially untested.  Some known corner cases involving node movement need to be
addressed.  Would require using a custom comparator to emulate counters in subcolumns.

> Increment counters
> ------------------
>
>                 Key: CASSANDRA-1072
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-1072
>             Project: Cassandra
>          Issue Type: Sub-task
>          Components: Core
>            Reporter: Johan Oskarsson
>            Assignee: Kelvin Kakugawa
>         Attachments: CASSANDRA-1072.112210.patch, CASSANDRA-1072.patch, increment_test.py,
Partitionedcountersdesigndoc.pdf
>
>
> Break out the increment counters out of CASSANDRA-580. Classes are shared between the
two features but without the plain version vector code the changeset becomes smaller and more
manageable.

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