Add AlterISR RPC and use it for ISR modifications by mumrah · Pull Request #9100 · apache/kafka

mumrah · 2020-07-29T21:05:27Z

Background

On the broker side, ISR changes in the following cases:

Follow catches up to the leader, we expand the ISR
On a timer, we check for followers which have fallen out of sync, we shrink the ISR

Previously, we would synchronously update the partition state in ZK which includes the current leader+epoch as well as the ISR. The ZK version is used for concurrency control and is known to the broker (kept in LeaderAndIsr struct). In order to notify the controller of the ISR changes, the leader would periodically write to a special "isr_change_notification" znode which the controlled kept a ZK watch on. A list of modified partitions was written to this znode so the controller would only reload the necessary ISRs.

With KIP-497, we introduce an asynchronous ISR workflow that makes the controller the only component which can change the ISR state.

TLDR

ISR updates are now sent asynchronously to the controller
ISRs are now only persisted by the controller
Leader can immediately assume a larger ISR during ISR expansion
No more ZK watch mechanism for ISR propagation
Gated behind IBP 2.7-IV2

Broker changes

Now when the broker wants to modify the ISR, it will send an AlterIsr request to the controller. Since this request can include any number of partition's ISR modifications, we will want to allow batching of ISR updates. This is done by adding a small delay (50ms) before sending the request to the controller after an ISR change is requested. By adding this delay, other ISR changes can accumulate before getting sent off as a single AlterIsr request.

Once the controller makes the update, it will return the updated ISR to the leader and send UpdateMetadata requests to the other interested brokers. As specified in the KIP, while a leader is waiting on the controller to respond it will assume the largest ISR (i.e., the union of the actual ISR and the pending ISR). For ISR expansions, this allows the leader to assume the new ISR right away. For ISR shrinks however, the leader must wait for confirmation from the controller that the ISR has been persisted (see the KIP for more details). We call this oversubscribed ISR the "maximal" ISR

A new AlterIsrManager class is added which accumulates ISR changes and uses a background BrokerToControllerChannelManager thread to send AlterIsr requests to the controller.

The use of AlterIsr is only enabled when a broker is configured with IBP version 2.7-IV2 or greater.

Controller changes

A new AlterIsrReceived controller event is added along with supporting methods for handling AlterIsr requests from KafkaApis as well as actually processing the request and modifying ZooKeeper. The proposed ISRs are validated against the controller's metadata before writing to ZK. Once all of the ISRs have been written out (or failed), the controller will return the AlterIsr response which includes the updated ISRs and zk versions.

After returning the response, the controller will then send out UpdateMetadata requests for all partitions included in the AlterIsr request.

In order to support rolling upgrades and brokers on older IBP, the controller will accept AlterIsr and monitor the ZK watch for ISR changes. Once we fully migrate away from ZK, AlterIsr will be the only mechanism for updating the ISR.

Configs

TODO

Metrics

TODO

…ter-isr

* Make AlterIsr block until Controller process it fully * Batch AlterIsr requests for a short while on broker side * Don't attempt to restrict to a single in-flight request

mumrah · 2020-08-05T13:58:00Z

+  def alterIsrs(alterIsrRequest: AlterIsrRequestData, callback: AlterIsrResponseData => Unit): Unit = {
+    val isrsToAlter = mutable.Map[TopicPartition, LeaderAndIsr]()
+
+    alterIsrRequest.topics().forEach(topicReq => topicReq.partitions().forEach(partitionReq => {


It might be simpler just to use AlterIsrRequestData and AlterIsrResponseData throughout this code (rather than converting to Map[TopicPartition, LeaderAndIsr] and Map[TopicPartition, Errors])

The conversion logic is a tad annoying, but it makes the rest of the code nicer. I'm ok with it. That said, could we use scala conventions, e.g.:

alterIsrRequest.topics.forEach { topicReq => topicReq.partitions.forEach { partitionReq =>

…ter-isr

hachikuji

Thanks. Left a few comments. I haven't looked closely at the controller logic yet.

hachikuji · 2020-08-12T17:21:31Z

+          })
+        })
+
+        def responseHandler(response: ClientResponse): Unit = {


I think the basic approach here is to ignore successful responses and wait for the LeaderAndIsr update. I am wondering how we should handle the case when the update failed. Say for example that our update fails with the INVALID_VERSION error. Inside Partition, we will still have the pendingIsr set. Do we need to clear it? How about other errors?

