PIP-2: Introduce non-persistent topics #538

rdhabalia · 2017-06-28T23:58:23Z

Motivation

Replacing #476 (due to rebase conflicts and namespace-configuration implementation) , and creating this PR on top of #452.

Modifications

Broker can be configured to start in a mode:

Load only persistent topic
Load only non-persistent topic
Load both kind of topics

Load-manager gets topic-lookup request and assigns it to broker which supports that topic. Broker fails to load topics if it doesn't support that type of topic.

Result

Broker can start in a mode where it can serve only non-persistent topic.

saandrews · 2017-07-12T18:43:02Z

This commit is trying to do more than just making broker configurable to own non persistent topics. Or is it due to PR #452 is not merged yet?

rdhabalia · 2017-07-12T18:55:39Z

This commit is trying to do more than just making broker configurable to own non persistent topics. Or is it due to PR #452 is not merged yet?

Yes, it has two commits but you can review this PR specific commits at db8e757c7

saandrews · 2017-07-12T21:24:53Z

pulsar-broker/src/test/java/org/apache/pulsar/client/api/NonPersistentTopicTest.java

+                fail("topic loading should have failed");
+            } catch (Exception e) {
+                // Ok
+            }


Shouldn't it attempt to create persistent topic and ensure it is ok?

actually in this test we start broker in non-persistent mode and we try to load persistent topic which will fail because load-manager doesn't find any broker which support persistent-topic.

However, producer retries to do lookup and recreate but here, we have put the timeout on producer-creation which will timeout and completes the test.
pulsarClient.createProducerAsync(topicName, producerConf).get(1, TimeUnit.SECONDS);

saandrews · 2017-07-12T21:26:50Z

pulsar-broker/src/test/java/org/apache/pulsar/client/api/NonPersistentTopicTest.java

+        }
+
+    }
+


Do we have a case where both type is enabled and topic creation succeeds?

we have two testcases: one with non-persistent enabled broker other one without it. In other cases broker has default configuration to load both types of topics.

merlimat

Change looks good to me. I'd like to see a bit more of code sharing with the persistent version of the dispatcher/subscription/replicator.

merlimat · 2017-07-24T23:43:22Z

pulsar-common/src/main/java/org/apache/pulsar/policies/data/loadbalancer/LoadReport.java

@@ -42,6 +42,9 @@
    private final String webServiceUrlTls;
    private final String pulsarServiceUrl;
    private final String pulsarServiceUrlTls;
+    private boolean enablePersistentTopics=true;


Minor and probably a bit of nit-picking. Here it should be referring on wether the feature is "enabled" or "disabled", rather than be imperative ("enable").

Should we rename to persistentTopicsEnabled, nonPersistentTopicsEnabled?

merlimat · 2017-07-24T23:44:32Z

pulsar-broker/src/main/java/org/apache/pulsar/common/naming/NamespaceBundle.java

@@ -35,6 +35,9 @@
    private final NamespaceName nsname;
    private final Range<Long> keyRange;
    private final NamespaceBundleFactory factory;
+    // TODO: remove this once we remove broker persistent/non-persistent mode configuration


Can you create a github issue for the TODO and mention it here?

merlimat · 2017-07-24T23:50:14Z

managed-ledger/src/main/java/org/apache/bookkeeper/mledger/impl/EntryCacheManager.java

@@ -236,5 +238,9 @@ public int compareTo(EntryCache other) {

    }

+    public static Entry create(long ledgerId, long entryId, ByteBuf data) {


Is this change still needed?

yes, for non-persistent topics we want to create Entry with specific ledgerId-entryId and payload so, it can be pass to other entities (eg: dispatcher, consumer) as those entities APIs requires a Entry wrapper to pass payload/msgId information.

merlimat · 2017-07-25T00:27:04Z

pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/AdminResource.java

@@ -103,6 +109,8 @@ protected String domain() {
            return "topic";
        } else if (uri.getPath().startsWith("persistent/")) {
            return "persistent";
+        } else if (uri.getPath().startsWith("non-persistent/")) {


Side note: should we remove queue and topic here?

merlimat · 2017-07-25T04:56:52Z

...org/apache/pulsar/broker/service/nonpersistent/NonPersistentDispatcherMultipleConsumers.java

+        return TOTAL_AVAILABLE_PERMITS_UPDATER.get(this) > 0;
+    }
+
+    private Consumer getNextConsumer() {


Can this logic be shared with the persistent version of the dispatcher?
(Maybe using an abstract class?)

Sure, I will again visit it to share things across both the persistent/non-persistent entitites.

