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Posted to commits@pinot.apache.org by ja...@apache.org on 2019/05/28 22:39:28 UTC
[incubator-pinot] branch master updated: Make
ControllerLeadershipManager thread-safe and register it to PARTICIPANT
HelixManager (#4245)
This is an automated email from the ASF dual-hosted git repository.
jackie pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-pinot.git
The following commit(s) were added to refs/heads/master by this push:
new 106c5a0 Make ControllerLeadershipManager thread-safe and register it to PARTICIPANT HelixManager (#4245)
106c5a0 is described below
commit 106c5a071c3cdffabf2d48c4c2de2255ca72038f
Author: Xiaotian (Jackie) Jiang <17...@users.noreply.github.com>
AuthorDate: Tue May 28 15:39:23 2019 -0700
Make ControllerLeadershipManager thread-safe and register it to PARTICIPANT HelixManager (#4245)
ControllerLeadershipManager should be registered to PARTICIPANT HelixManager instead of CONTROLLER HelixManager so that the Helix callbacks and custom callbacks won't affect each other.
---
.../controller/ControllerLeadershipManager.java | 78 +++++++++++-----------
.../apache/pinot/controller/ControllerStarter.java | 17 ++---
.../controller/helix/PinotControllerModeTest.java | 5 +-
3 files changed, 52 insertions(+), 48 deletions(-)
diff --git a/pinot-controller/src/main/java/org/apache/pinot/controller/ControllerLeadershipManager.java b/pinot-controller/src/main/java/org/apache/pinot/controller/ControllerLeadershipManager.java
index 035b22d..7d4705e 100644
--- a/pinot-controller/src/main/java/org/apache/pinot/controller/ControllerLeadershipManager.java
+++ b/pinot-controller/src/main/java/org/apache/pinot/controller/ControllerLeadershipManager.java
@@ -18,10 +18,10 @@
*/
package org.apache.pinot.controller;
+import java.util.HashMap;
import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
+import javax.annotation.concurrent.ThreadSafe;
import org.apache.helix.HelixManager;
-import org.apache.helix.api.listeners.ControllerChangeListener;
import org.apache.pinot.common.metrics.ControllerGauge;
import org.apache.pinot.common.metrics.ControllerMetrics;
import org.slf4j.Logger;
@@ -29,40 +29,56 @@ import org.slf4j.LoggerFactory;
/**
- * Single place for listening on controller changes
- * This should be created at controller startup and everyone who wants to listen to controller changes should subscribe
+ * Single place for listening on controller changes.
+ * This should be created at controller startup and everyone who wants to listen to controller changes should subscribe.
*/
+@ThreadSafe
public class ControllerLeadershipManager {
-
private static final Logger LOGGER = LoggerFactory.getLogger(ControllerLeadershipManager.class);
- private HelixManager _helixManager;
- private ControllerMetrics _controllerMetrics;
- private volatile boolean _amILeader = false;
+ private final HelixManager _helixControllerManager;
+ private final ControllerMetrics _controllerMetrics;
- private Map<String, LeadershipChangeSubscriber> _subscribers = new ConcurrentHashMap<>();
+ private Map<String, LeadershipChangeSubscriber> _subscribers = new HashMap<>();
+ private boolean _amILeader = false;
- public ControllerLeadershipManager(HelixManager helixManager, ControllerMetrics controllerMetrics) {
- _helixManager = helixManager;
+ public ControllerLeadershipManager(HelixManager helixControllerManager, ControllerMetrics controllerMetrics) {
+ _helixControllerManager = helixControllerManager;
_controllerMetrics = controllerMetrics;
- _helixManager.addControllerListener((ControllerChangeListener) notificationContext -> onControllerChange());
_controllerMetrics.setValueOfGlobalGauge(ControllerGauge.PINOT_CONTROLLER_LEADER, 0L);
}
/**
- * When stopping this service, if the controller is leader, invoke {@link ControllerLeadershipManager#onBecomingNonLeader()}
+ * Subscribes to changes in the controller leadership.
+ * <p>If controller is already leader, invoke {@link LeadershipChangeSubscriber#onBecomingLeader()}
+ */
+ public synchronized void subscribe(String name, LeadershipChangeSubscriber subscriber) {
+ LOGGER.info("{} subscribing to leadership changes", name);
+ _subscribers.put(name, subscriber);
+ if (_amILeader) {
+ subscriber.onBecomingLeader();
+ }
+ }
+
+ public boolean isLeader() {
+ return _amILeader;
+ }
+
+ /**
+ * Stops the service.
+ * <p>If controller is leader, invoke {@link ControllerLeadershipManager#onBecomingNonLeader()}
*/
- public void stop() {
+ public synchronized void stop() {
if (_amILeader) {
onBecomingNonLeader();
}
}
/**
- * Callback on changes in the controller
+ * Callback on changes in the controller. Should be registered to the controller callback.
