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HBASE-25852 Move all the intialization work of LoadBalancer implement… - #3248
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…ation to initialize method
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saintstack
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May 10, 2021
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LG.
Good cleanup.
Nit questions/Comments
| * Set the current cluster status. This allows a LoadBalancer to map host name to a server | ||
| */ | ||
| void setClusterMetrics(ClusterMetrics st); | ||
| void updateClusterMetrics(ClusterMetrics metrics); |
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We change the method name because the method is now being used differently? Before we called 'set' once? But now we 'update' continuously during operation? Or was it just always incorrectly named?
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We have a background chore called ClusterStatusChore to call this method periodically...
| * <p/> | ||
| * Since 3.0.0, all the balancers will be wrapped inside a {@code RSGroupBasedLoadBalancer}, it will | ||
| * be in charge of the synchronization of balancing and configuration changing, so we do not need to | ||
| * synchronized by ourselves. |
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Interesting. Wondering what the rationale for this (Perhaps it later in this patch)
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It is because a previous work, where we move rsgroup feature to core hbase instead of using coprocessor.
See HBASE-22514.
| .generate(cluster); | ||
| } | ||
| @RestrictedApi(explanation = "Should only be called in tests", link = "", |
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Instead of @VisibleForTests? (I like this annotation)
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Yes, @apurtell proposed to remove the VisibleForTesting annotation and the javadoc for VisibleForTestinng also tells that you should not use this annotation anymore and suggests you to use RestrictedApi.
/**
* Annotates a program element that exists, or is more widely visible than otherwise necessary, only
* for use in test code.
*
* <p><b>Do not use this interface</b> for public or protected declarations: it is a fig leaf for
* bad design, and it does not prevent anyone from using the declaration---and experience has shown
* that they will. If the method breaks the encapsulation of its class, then its internal
* representation will be hard to change. Instead, use <a
* href="http://errorprone.info/bugpattern/RestrictedApiChecker">RestrictedApiChecker</a>, which
* enforces fine-grained visibility policies.
*
* @author Johannes Henkel
*/
@GwtCompatible
public @interface VisibleForTesting {
}
We will enable error prone when building the project in the general check state in pre commit, so if you break the restriction, there will be a compile error, which is much more useful than VisibleForTesting.
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…ation to initialize method (apache#3248) Signed-off-by: Michael Stack <stack@apache.org> Signed-off-by: Yulin Niu <niuyulin@apache.org>
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…ation to initialize method