Great, you can introduce some base class like AbstractDispatcherMultipleConsumers with the common logic.

merlimat · 2017-07-25T04:58:03Z

.../apache/pulsar/broker/service/nonpersistent/NonPersistentDispatcherSingleActiveConsumer.java

+        ACTIVE_CONSUMER_UPDATER.set(this, null);
+    }
+
+    private void pickAndScheduleActiveConsumer() {


Same here, most of these methods looks very similar to the "persistent" version. Share the same code if possible.

merlimat · 2017-07-25T05:14:16Z

...er/src/main/java/org/apache/pulsar/broker/service/nonpersistent/NonPersistentReplicator.java

+
+    }
+
+    public void sendMessage(Entry entry) {


Is it possible to share any logic with the other replicator?

merlimat · 2017-07-25T18:43:39Z

@rdhabalia One small issue I'm seeing on the CLI tool:

$ bin/pulsar-admin non-persistent stats non-persistent://prop/cluster/ns/my-topic
Need to provide a persistent topic name

Usage: pulsar-admin non-persistent [options] [command] [command options]
  Commands:
....

merlimat · 2017-07-25T18:54:30Z

One more exception in broker :

2017-07-25 11:53:32,957 - ERROR - [pulsar-stats-updater-73-1:PulsarStats@121] - Failed to generate topic stats for topic non-persistent://prop/cluster/ns/my-topic: org.apache.pulsar.common.policies.data.PublisherStats cannot be cast to org.apache.pulsar.common.policies.data.NonPersistentPublisherStats
java.lang.ClassCastException: org.apache.pulsar.common.policies.data.PublisherStats cannot be cast to org.apache.pulsar.common.policies.data.NonPersistentPublisherStats
	at org.apache.pulsar.broker.service.nonpersistent.NonPersistentTopic.lambda$updateRates$23(NonPersistentTopic.java:607)
	at org.apache.pulsar.common.util.collections.ConcurrentOpenHashSet$Section.forEach(ConcurrentOpenHashSet.java:405)
	at org.apache.pulsar.common.util.collections.ConcurrentOpenHashSet.forEach(ConcurrentOpenHashSet.java:135)
	at org.apache.pulsar.broker.service.nonpersistent.NonPersistentTopic.updateRates(NonPersistentTopic.java:605)
	at org.apache.pulsar.broker.service.PulsarStats.lambda$null$1(PulsarStats.java:118)
	at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:386)
	at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:160)
	at org.apache.pulsar.broker.service.PulsarStats.lambda$null$2(PulsarStats.java:116)
	at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:386)
	at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:160)
	at org.apache.pulsar.broker.service.PulsarStats.lambda$updateStats$3(PulsarStats.java:108)
	at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap$Section.forEach(ConcurrentOpenHashMap.java:386)
	at org.apache.pulsar.common.util.collections.ConcurrentOpenHashMap.forEach(ConcurrentOpenHashMap.java:160)
	at org.apache.pulsar.broker.service.PulsarStats.updateStats(PulsarStats.java:98)
	at org.apache.pulsar.broker.service.BrokerService.updateRates(BrokerService.java:752)
	at org.apache.bookkeeper.mledger.util.SafeRun$1.safeRun(SafeRun.java:30)
	at org.apache.bookkeeper.util.SafeRunnable.run(SafeRunnable.java:31)

rdhabalia · 2017-07-25T18:59:52Z

One small issue I'm seeing on the CLI tool:

yes, thanks for catching it. I will fix it.

exception
java.lang.ClassCastException: org.apache.pulsar.common.policies.data.PublisherStats cannot be cast to org.apache.pulsar.common.policies.data.NonPersistentPublisherStats

Yes, yesterday, I have added commit to get messageDrop stats for non-persistent topic and added inherited stats-class for non-persistent topics, which caused this one. I will fix it as well.

merlimat · 2017-07-26T23:09:08Z

@rdhabalia One test failure seems genuine :

Tests run: 521, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 996.983 sec <<< FAILURE! - in TestSuite
testClosingReplicationProducerTwice(org.apache.pulsar.broker.service.PersistentTopicTest)  Time elapsed: 0.025 sec  <<< FAILURE!
java.lang.NoSuchFieldException: producerConfiguration
	at org.apache.pulsar.broker.service.PersistentTopicTest.testClosingReplicationProducerTwice(PersistentTopicTest.java:954)

rdhabalia · 2017-07-26T23:32:47Z

testClosingReplicationProducerTwice(org.apache.pulsar.broker.service.PersistentTopicTest) Time elapsed: 0.025 sec <<< FAILURE!
java.lang.NoSuchFieldException: producerConfiguration

Actually I had fixed it as part of last commit, it was failing becauseit was trying to get field-variable using reflection which was moved to AbstractParentClass. Build is also green.

