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Posted to commits@cassandra.apache.org by "Brandon Williams (Issue Comment Edited) (JIRA)" <ji...@apache.org> on 2011/11/28 19:59:40 UTC
[jira] [Issue Comment Edited] (CASSANDRA-3045) Update
ColumnFamilyOutputFormat to use new bulkload API
[ https://issues.apache.org/jira/browse/CASSANDRA-3045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13158635#comment-13158635 ]
Brandon Williams edited comment on CASSANDRA-3045 at 11/28/11 6:58 PM:
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bq. are there any benchmarks or is there anything anecdotal about performance?
Using the simplest job possible (copying a CF, map-only) I see a 20-25% gain. I suspect this is read-limited though and if you're generating the output on a hadoop cluster and loading it into a cassandra cluster (ie, not colocated), this will be even faster, but creating such a workload is a bit too much work for me to test. If anyone has an existing case like this, I'd love for them to test and chime in.
One other thing though, there are far less failures using BOF on a workload that generates a lot of GC (inserting a couple of hundred columns creates quite a bit and causes failures due to UE while the nodes are CMSing.) So BOF is much 'nicer' to the cluser.
was (Author: brandon.williams):
bq. are there any benchmarks or is there anything anecdotal about performance?
Using the simplest job possible (copying a CF, map-only) I see a 20-25% gain. I suspect this is read-limited though and if you're generating the output on a hadoop cluster and loading it into a cassandra cluster (ie, not colocated), this will be even faster, but creating such a workload is a bit too much work for me to test. If anyone has an existing case like this, I'd love for them to test and chime in.
> Update ColumnFamilyOutputFormat to use new bulkload API
> -------------------------------------------------------
>
> Key: CASSANDRA-3045
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3045
> Project: Cassandra
> Issue Type: Improvement
> Components: Hadoop
> Reporter: Jonathan Ellis
> Assignee: Brandon Williams
> Priority: Minor
> Fix For: 1.1
>
> Attachments: 0001-Remove-gossip-SS-requirement-from-BulkLoader.txt, 0002-Allow-DD-loading-without-yaml.txt, 0003-hadoop-output-support-for-bulk-loading.txt
>
>
> The bulk loading interface added in CASSANDRA-1278 is a great fit for Hadoop jobs.
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