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Add a a delay to task in CommitLogCheckpointAction (#1554)

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* Add delay to task
This commit is contained in:
Rachel Guan 2022-03-15 10:49:35 -04:00 • committed by GitHub
parent d418008d27
commit 74b7ec052f
2 changed files with 25 additions and 8 deletions
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24
core/src/main/java/google/registry/backup/CommitLogCheckpointAction.java
View file

@ -28,11 +28,11 @@ import google.registry.model.ofy.CommitLogCheckpointRoot;
import google.registry.request.Action;
import google.registry.request.Action.Service;
import google.registry.request.auth.Auth;
import google.registry.util.Clock;
import google.registry.util.CloudTasksUtils;
import java.util.Optional;
import javax.inject.Inject;
import org.joda.time.DateTime;
import org.joda.time.Duration;
/**
* Action that saves commit log checkpoints to Datastore and kicks off a diff export task.
@ -57,7 +57,22 @@ public final class CommitLogCheckpointAction implements Runnable {
private static final String QUEUE_NAME = "export-commits";
@Inject Clock clock;
/**
* The amount of time enqueueing should be delayed.
*
* <p>The {@link ExportCommitLogDiffAction} is enqueued in {@link CommitLogCheckpointAction},
* which is inside a Datastore transaction that persists the checkpoint to be exported. After the
* switch to CloudTasks API, the task may be invoked before the Datastore transaction commits.
* When this happens, the checkpoint is not found which leads to {@link
* com.google.common.base.VerifyException}.
*
* <p>In order to invoke the task after the transaction commits, a reasonable delay should be
* added to each task. The latency of the request is mostly in the range of 4-6 seconds; Choosing
* a value 30% greater than the upper bound should solve the issue invoking a task before the
* transaction commits.
*/
static final Duration ENQUEUE_DELAY_SECONDS = Duration.standardSeconds(8);
@Inject CommitLogCheckpointStrategy strategy;
@Inject CloudTasksUtils cloudTasksUtils;
@ -96,14 +111,15 @@ public final class CommitLogCheckpointAction implements Runnable {
// Enqueue a diff task between previous and current checkpoints.
cloudTasksUtils.enqueue(
QUEUE_NAME,
cloudTasksUtils.createPostTask(
cloudTasksUtils.createPostTaskWithDelay(
ExportCommitLogDiffAction.PATH,
Service.BACKEND.toString(),
ImmutableMultimap.of(
LOWER_CHECKPOINT_TIME_PARAM,
lastWrittenTime.toString(),
UPPER_CHECKPOINT_TIME_PARAM,
checkpoint.getCheckpointTime().toString())));
checkpoint.getCheckpointTime().toString()),
ENQUEUE_DELAY_SECONDS));
return true;
});
return isCheckPointPersisted ? Optional.of(checkpoint) : Optional.empty();

9
core/src/test/java/google/registry/backup/CommitLogCheckpointActionTest.java
View file

@ -47,11 +47,10 @@ public class CommitLogCheckpointActionTest {
private DateTime now = DateTime.now(UTC);
private CommitLogCheckpointAction task = new CommitLogCheckpointAction();
private final CloudTasksHelper cloudTasksHelper = new CloudTasksHelper();
private final CloudTasksHelper cloudTasksHelper = new CloudTasksHelper(new FakeClock(now));
@BeforeEach
void beforeEach() {
task.clock = new FakeClock(now);
task.strategy = strategy;
task.cloudTasksUtils = cloudTasksHelper.getTestCloudTasksUtils();
when(strategy.computeCheckpoint())
@ -68,7 +67,8 @@ public class CommitLogCheckpointActionTest {
new TaskMatcher()
.url(ExportCommitLogDiffAction.PATH)
.param(ExportCommitLogDiffAction.LOWER_CHECKPOINT_TIME_PARAM, START_OF_TIME.toString())
.param(ExportCommitLogDiffAction.UPPER_CHECKPOINT_TIME_PARAM, now.toString()));
.param(ExportCommitLogDiffAction.UPPER_CHECKPOINT_TIME_PARAM, now.toString())
.scheduleTime(now.plus(CommitLogCheckpointAction.ENQUEUE_DELAY_SECONDS)));
assertThat(loadRoot().getLastWrittenTime()).isEqualTo(now);
}
@ -82,7 +82,8 @@ public class CommitLogCheckpointActionTest {
new TaskMatcher()
.url(ExportCommitLogDiffAction.PATH)
.param(ExportCommitLogDiffAction.LOWER_CHECKPOINT_TIME_PARAM, oneMinuteAgo.toString())
.param(ExportCommitLogDiffAction.UPPER_CHECKPOINT_TIME_PARAM, now.toString()));
.param(ExportCommitLogDiffAction.UPPER_CHECKPOINT_TIME_PARAM, now.toString())
.scheduleTime(now.plus(CommitLogCheckpointAction.ENQUEUE_DELAY_SECONDS)));
assertThat(loadRoot().getLastWrittenTime()).isEqualTo(now);
}