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Date: Mon, 28 Aug 2017 18:00:00 +0000 (UTC)
From: "ZhaoYang (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.13011714.1476290749000.138869.1503943200654@Atlassian.JIRA>
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Subject: [jira] [Commented] (CASSANDRA-12783) Break up large MV mutations to
 prevent OOMs
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archived-at: Mon, 28 Aug 2017 18:00:06 -0000


    [ https://issues.apache.org/jira/browse/CASSANDRA-12783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16144131#comment-16144131 ] 

ZhaoYang commented on CASSANDRA-12783:
--------------------------------------

The default TimeUUID(version 1).compareTo() doesn't compare Timestamp first then machine part, it compares MSB.

You could try {{TimeUUIDType.compare}}

{code}
UUID V1, Most Significant Bit:
0xFFFFFFFF00000000 time_low
0x00000000FFFF0000 time_mid
0x000000000000F000 version
0x0000000000000FFF time_hi
{code}

> Break up large MV mutations to prevent OOMs
> -------------------------------------------
>
>                 Key: CASSANDRA-12783
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12783
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths, Materialized Views
>            Reporter: Carl Yeksigian
>            Assignee: Kurt Greaves
>             Fix For: 4.x
>
>
> We only use the code path added in CASSANDRA-12268 for the view builder because otherwise we would break the contract of the batchlog, where some mutations may be written and pushed out before the whole batch log has been saved.
> We would need to ensure that all of the updates make it to the batchlog before allowing the batchlog manager to try to replay them, but also before we start pushing out updates to the paired replicas.


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