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Posted to issues@hbase.apache.org by "Xiaolin Ha (Jira)" <ji...@apache.org> on 2021/04/12 07:00:00 UTC
[jira] [Updated] (HBASE-25768) Support a overall simple and fast
balance strategy for StochasticLoadBalancer
[ https://issues.apache.org/jira/browse/HBASE-25768?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Xiaolin Ha updated HBASE-25768:
-------------------------------
Description:
When we use StochasticLoadBalancer + balanceByTable, we could face two difficulties.
# For each table, their regions are distributed uniformly, but for the overall cluster, still exiting imbalance between RSes;
# When there are large-scaled restart of RSes, or expansion for groups or cluster, we hope the balancer can execute as soon as possible, but the StochasticLoadBalancer may need a lot of time to compute costs.
We can detect these circumstances in StochasticLoadBalancer(such as using the percentage of skew tables), and before the normal balance steps trying, we can add a strategy to let it just balance like the SimpleLoadBalancer or use few light cost functions here.
was:
When we use StochasticLoadBalancer + balanceByTable, we could face two difficulties.
# For each table, their regions are distributed uniformly, but for the overall cluster, still exiting imbalance between RSes;
# When there are large-scaled restart of RSes, or expansion for groups or cluster, we hope the balancer can execute as soon as possible, but the StochasticLoadBalancer may need a lot of time to compute costs.
We can detect these circumstances in StochasticLoadBalancer, and before the normal balance steps trying, we can add a strategy to let it just balance like the SimpleLoadBalancer or use few light cost functions here.
> Support a overall simple and fast balance strategy for StochasticLoadBalancer
> -----------------------------------------------------------------------------
>
> Key: HBASE-25768
> URL: https://issues.apache.org/jira/browse/HBASE-25768
> Project: HBase
> Issue Type: Improvement
> Components: Balancer
> Affects Versions: 3.0.0-alpha-1, 2.0.0, 1.4.13
> Reporter: Xiaolin Ha
> Assignee: Xiaolin Ha
> Priority: Major
>
> When we use StochasticLoadBalancer + balanceByTable, we could face two difficulties.
> # For each table, their regions are distributed uniformly, but for the overall cluster, still exiting imbalance between RSes;
> # When there are large-scaled restart of RSes, or expansion for groups or cluster, we hope the balancer can execute as soon as possible, but the StochasticLoadBalancer may need a lot of time to compute costs.
> We can detect these circumstances in StochasticLoadBalancer(such as using the percentage of skew tables), and before the normal balance steps trying, we can add a strategy to let it just balance like the SimpleLoadBalancer or use few light cost functions here.
>
>
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