*/
- protected void onControllerChange() {
- if (_helixManager.isLeader()) {
+ synchronized void onControllerChange() {
+ if (_helixControllerManager.isLeader()) {
if (!_amILeader) {
_amILeader = true;
LOGGER.info("Became leader");
@@ -81,35 +97,21 @@ public class ControllerLeadershipManager {
}
}
- public boolean isLeader() {
- return _amILeader;
- }
-
private void onBecomingLeader() {
long startTimeMs = System.currentTimeMillis();
_controllerMetrics.setValueOfGlobalGauge(ControllerGauge.PINOT_CONTROLLER_LEADER, 1L);
- _subscribers.forEach((k, v) -> v.onBecomingLeader());
- LOGGER.info("Finished on becoming leader in {}ms", (System.currentTimeMillis() - startTimeMs));
+ for (LeadershipChangeSubscriber subscriber : _subscribers.values()) {
+ subscriber.onBecomingLeader();
+ }
+ LOGGER.info("Finished on becoming leader in {}ms", System.currentTimeMillis() - startTimeMs);
}
private void onBecomingNonLeader() {
long startTimeMs = System.currentTimeMillis();
_controllerMetrics.setValueOfGlobalGauge(ControllerGauge.PINOT_CONTROLLER_LEADER, 0L);
- _subscribers.forEach((k, v) -> v.onBecomingNonLeader());
- LOGGER.info("Finished on becoming non-leader in {}ms", (System.currentTimeMillis() - startTimeMs));
- }
-
- /**
- * Subscribe to changes in the controller leadership
- * If controller is already leader, invoke {@link LeadershipChangeSubscriber#onBecomingLeader()}
- * @param name
- * @param subscriber
- */
- public void subscribe(String name, LeadershipChangeSubscriber subscriber) {
- LOGGER.info("{} subscribing to leadership changes", name);
- _subscribers.put(name, subscriber);
- if (_amILeader) {
- subscriber.onBecomingLeader();
+ for (LeadershipChangeSubscriber subscriber : _subscribers.values()) {
+ subscriber.onBecomingNonLeader();
}
+ LOGGER.info("Finished on becoming non-leader in {}ms", System.currentTimeMillis() - startTimeMs);
}
}
diff --git a/pinot-controller/src/main/java/org/apache/pinot/controller/ControllerStarter.java b/pinot-controller/src/main/java/org/apache/pinot/controller/ControllerStarter.java
index 7e09e7a..67a306f 100644
--- a/pinot-controller/src/main/java/org/apache/pinot/controller/ControllerStarter.java
+++ b/pinot-controller/src/main/java/org/apache/pinot/controller/ControllerStarter.java
@@ -37,6 +37,7 @@ import org.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
import org.apache.commons.io.FileUtils;
import org.apache.helix.HelixManager;
import org.apache.helix.SystemPropertyKeys;
+import org.apache.helix.api.listeners.ControllerChangeListener;
import org.apache.helix.task.TaskDriver;
import org.apache.pinot.common.Utils;
import org.apache.pinot.common.metrics.ControllerMeter;
@@ -230,6 +231,9 @@ public class ControllerStarter {
() -> _controllerMetrics.addMeteredGlobalValue(ControllerMeter.HELIX_ZOOKEEPER_RECONNECTS, 1L));
_serviceStatusCallbackList.add(generateServiceStatusCallback(_helixControllerManager));
+
+ LOGGER.info("Initializing controller leadership manager");
+ _controllerLeadershipManager = new ControllerLeadershipManager(_helixControllerManager, _controllerMetrics);
}
private void setUpPinotController() {
@@ -249,14 +253,11 @@ public class ControllerStarter {
_helixResourceManager.start();
HelixManager helixParticipantManager = _helixResourceManager.getHelixZkManager();
- LOGGER.info("Init controller leadership manager");
- // Note: Currently leadership depends on helix controller, thus assign helixControllerManager to ControllerLeadershipManager.
- // TODO: In the future when Helix separation is completed, leadership only depends on the master in leadControllerResource, and ControllerLeadershipManager will be removed.
- if (_helixControllerManager != null) {
- _controllerLeadershipManager = new ControllerLeadershipManager(_helixControllerManager, _controllerMetrics);
- } else {
- _controllerLeadershipManager = new ControllerLeadershipManager(helixParticipantManager, _controllerMetrics);
- }
+ LOGGER.info("Registering controller leadership manager");
+ // TODO: when Helix separation is completed, leadership only depends on the master in leadControllerResource, remove
+ // ControllerLeadershipManager and this callback.
+ helixParticipantManager.addControllerListener(
+ (ControllerChangeListener) changeContext -> _controllerLeadershipManager.onControllerChange());
LOGGER.info("Starting task resource manager");
_helixTaskResourceManager = new PinotHelixTaskResourceManager(new TaskDriver(helixParticipantManager));
diff --git a/pinot-controller/src/test/java/org/apache/pinot/controller/helix/PinotControllerModeTest.java b/pinot-controller/src/test/java/org/apache/pinot/controller/helix/PinotControllerModeTest.java
index 4de3034..f3da797 100644
--- a/pinot-controller/src/test/java/org/apache/pinot/controller/helix/PinotControllerModeTest.java
+++ b/pinot-controller/src/test/java/org/apache/pinot/controller/helix/PinotControllerModeTest.java
@@ -71,10 +71,11 @@ public class PinotControllerModeTest extends ControllerTest {
_controllerStarter = null;
}
- @Test
+ // TODO: enable it after removing ControllerLeadershipManager which requires both CONTROLLER and PARTICIPANT
+ // HelixManager
+ @Test (enabled = false)
public void testPinotOnlyController()
throws Exception {
-
config.setControllerMode(ControllerConf.ControllerMode.PINOT_ONLY);
config.setControllerPort(Integer.toString(Integer.parseInt(config.getControllerPort()) + controllerPortOffset++));
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