I found a race during the system tests when a follower is shutting down. The controller handles the shut down before it handles an AlterIsr. If the proposed ISR includes the now-offline replica, the controller refuses to update that ISR change and returns an error for that partition. It then sends out the current LeaderAndIsr.

The problem is that the broker ignores this LeaderAndIsr since it has the same leader epoch. This is easy enough to fix, we can bump the leader epoch in the controller (and ZK) before sending it out.

However, there's still the case of failing to update ZK. I think we should probably treat this the same way as an offline replica. If we simply return an error in AlterIsr response and let the leader reset the pending ISR state, the leader will just retry with stale metadata and the update will fail again.

I think in all these error cases we must bump the leader epoch to force the leader to accept the new LeaderAndIsr. Thoughts?

Continued in #9100 (comment)

hachikuji · 2020-08-12T17:32:22Z

+  override def clearPending(topicPartition: TopicPartition): Unit = {
+    pendingIsrUpdates synchronized {
+      // when we get a new LeaderAndIsr, we clear out any pending requests
+      pendingIsrUpdates.remove(topicPartition)


Removal from this set won't prevent BrokerToControllerRequestThread from retrying in-flight requests. I'm considering whether we should have a way to cancel requests that we are still awaiting.

With the latest changes to prevent multiple in-flight requests, I don't think this should happen for a given partition. Even if it did, the retried in-flight request from BrokerToControllerRequestThread would fail on the controller with an old version.

I'm wondering if we even need this clearPending behavior. Since I changed the AlterIsr request to fire at most after 50ms, it's a narrow window between enqueueing an ISR update and receiving a LeaderAndIsr.

Update: after some discussion and looking over failed system tests, we ended up with the following error handling:

REPLICA_NOT_AVAILABLE and INVALID_REPLICA_ASSIGNMENT will clear the pending ISR to let the leader retry. This covers a case where a leader tries to add a replica to the ISR which is offline because it (the follower) just finished shutdown.

INVALID_UPDATE_VERSION will not clear the pending ISR since the broker has stale metadata.

FENCED_LEADER_EPOCH, NOT_LEADER_OR_FOLLOWER, UNKNOWN_TOPIC_OR_PARTITION will not clear the pending state and therefor will not retry. We presume here that the controller is correct and the leader has old metadata. By not clearing the pending ISR, the leader will await LeaderAndIsr before attempting any further ISR changes

Other unspecified errors: clear the pending state and let the leader retry. Not sure what cases could cause other errors, but it is probably better to be in a retry loop than to be completely stuck

…ter-isr

Also fix some short circuit bugs in controller

…ter-isr

mumrah · 2020-09-15T17:25:32Z

Recent changes include:

Controller no longer sends LeaderAndIsr, only UpdateMetadata (more more leader epoch bump)
Update Partition's ISR from AlterIsr response
Periodic scheduled thread for calling "propagateIsrChanges" in AlterIsrManager (we could miss updates otherwise)
Top-level error handling in AlterIsrManager
Additional checks in AlterIsrManager to prevent multiple in-flight requests and also prevent multiple ISR changes for a
given partition
Changes to the callback logic to ensure we don't leave any partitions stuck

hachikuji · 2020-09-16T18:05:34Z

+  def handleAlterIsrRequest(request: RequestChannel.Request): Unit = {
+    val alterIsrRequest = request.body[AlterIsrRequest]
+
+    if (!controller.isActive) {


I think authorization should probably be the first thing we do.

This is actually a really good point. I filed a JIRA to fix this in other places in KafkaApis https://issues.apache.org/jira/browse/KAFKA-10491

hachikuji · 2020-09-16T18:07:02Z

-              if (requestLeaderEpoch > currentLeaderEpoch) {
+              val currentZkVersion = partition.getZkVersion
+              val requestZkVersion = partitionState.zkVersion
+              if (requestLeaderEpoch > currentLeaderEpoch || requestZkVersion > currentZkVersion) {


Do we still need this change? I think we are trying to keep the current approach where the controller bumps the leader epoch for any controller-initiated change.

No, we don't need this anymore. This was added so a LeaderAndIsr could update the Partition state without a leader epoch bump, but we don't have that flow anymore so we can revert this.

