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xds: Unconditionally apply backoff on ADS stream recreation 

This would limit ADS stream creation to one per second, even if the
old stream was considered good as it received a response. This shouldn't
really ever trigger, and if it does 1 QPS is probably still too high.
But 1 QPS is _substantially_ better than a closed loop and there's very
few additional signals we could use to avoid resetting the backoff.

b/224833499
This commit is contained in:
Eric Anderson 2022-03-29 15:56:51 -07:00
parent 72ae95792c
commit 957079194a
2 changed files with 11 additions and 12 deletions
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11
xds/src/main/java/io/grpc/xds/AbstractXdsClient.java
View File

@ -470,14 +470,9 @@ final class AbstractXdsClient {
// has never been initialized.
retryBackoffPolicy = backoffPolicyProvider.get();
}
long delayNanos = 0;
if (!responseReceived) {
delayNanos =
Math.max(
0,
retryBackoffPolicy.nextBackoffNanos()
- stopwatch.elapsed(TimeUnit.NANOSECONDS));
}
long delayNanos = Math.max(
0,
retryBackoffPolicy.nextBackoffNanos() - stopwatch.elapsed(TimeUnit.NANOSECONDS));
logger.log(XdsLogLevel.INFO, "Retry ADS stream in {0} ns", delayNanos);
rpcRetryTimer = syncContext.schedule(
new RpcRetryTask(), delayNanos, TimeUnit.NANOSECONDS, timeService);

12
xds/src/test/java/io/grpc/xds/ClientXdsClientTestBase.java
View File

@ -2526,9 +2526,13 @@ public abstract class ClientXdsClientTestBase {
verify(edsResourceWatcher, times(3)).onError(errorCaptor.capture());
assertThat(errorCaptor.getValue().getCode()).isEqualTo(Code.DEADLINE_EXCEEDED);
// Reset backoff sequence and retry immediately.
// Reset backoff sequence and retry after backoff.
inOrder.verify(backoffPolicyProvider).get();
fakeClock.runDueTasks();
inOrder.verify(backoffPolicy2).nextBackoffNanos();
retryTask =
Iterables.getOnlyElement(fakeClock.getPendingTasks(RPC_RETRY_TASK_FILTER));
assertThat(retryTask.getDelay(TimeUnit.NANOSECONDS)).isEqualTo(20L);
fakeClock.forwardNanos(20L);
call = resourceDiscoveryCalls.poll();
call.verifyRequest(LDS, LDS_RESOURCE, "63", "", NODE);
call.verifyRequest(RDS, RDS_RESOURCE, "5", "", NODE);
@ -2550,8 +2554,8 @@ public abstract class ClientXdsClientTestBase {
inOrder.verify(backoffPolicy2).nextBackoffNanos();
retryTask =
Iterables.getOnlyElement(fakeClock.getPendingTasks(RPC_RETRY_TASK_FILTER));
assertThat(retryTask.getDelay(TimeUnit.NANOSECONDS)).isEqualTo(20L);
fakeClock.forwardNanos(20L);
assertThat(retryTask.getDelay(TimeUnit.NANOSECONDS)).isEqualTo(200L);
fakeClock.forwardNanos(200L);
call = resourceDiscoveryCalls.poll();
call.verifyRequest(LDS, LDS_RESOURCE, "63", "", NODE);
call.verifyRequest(RDS, RDS_RESOURCE, "5", "", NODE);