[
https://issues.apache.org/jira/browse/HBASE-17462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15830988#comment-15830988
]
Tim Brown commented on HBASE-17462:
-----------------------------------
Yes, different colors represent different regions. I tested this out on our
staging environment which has variable amounts of activity. It's not due to the
changes.
> Investigate using sliding window for read/write request costs in
> StochasticLoadBalancer
> ---------------------------------------------------------------------------------------
>
> Key: HBASE-17462
> URL: https://issues.apache.org/jira/browse/HBASE-17462
> Project: HBase
> Issue Type: Improvement
> Reporter: Ted Yu
> Assignee: Tim Brown
> Labels: patch
> Attachments: after_changes.png, before_changes.png, HBASE-17462.patch
>
>
> In the thread, http://search-hadoop.com/m/HBase/YGbbyUZKXWALkX1, Timothy was
> asking whether the read/write request costs in StochasticLoadBalancer should
> be calculated as rates.
> This makes sense since read / write load on region server tends to fluctuate
> over time. Using sliding window would reflect more recent trend in read /
> write load.
> Some factors to consider:
> The data structure used by StochasticLoadBalancer should be concise. The
> number of regions in a cluster can be expected to approach 1 million. We
> cannot afford to store long history of read / write requests in master.
> Efficiency of cost calculation should be high - there're many cost
> functions the balancer goes through, it is expected for each cost function
> to return quickly. Otherwise we would not come up with proper region
> movement plan(s) in time.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