* Lots of cleanup, logging improvements * Changes to AlterIsr RPC field names * Consolidate on maximal ISR name * Introduce sealed trait for different ISR states * Tweaks to some error handling

…ter-isr

hachikuji · 2020-09-17T18:28:13Z

-        // if it is not in the ISR yet
-        if (!inSyncReplicaIds.contains(followerId))
+        // Check if this in-sync replica needs to be added to the ISR. We look at the "maximal" ISR here so we don't
+        // send an additional Alter ISR request for the same replica


Another possibility is that the replica is pending removal in which case another AlterIsr will be needed. I think it might be more intuitive to make this check:

if (!isrState.inflight && !isrState.isr.contains(followerId))

Yea checking the maximal set isn't needed anymore since adding the sealed trait. I'll just update this to simply call maybeExpandIsr which will do the check you propose here

hachikuji · 2020-09-17T19:03:35Z


  private def needsExpandIsr(followerReplica: Replica): Boolean = {
-    leaderLogIfLocal.exists { leaderLog =>
+    !hasInFlightAlterIsr && leaderLogIfLocal.exists { leaderLog =>


I think we can refactor this a little bit to avoid some duplication and inconsistency. We have the following logic above when updating follower state:

if (!isrState.maximalIsr.contains(followerId)) maybeExpandIsr(followerReplica, followerFetchTimeMs)

This is a little inconsistent because here we are checking isrState.isr. I'd suggest splitting this method into something like the following:

def hasReachedHighWatermark(follower: Replica): Boolean = { leaderLogIfLocal.exists { leaderLog => val leaderHighwatermark = leaderLog.highWatermark isFollowerInSync(follower, leaderHighwatermark) } } def canAddToIsr(followerId: Int): Boolean = { val current = isrState !current.inflight && !current.isr.contains(followerId) } def needsExpandIsr(follower: Replica): Boolean = { canAddToIsr(follower.brokerId) && hasReachedHighWatermark(follower) }

Then we can change the logic in maybeExpandIsr to the following:

val needsIsrUpdate = canAddToIsr(followerReplica) && inReadLock(leaderIsrUpdateLock) { ...

hachikuji · 2020-09-17T19:10:10Z

          val outOfSyncReplicaIds = getOutOfSyncReplicas(replicaLagTimeMaxMs)
          if (outOfSyncReplicaIds.nonEmpty) {
-            val newInSyncReplicaIds = inSyncReplicaIds -- outOfSyncReplicaIds
+            val newInSyncReplicaIds = isrState.isr -- outOfSyncReplicaIds


Seems like we do not have a check for inflight AlterIsr after the write lock has been acquired.

hachikuji · 2020-09-17T19:10:50Z

     *
     **/
-    val candidateReplicaIds = inSyncReplicaIds - localBrokerId
+    val candidateReplicaIds = isrState.maximalIsr - localBrokerId


This is related to my comment above for the ISR expansion case, but it is a bit confusing to use maximal ISR when the expectation is that we will not shrink as long as we have a pending update inflight. Would it be better to check for inflights and document that this method will return an empty set as long as there is a pending AlterIsr request?

Makes sense, that will also satisfy your other comment about not checking for inflight requests within the write lock

Also, yes it's confusing to refer to maximalIsr here even though it should always equal the committed ISR at this point (assuming we check for inflight first).

hachikuji · 2020-09-17T20:25:23Z

    partition.maybeShrinkIsr()
-    assertEquals(Set(brokerId), partition.inSyncReplicaIds)
-    assertEquals(10L, partition.localLogOrException.highWatermark)
+    assertEquals(alterIsrManager.isrUpdates.size, 1)


I may have missed it, but do we have tests which verify error handling? I see tests which verify requests get sent, but at a quick glance I didn't see tests of responses.

* Cleaned up expand/shrink ISR methods * Style stuff * Logging stuff

hachikuji

@mumrah One additional thought occurred to me. After the controller receives an AlterIsr request and updates the partition state, I think we need to call onPartitionReassignment to see if there is a pending reassignment which can be completed.

