[
https://issues.apache.org/jira/browse/HADOOP-12975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15225299#comment-15225299
]
Colin Patrick McCabe commented on HADOOP-12975:
-----------------------------------------------
Good idea.
Can we make the jitter percentage configurable? What motivates choosing 50% of
the full refresh period as the jitter default? For people with really long DU
periods, this could extend that refresh time by quite a bit. Perhaps jitter
should be specified as a maximum number of seconds uniformly randomly added,
rather than a percentage of the full refresh period?
I think this can get in separately from HADOOP-12973.
> Add jitter to DU's thread
> -------------------------
>
> Key: HADOOP-12975
> URL: https://issues.apache.org/jira/browse/HADOOP-12975
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Elliott Clark
> Assignee: Elliott Clark
> Attachments: HADOOP-12975v0.patch, HADOOP-12975v1.patch
>
>
> Running DU across lots of disks is very expensive and running all of the
> processes at the same time creates a noticeable IO spike. We should add some
> jitter.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
