An OutlierDetectionLoadBalancer child load balancer might decided to
shut down any subchannel it is tracking. We need to make sure that those
subchannels are removed from the outlier detection tracker map to avoid
a memory leak.
* Update picker logic per A61 that it no longer pays attention to the first 2 elements, but rather takes the first ring element not in TF and uses that.
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Pulled in by rebase:
Eric Anderson (android: Remove unneeded proguard rule 44723b6)
Terry Wilson (stub: Deprecate StreamObservers b5434e8)
Instead of a boolean, we now return a Status object. Status.OK
represents accepted addresses and other non-acceptance. This allows the
LB to provide more information about why a set of addresses were not
acceptable.
The status will later be sent to the name resolver as well to allow it
to also better react to to bad addresses.
FixedResultPicker can be used in more situations. Note that
WrrLocalityLoadBalancerTest's test was changed non-trivially. The
noChildLb test was particularly nasty as it assumed
LoadBalancer.ErrorPicker had same toString() as
GracefulSwitchLoadBalancer's ErrorPicker.
* Mark MultiChildLoadBalancer as Internal. Cannot move to the internal package because of its use of classes in the util package.
* Exclude MultiChildLoadBalancer from javadoc generation.
* Fix javadoc creation.
OutlierDetectionLoadBalancer did not delegate calls to an existing
ClientStreamTracer from the tracer it installed. This change has the OD
tracer delegate all calls to the underlying one.
Eric Anderson
Terry Wilson
Larry Safran
sanjaypujare