…ter-isr

mumrah · 2020-09-23T20:25:08Z

@hachikuji yea, good catch. This works today using a ZK watch on the partition "/state" znode which is still getting triggered with this PR. We can modify the new ISR update path to explicitly call onPartitionReassignment after writing out the ISR. How about we save this as a follow-on?

hachikuji · 2020-09-24T16:42:08Z

Yeah, I'm ok leaving that for https://issues.apache.org/jira/browse/KAFKA-10521.

hachikuji · 2020-09-24T17:13:35Z

+          val partitionError: Errors = controllerContext.partitionLeadershipInfo(tp) match {
+            case Some(leaderIsrAndControllerEpoch) =>
+              val currentLeaderAndIsr = leaderIsrAndControllerEpoch.leaderAndIsr
+              if (newLeaderAndIsr.leaderEpoch < currentLeaderAndIsr.leaderEpoch) {


Consider the following scenario:

broker sends AlterIsr

the update succeeds but the response is lost

broker retries AlterIsr

Currently the leader will be stuck after 3) because it has no way to get the latest LeaderAndIsr state if the first attempt fails. To handle this, I think we need to add an idempotence check here. After we have validated the leader epoch, if the intended state matches the current state, then we can just return the current state.

I was trying to think some kind of race with a zombie leader trying to update the ISR, however this would get fenced by the leader epoch. This should be pretty easy to add

hachikuji · 2020-09-24T17:18:40Z

+            debug(s"Controller failed to update ISR to ${proposedIsr.mkString(",")} since we sent an old leader epoch. Giving up.")
+          case Errors.INVALID_UPDATE_VERSION =>
+            debug(s"Controller failed to update ISR to ${proposedIsr.mkString(",")} due to invalid zk version. Retrying.")
+            sendAlterIsrRequest(isrState)


It might make more sense to handle this case similarly to FENCED_LEADER_EPOCH. Retrying won't help since we know our version will be rejected Come to think of it, this would be kind of a strange error to hit in the current implementation which only allows one request inflight at a time. For controller-initiated changes, we'd expect to hit FENCED_LEADER_EPOCH. Anyway, I think it's still worth keeping the error.

hachikuji · 2020-09-24T17:23:03Z

+            sendAlterIsrRequest(isrState)
+          case _ =>
+            warn(s"Controller failed to update ISR to ${proposedIsr.mkString(",")} due to $error. Retrying.")
+            sendAlterIsrRequest(isrState)


Is there any way that we could end up retrying after the pending ISR state had already been reset? I know we have AlterIsrManager.clearPending, but that only removes the partition from the unsent queue. How do we handle inflight AlterIsr requests after the state has been reset. Seems like it might be worth adding a check here to validate whether the request is still needed.

True, we could see a new ISR from controller initiated changes via LeaderAndIsr while our request is in-flight. We have a check for this on successful responses, but we should also check here. Since our request failed, we don't have a leaderEpoch to check against so I think the best we can do is see if isrState is still pending before re-sending the request

* Make AlterIsr idempotent in the controller * Tweak some error handling * Add a few tests * Style feedback

hachikuji

LGTM. I left a few more nits which can be saved for a follow-up.

hachikuji · 2020-09-24T23:13:45Z

+              warn(s"Controller failed to update ISR to ${proposedIsr.mkString(",")} due to $error. Retrying.")
+              sendAlterIsrRequest(isrState)
+            } else {
+              warn(s"Ignoring failed ISR update to ${proposedIsr.mkString(",")} since due to $error since we have a committed ISR.")


nit (for follow-up): fix grammar "since due"

hachikuji · 2020-09-24T23:16:38Z

  }

+  /**
+   * This is called for each partition in the body of an AlterIsr response. For errors which are non-retryable we simply


nit: conventionally we prefer "retriable"

hachikuji · 2020-09-24T23:17:43Z

+                partitionResponses(tp) = Left(Errors.FENCED_LEADER_EPOCH)
+                None
+              } else if (newLeaderAndIsr.equalsIgnoreZk(currentLeaderAndIsr)) {
+                // If a partition is already in the desired state, just return it


It might be worth mentioning that this could happen in the case of a retry after a successful update.

