You are viewing a plain text version of this content. The canonical link for it is here.
Posted to notifications@accumulo.apache.org by "Eric Newton (JIRA)" <ji...@apache.org> on 2016/01/14 23:24:39 UTC
[jira] [Updated] (ACCUMULO-4112) MinC start/stop updates are always
hsync'd
[ https://issues.apache.org/jira/browse/ACCUMULO-4112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Eric Newton updated ACCUMULO-4112:
----------------------------------
Attachment: MinCFlushPerfTest.java
> MinC start/stop updates are always hsync'd
> ------------------------------------------
>
> Key: ACCUMULO-4112
> URL: https://issues.apache.org/jira/browse/ACCUMULO-4112
> Project: Accumulo
> Issue Type: Bug
> Components: tserver
> Environment: Fluo testing on a 20-node cluster
> Reporter: Eric Newton
> Assignee: Eric Newton
> Priority: Minor
> Attachments: MinCFlushPerfTest.java
>
>
> [~kturner] writes:
> {quote}
> I was running a Fluo test with 1.8.0-SNAP on my workstation. My Fluo table had a ton of tablets. I was seeing terrible performance. I started looking at the tserver and noticed it was always calling hsync. I tracked down the problem to the fact that when minc start and stop events are written to the log they are always written w/ sync level. My poor little tserver was constantly minor compacting (probably had around 600 tablets that were all being written to).
> I changed the test config to create like 15 tablets and the performance was much better. All cores were 100% utilized, which was not the case when hsync was always called.
> {quote}
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)