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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-17462) Investigate using sliding window for read/write request costs in StochasticLoadBalancer
Date Thu, 19 Jan 2017 16:38:26 GMT

    [ https://issues.apache.org/jira/browse/HBASE-17462?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15830221#comment-15830221
] 

Ted Yu commented on HBASE-17462:
--------------------------------

Currently the cost for read / write requests is very low:
{code}
    private static final float DEFAULT_READ_REQUEST_COST = 5;
{code}
In order to make your changes more visible, consider increasing the costs (to ballpark of
500).

> 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
>
> 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.



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