I have addressed all your comments. However, I still have to add stats documentation for non-persistent topic. Also, I have added msgDrop stat for publisher and subscription, which also shows up for persistent topic. Therefore, I was thinking to extend non-persistent stats from existing stats so, msgDrop doesn't show up for persistent-topic.

merlimat · 2017-07-27T18:15:07Z

@rdhabalia I'm running a 1 prod - 1 cons test with non-persistent. Everything local.

At the rate of 10K write/s, with no batching, I'm seeing the consumer is getting 1msg/s dropped. Ideally that should not happen since the system is not really overloaded.

merlimat · 2017-07-27T18:15:29Z

$ bin/pulsar-admin non-persistent stats non-persistent://prop/cluster/ns/my-topic
{
  "msgRateIn" : 10000.319421984088,
  "msgThroughputIn" : 1.0550336990193212E7,
  "msgRateOut" : 9998.314769761299,
  "msgThroughputOut" : 1.054822208209817E7,
  "averageMsgSize" : 1055.0,
  "storageSize" : 0,
  "publishers" : [ {
    "msgRateIn" : 10000.319421984088,
    "msgThroughputIn" : 1.0550336990193212E7,
    "averageMsgSize" : 1055.0,
    "producerId" : 0,
    "producerName" : "standalone-1-3",
    "address" : "/127.0.0.1:51246",
    "connectedSince" : "2017-07-27 11:10:49.446-0700",
    "clientVersion" : "1.19-incubating-SNAPSHOT",
    "msgDropRate" : 0.0
  } ],
  "subscriptions" : {
    "sub" : {
      "msgRateOut" : 9998.314769761299,
      "msgThroughputOut" : 1.054822208209817E7,
      "msgRateRedeliver" : 0.0,
      "msgBacklog" : 0,
      "blockedSubscriptionOnUnackedMsgs" : false,
      "unackedMessages" : 0,
      "type" : "Exclusive",
      "msgRateExpired" : 0.0,
      "consumers" : [ {
        "msgRateOut" : 9998.314769761299,
        "msgThroughputOut" : 1.054822208209817E7,
        "msgRateRedeliver" : 0.0,
        "consumerName" : "0ce8d",
        "availablePermits" : 791,
        "unackedMessages" : 0,
        "blockedConsumerOnUnackedMsgs" : false,
        "address" : "/127.0.0.1:51080",
        "connectedSince" : "2017-07-27 11:07:36.213-0700",
        "clientVersion" : "1.19-incubating-SNAPSHOT"
      } ],
      "msgDropRate" : 1.9501263804427469
    }
  },
  "replication" : { },
  "msgDropRate" : 0.0
}

rdhabalia · 2017-07-27T18:37:13Z

At the rate of 10K write/s, with no batching

I feel it's happening due to not available permits?

We drop the message for subscription in two cases:

not enough permits
socket is not writable

In this case, it seems like consumer is not having enough permits? Let me run perf test again with debug log to confirm the behavior.

merlimat · 2017-07-27T18:38:43Z

I feel it's happening due to not available permits?

Not sure, I increased to 50K receiver queue size and it still happens

merlimat · 2017-07-27T18:39:03Z

       "consumerName" : "28513",
        "availablePermits" : 417242,
        "unackedMessages" : 0,
        "blockedConsumerOnUnackedMsgs" : false,
        "address" : "/127.0.0.1:52409",
        "connectedSince" : "2017-07-27 11:33:51.270-0700",
        "clientVersion" : "1.19-incubating-SNAPSHOT"
      } ],
      "msgDropRate" : 3.1666701082037405

merlimat · 2017-07-27T18:39:36Z

This was even with 500K permits

merlimat

Change looks overall good to me. Just the concern about dropped messages in seemingly normal conditions.

