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https://issues.apache.org/jira/browse/GEODE-8241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17136150#comment-17136150
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ASF GitHub Bot commented on GEODE-8241:
---------------------------------------
aaronlindsey commented on a change in pull request #5236:
URL: https://github.com/apache/geode/pull/5236#discussion_r440451304
##########
File path:
geode-membership/src/integrationTest/java/org/apache/geode/distributed/internal/membership/gms/MembershipIntegrationTest.java
##########
@@ -172,6 +181,92 @@ public void
secondMembershipCanJoinUsingTheSecondLocatorToStart()
stop(locator2, locator1);
}
+ @Test
+ public void secondMembershipPausesForLocatorWaitTime()
+ throws IOException, MemberStartupException {
+
+ /*
+ * Start a locator for the coordinator (membership) so we have a port for
it.
+ *
+ * Its locator-wait-time is set to 0 so it eventually (soon after
membership is started) forms a
+ * distributed system and becomes a coordinator.
+ */
+
+ final MembershipLocator<MemberIdentifier> coordinatorLocator =
createLocator(0);
+ coordinatorLocator.start();
+ final int coordinatorLocatorPort = coordinatorLocator.getPort();
+
+ final Membership<MemberIdentifier> coordinatorMembership =
+ createMembership(coordinatorLocator, coordinatorLocatorPort);
+
+ /*
+ * We have not even started the membership yet — connection attempts will
certainly fail until
+ * we do. This is a bit like the locator (host) not being present in DNS
(yet).
+ */
+
+ /*
+ * Start a second locator and membership trying to join via the
coordinator (membership) that
+ * hasn't yet started behind the port.
+ *
+ * Set its locator-wait-time so it'll not become a coordinator right away,
allowing time for the
+ * other member to start and become a coordinator.
+ *
+ * Calculate the locator-wait-time to be greater than the minimum wait
time for connecting to a
+ * locator.
+ */
+
+ final MembershipLocator<MemberIdentifier> lateJoiningLocator =
createLocator(0);
+ lateJoiningLocator.start();
+ final int lateJoiningLocatorPort = lateJoiningLocator.getPort();
+
+ final int[] lateJoiningMembershipLocatorPorts =
+ new int[] {coordinatorLocatorPort, lateJoiningLocatorPort};
+
+ final Duration minimumJoinWaitTime = Duration
+ .ofMillis(JOIN_RETRY_SLEEP + FIND_LOCATOR_RETRY_SLEEP) // amount of
sleep time per retry
+ .multipliedBy(lateJoiningMembershipLocatorPorts.length * 2); //
expected number of retries
+ final int locatorWaitTime = (int) (3 * minimumJoinWaitTime.getSeconds());
+
+ final MembershipConfig lateJoiningMembershipConfig =
+ createMembershipConfig(true, locatorWaitTime,
lateJoiningMembershipLocatorPorts);
+ final Membership<MemberIdentifier> lateJoiningMembership =
+ createMembership(lateJoiningMembershipConfig, lateJoiningLocator);
+
+ CompletableFuture<Void> lateJoiningMembershipStartup =
executorServiceRule.runAsync(() -> {
+ try {
+ start(lateJoiningMembership);
+ } catch (MemberStartupException e) {
+ throw new RuntimeException(e);
+ }
+ });
+
+ /*
+ * Now start the coordinator (membership), after waiting longer than the
minimum wait time for
+ * connecting to a locator but shorter than the locator-wait-time.
+ */
+
+ CompletableFuture<Void> coordinatorMembershipStartup =
executorServiceRule.runAsync(() -> {
+ try {
+ Thread.sleep(2 * minimumJoinWaitTime.toMillis());
Review comment:
Again, `minimumJoinWaitTime` is the minimum amount of time a locator
will wait to become a coordinator. We are just trying to make sure we sleep for
longer than the minimum but shorter than the `locator-wait-time` so we can
detect whether the `lateJoiningMembership` is waiting for the full
`locator-wait-time` and not just the minimum wait time.
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> Locator does not observe locator-wait-time
> ------------------------------------------
>
> Key: GEODE-8241
> URL: https://issues.apache.org/jira/browse/GEODE-8241
> Project: Geode
> Issue Type: Bug
> Reporter: Aaron Lindsey
> Assignee: Aaron Lindsey
> Priority: Major
>
> In the case where a locator starts up and is unable to connect to any other
> locators, it may decide to become the membership coordinator even if
> locator-wait-time has not elapsed.
> The following conditional from GMSJoinLeave.java causes the issue. There
> should be an additional check for locator-wait-time before becoming
> coordinator.
> {code:java}
> if (state.joinedMembersContacted <= 0 &&
> (tries >= minimumRetriesBeforeBecomingCoordinator ||
> state.locatorsContacted >= locators.size())) {
> synchronized (viewInstallationLock) {
> becomeCoordinator();
> }
> return true;
> }
> {code}
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