[
https://issues.apache.org/jira/browse/CASSANDRA-4338?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yuki Morishita updated CASSANDRA-4338:
--------------------------------------
Attachment: gc-trunk.png
gc-4338-patched.png
So I implemented SequentialWriter with DirectBB, and ran test on it. Code is
pushed to here: https://github.com/yukim/cassandra/tree/4338-3
Test: 'cassandra-stress -Z LeveledCompactionStrategy -n 20000000' to empty
trunk and patched node.
Attached two screenshots show gc stats. Unfortunately I cannot see significant
difference between two. Any suggestions on implementation/testing?
> Experiment with direct buffer in SequentialWriter
> -------------------------------------------------
>
> Key: CASSANDRA-4338
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4338
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Yuki Morishita
> Priority: Minor
> Fix For: 1.2
>
> Attachments: gc-4338-patched.png, gc-trunk.png
>
>
> Using a direct buffer instead of a heap-based byte[] should let us avoid a
> copy into native memory when we flush the buffer.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