Also, I would say to mark it as "Experimental" in the documentation, to set the right expectation, and notice that implementation details might still be changed in future releases.

merlimat · 2017-07-27T18:23:16Z

pulsar-broker/src/main/java/org/apache/pulsar/broker/admin/PersistentTopics.java

@@ -775,15 +775,20 @@ public void skipAllMessages(@PathParam("property") String property, @PathParam("
            }
        } else {
            validateAdminOperationOnDestination(dn, authoritative);
-            PersistentTopic topic = getTopicReference(dn);
+            if (!(getTopicReference(dn) instanceof PersistentTopic)) {


Why do we need to check if it's persistent topic? Shouldn't this already be guaranteed by having this handler on /admin/persistent/... ?

merlimat · 2017-07-27T18:34:57Z

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/Producer.java

@@ -56,6 +58,8 @@
    private final long producerId;
    private final String appId;
    private Rate msgIn;
+    // it records msg-drop rate only for non-persistent topic
+    private Rate msgDrop;


Can this be final? And maybe we can set to null if it's persistent topic.

merlimat · 2017-07-27T18:37:57Z

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

@@ -100,6 +102,8 @@ public ServerCnx(BrokerService service) {
        this.producers = new ConcurrentLongHashMap<>(8, 1);
        this.consumers = new ConcurrentLongHashMap<>(8, 1);
        this.replicatorPrefix = service.pulsar().getConfiguration().getReplicatorPrefix();
+        this.nonPersistentMessageSemaphore = new Semaphore(


All the events from the same connections are coming from same thread. Even when we write, we typically switch to the event loop thread for that connection.

Given that, the semaphore could just be a regular (non even volatile variable` that we check and increment. No need for thread safety.

so, you mean instead semaphore we can have just a counter like pendingSendRequest, but then we need to decrement this counter on completedSendOperation() and that called from a different thread.
so, it might not be a thread-safe and it might not throttle with accurate configured number? right?

But the completedSendOperation() is already called within the io thread, so an addition unlocked variable should be fine.

Actually, for non-persistent topic it is been called from ordered-executor thread. So, counter will be incremented by io-thread and decrement by ordered-thread. Not, sure if it would be thread-safe in terms throttling with correct count.
so, do you still think it would be fine to keep one unlock counter variable would be fine here or it should be atomic?

merlimat · 2017-07-27T18:40:55Z

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

+        if (producer.isNonPersistentTopic() && !nonPersistentMessageSemaphore.tryAcquire()) {
+            final long producerId = send.getProducerId();
+            final long sequenceId = send.getSequenceId();
+            service.getTopicOrderedExecutor().submitOrdered(producer.getTopic(), SafeRun.safeRun(() -> {


Why schedule it in ordered thread? We are in the io thread, we should write it already from this thread.

actually, we have to write it in ordered thread only else send-ack goes in random order and because of that client will not receive sequenceId in order and it will fail the pending msgs and close connection.

if msg doesn't throttle here then broker processes it by delivering it to subscribers in ordered thread and after completion that ordered thread sends ack back to client.

so, all the sending-ack operation has to be in ordered-thread only.

Uhm, but why wait for dispatching message to consumers before sending ack to producer?

I think the best option here is to send ack immediately to producer. We got the message in broker memory, that's the level of guarantee.

Later if the consumers are not ready, the message will be dropped.

merlimat · 2017-07-27T18:42:01Z

pulsar-broker/src/main/java/org/apache/pulsar/broker/service/ServerCnx.java

        if (--pendingSendRequest == ResumeReadsThreshold) {
            // Resume reading from socket
            ctx.channel().config().setAutoRead(true);
        }
+        if (isNonPersistentTopic) {
+            nonPersistentMessageSemaphore.release();


As I was mentioning above, the pendingSendRequest is already a counter of pending requests from the producer and it's not synchronized or a semaphore.

merlimat · 2017-07-27T18:46:34Z

pulsar-common/src/main/java/org/apache/pulsar/common/policies/data/PublisherStats.java

@@ -46,7 +46,7 @@

    /** Client library version */
    public String clientVersion;
-
+    


White spaces addition

merlimat · 2017-07-27T18:46:40Z

pulsar-common/src/main/java/org/apache/pulsar/common/policies/data/ReplicatorStats.java

@@ -57,7 +57,7 @@

    /** Timestamp of outbound connection establishment time */
    public String outboundConnectedSince;
-
+    


White spaces addition

merlimat · 2017-07-27T18:46:50Z

pulsar-common/src/main/java/org/apache/pulsar/common/policies/data/SubscriptionStats.java

@@ -55,8 +55,8 @@

    /** List of connected consumers on this subscription w/ their stats */
    public List<ConsumerStats> consumers;
-
-    public PersistentSubscriptionStats() {
+


