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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3668) Performance of sstableloader is affected in 1.0.x
Date Fri, 27 Apr 2012 15:46:51 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3668?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263750#comment-13263750
] 

Yuki Morishita commented on CASSANDRA-3668:
-------------------------------------------

Sylvain, thanks for review. I will post updates based on your feedback.

Before that, here is the result of my performance test.
Used 1 node for vanilla C* (0.8.10, 1.1.0, 1.1.0-patched), and 1 node for sstableloader. Generated
sstables to stream(8 files, 1.6GB total) using stress tool against v0.8.10 cassandra, and
performed sstableloader(streaming throttling is disabled). Same sstable files were used for
all tests. Each test ran twice and took average.

|| test case         || time to complete (sec) || avg. bps (MB/S) ||
| v0.8.10            | 52.38(*1) | 53 |
| v1.1.0             | 52.30     | 15 |
| v1.1.0-patched n=1 | 52.61     | 15 |
| v1.1.0-patched n=2 | 32.42     | 27 |
| v1.1.0-patched n=4 | 30.80     | 27 |
| v1.1.0-patched n=8 | 33.88     | 25 |

n value for v1.1.0-patched is number of threads to use.
v0.8.10 sleeps 30 sec to get gossip info, so (*1) is actually 22.38.

It's not as fast as 0.8 with this feature, but can boost loading compared to current versions.
                
> Performance of sstableloader is affected in 1.0.x
> -------------------------------------------------
>
>                 Key: CASSANDRA-3668
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3668
>             Project: Cassandra
>          Issue Type: Bug
>          Components: API
>    Affects Versions: 1.0.0
>            Reporter: Manish Zope
>            Assignee: Yuki Morishita
>            Priority: Minor
>              Labels: streaming
>             Fix For: 1.1.1
>
>         Attachments: 0001-Allow-multiple-connection-in-StreamInSession.patch, 0002-Allow-concurrent-stream-in-StreamOutSession.patch,
0003-Add-threads-option-to-sstableloader.patch, 3688-reply_before_closing_writer.txt, sstable-loader
performance.txt
>
>   Original Estimate: 48h
>  Remaining Estimate: 48h
>
> One of my colleague had reported the bug regarding the degraded performance of the sstable
generator and sstable loader.
> ISSUE :- https://issues.apache.org/jira/browse/CASSANDRA-3589 
> As stated in above issue generator performance is rectified but performance of the sstableloader
is still an issue.
> 3589 is marked as duplicate of 3618.Both issues shows resolved status.But the problem
with sstableloader still exists.
> So opening other issue so that sstbleloader problem should not go unnoticed.
> FYI : We have tested the generator part with the patch given in 3589.Its Working fine.
> Please let us know if you guys require further inputs from our side.

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