Briana Augenreich created HBASE-26798:
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Summary: balancer reported metrics and balancer logs
Key: HBASE-26798
URL: https://issues.apache.org/jira/browse/HBASE-26798
Project: HBase
Issue Type: Improvement
Affects Versions: 2.5.0, 2.6.0, 3.0.0-alpha-3, 2.4.11
Reporter: Briana Augenreich
Assignee: Briana Augenreich
Sometimes we have noticeable skew in our hbase clusters but see the balancer
cannot find a better plan to resolve this skew. When trying to reason about why
the StochasticLoadBalancer is not taking action and appropriately tuning costs
as needed, it is often hard to quickly reason about how the published metrics
and output in the logs correlate and impact the balancer actions. It is also
sometimes hard to reason about how a cost like the move cost (which doesnt show
up in imbalance and is a hidden cost against every move in calculating a new
plan) might be impacting the balancer effectiveness.
It would be nice to include some additional information like the sumMultiplier
and overallCost in the logs as well as publish the weighted imbalance metrics
and rename the cost metrics to CostFunctionPercentage. Also additional logging
for the state of the cost functions when an improved plan cannot be found would
also be helpful.
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