White spaces addition

merlimat · 2017-07-27T19:00:11Z

@rdhabalia One other note: If I enable batching the drop-rate falls to 0.016 /s though I suspect it's only counting the number of dropped batches

rdhabalia · 2017-07-27T19:17:48Z

At the rate of 10K write/s, with no batching

after adding more debug logs where we record-msg drop: found out that all the message-drop happened due to connection is not writable.
Before sending message we check permits/currentConsumer.isWritable() and 3 out of 20K message dropped due to connection is not writable as it fails on condition currentConsumer.isWritable()(cnx-IO thread is not ready to process the request)

rdhabalia · 2017-07-27T19:21:26Z

If I enable batching the drop-rate falls to 0.016 /s though I suspect it's only counting the number of dropped batches

yes, we record msg-drop at dispatcher when consumer is not available/cnx-writable so, we don't deserialize message-metadata to get actual count.
But, it's a good point. we can deserialize entry to get actual count from batch-message. I will make that change.

merlimat · 2017-07-27T20:11:55Z

@rdhabalia One other thing is what happens when a subscriptions has no more consumers available. Right now the subscription stays around. Is that the intended behavior? I feel it's not really needed to be kept, since messages will be dropped anyway.

…thread

merlimat

👍 Nice work!

rdhabalia added the type/enhancement The enhancements for the existing features or docs. e.g. reduce memory usage of the delayed messages label Jun 28, 2017

rdhabalia added this to the 1.19 milestone Jun 28, 2017

rdhabalia self-assigned this Jun 28, 2017

This was referenced Jun 28, 2017

Make broker configurable to own non-persistent namespace #476

Closed

add non-persistent topic documentation #532

Merged

rdhabalia force-pushed the nonPersist_configure branch from f258517 to db8e757 Compare June 29, 2017 01:35

rdhabalia mentioned this pull request Jul 10, 2017

Introduce non-persistent topic #451

Closed

rdhabalia requested review from merlimat and saandrews July 11, 2017 20:26

saandrews reviewed Jul 12, 2017

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merlimat reviewed Jul 25, 2017

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rdhabalia mentioned this pull request Jul 25, 2017

Remove non-persistent broker-mode once broker can handle both types of topic properly #596

Closed

merlimat changed the title ~~Make broker configurable to own non-persistent topic~~ Introduce non-persistent topics Jul 25, 2017

merlimat changed the title ~~Introduce non-persistent topics~~ PIP-2: Introduce non-persistent topics Jul 25, 2017

rdhabalia force-pushed the nonPersist_configure branch 4 times, most recently from 175db00 to f8a1192 Compare July 26, 2017 07:27

rdhabalia force-pushed the nonPersist_configure branch 2 times, most recently from e35dba9 to 238f37c Compare July 27, 2017 01:59

rdhabalia and others added 3 commits July 26, 2017 23:07

Introduce non-persistent topic and tests

a282cff

Make broker configurable to own non-persistent topic

5c0f42b

add producer/sub message-drop stats

9e80ccf

rdhabalia added 6 commits July 26, 2017 23:07

cleanup and rename variable name

c363bcc

fix: cli topic-name validation + update-stats

670ed2f

added abstract parent class dispatcher and replicator

9989b6f

fix: reflection test

77e5c76

added non-persistent stats classes

2d211af

add non-persistent topic stats documentation

669e7a9

rdhabalia force-pushed the nonPersist_configure branch from 238f37c to 669e7a9 Compare July 27, 2017 06:18

merlimat reviewed Jul 27, 2017

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formating + batch-number counting for msg-drop + ack-publish on same …

50fdd31

…thread

rdhabalia force-pushed the nonPersist_configure branch from 60d3dd7 to 50fdd31 Compare July 27, 2017 22:40

replace semaphore with counter for maxNonPersistentPendingMessages

883af92

rdhabalia force-pushed the nonPersist_configure branch from fa7fa9a to 883af92 Compare July 28, 2017 00:11

merlimat approved these changes Jul 28, 2017

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merlimat merged commit 380e47e into apache:master Jul 28, 2017

rdhabalia mentioned this pull request Jul 28, 2017

Introduce non-persistent topic and tests #452

Closed

rdhabalia deleted the nonPersist_configure branch September 1, 2017 18:27

rdhabalia mentioned this pull request Feb 28, 2019

Remove broker mode to handle persistent/non-persistent topics separately #3348

Merged

		@@ -236,5 +238,9 @@ public int compareTo(EntryCache other) {

		}

		public static Entry create(long ledgerId, long entryId, ByteBuf data) {

		@@ -46,7 +46,7 @@

		/** Client library version */
		public String clientVersion;

		@@ -57,7 +57,7 @@

		/** Timestamp of outbound connection establishment time */
		public String outboundConnectedSince;

PIP-2: Introduce non-persistent topics #538

PIP-2: Introduce non-persistent topics #538

Conversation

rdhabalia commented Jun 28, 2017

Motivation

Modifications

Result

saandrews commented Jul 12, 2017

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