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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Updated: (CASSANDRA-433) Remove item flush limit in BinaryMemtable
Date Wed, 23 Sep 2009 18:33:16 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-433?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-433:
-------------------------------------

    Attachment: 433.patch

from irc:

jbellis: if you really use different sizes for BMt and normal Mt then i think we should have
different settings. i'm just not sure why you'd want to do that
goffinet: we wouldnt want it to run that high [a heap] at all times; we'd rather use the ram
for FS cache
jbellis: so if you do want different sizes for Mt/BMt let's just leave the separate BMt setting
in and not make ops have to mess with things when bulk load is done
goffinet: ok

here is patch.


> Remove item flush limit in BinaryMemtable
> -----------------------------------------
>
>                 Key: CASSANDRA-433
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-433
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.5
>            Reporter: Johan Oskarsson
>            Assignee: Chris Goffinet
>             Fix For: 0.5
>
>         Attachments: 0001-CASSANDRA-433.-Consolidated-BMT-threshold-and-object.patch,
433.patch, CASSANDRA-433.patch
>
>
> The BinaryMemtable flushes in memory data to disk when the size of the data reaches a
certain limit. There is also a hard coded limit that initiates the flush when more then 50000
items have been inserted. That causes issues if a lot of small items are inserted, we should
remove or make the limit configurable.

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