Ted Yu created HBASE-17462:
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Summary: 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
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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