hachikuji · 2020-09-24T23:18:19Z

        alterIsrRequest.getErrorResponse(requestThrottleMs, Errors.CLUSTER_AUTHORIZATION_FAILED.exception))
+    } else if (!controller.isActive) {
+      sendResponseMaybeThrottle(request, requestThrottleMs =>
+        alterIsrRequest.getErrorResponse(requestThrottleMs, Errors.NOT_CONTROLLER.exception()))


nit: leave off parenthesis after exception

hachikuji · 2020-09-24T23:24:24Z

I think the failing tests are known flakes and should be fixed by https://issues.apache.org/jira/browse/KAFKA-10514.

jacky1193610322 · 2020-09-26T06:27:27Z

I got a thought, there is a scenario that A leader can see its followers, but cannot see Zookeeper, and then the leader will be fenced when it attempts to shink isr or expand isr because it holds the leaderIsrUpdateLock, but now the leader can't be fenced because it just sends the message and will process message normally. when the ack=1, it will continue processing the msg, and will be lost. should we reject process the msg when the alterisr find the broker is not in liveBrokerIdAndEpochs? click me

hachikuji · 2020-11-18T01:27:41Z

@jacky1193610322 I missed this comment before. It's a good question. In general, the leader will continue in its current state as long as possible. As you say, as soon as it needs to shrink/expand the ISR, it grabs the leaderAndIsr update and attempts to synchronously update the state. If Zookeeper can't be reached, then the thread gets stuck. Eventually this causes the broker to effectively deadlock, which has the side effect of preventing any Produce requests (and any other requests) from getting through.

I think it's a fair point that this affords some protection for acks=1 requests, but I think we tend to view the side effect of deadlocking the broker as worse than any benefit. In KIP-500, we have an alternative approach for self-fencing. The analogous case is when the leader cannot reach the controller. We use a heartbeating mechanism to maintain liveness in the cluster. Unlike with Zookeeper, we do not rely on the session expiration event in order to tell that a broker has been declared dead. Instead if we do not get a heartbeat response from the controller before some timeout, then we will stop accepting Produce requests.

I have been thinking a little bit about your suggestion to self-fence after getting an invalid version error from AlterIsr. It might help in the interim before KIP-500 is complete. I think our expectation here was that if we get an invalid version error, then the LeaderAndIsr with the updated state should soon be on the way. I suppose we could come up with reasons why that assumption might fail, so it might make sense to be a little more defensive. I will file a jira about this and we can see what others think. Thanks for the suggestion!

jacky1193610322 · 2020-11-18T03:15:10Z

Thanks for your reply, I also have read KIP-500 and other KIP-631, It's good about the fence. but it will be released in a few months, before that, I think we also need to try the best to fence the broker when the controller already think the broker has died. In other words, we should fence 2-way.
self-fence after getting an invalid version error from AlterIsr
yes, I think we need self-fence when the session is lost, we can't rely on receiving the other machine’s response because we can't receive the response when the Broker2ControllerChannel is broken.
please let me know if you create a jira.

mumrah added 4 commits July 29, 2020 17:04

Checking in RPCs and stubbing out basic functionality

37f7c63

Update the ISR from the controller

19dd93a

Merge remote-tracking branch 'apache-github/trunk' into KAFKA-8836-al…

5482529

…ter-isr

Start working on broker-side of AlterIsr

6fb2551

hachikuji reviewed Aug 3, 2020

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cmccabe reviewed Aug 5, 2020

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Comment thread core/src/main/scala/kafka/cluster/Partition.scala

cmccabe reviewed Aug 5, 2020

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Comment thread core/src/main/scala/kafka/server/BrokerToControllerChannelManager.scala

cmccabe reviewed Aug 5, 2020

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Comment thread core/src/main/scala/kafka/server/AlterIsrChannelManager.scala Outdated

mumrah added 3 commits August 5, 2020 09:45

Add throttle time to AlterIsr, fix error counts

5955b1d

Broker to controller AlterIsr fixes

afeb18e

* Make AlterIsr block until Controller process it fully * Batch AlterIsr requests for a short while on broker side * Don't attempt to restrict to a single in-flight request

Add "effective" ISR to Partition

627b26a

mumrah commented Aug 5, 2020

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Comment thread core/src/main/scala/kafka/controller/KafkaController.scala Outdated

mumrah commented Aug 5, 2020

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Comment thread core/src/main/scala/kafka/server/AlterIsrChannelManager.scala Outdated

mumrah commented Aug 5, 2020

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Comment thread core/src/main/scala/kafka/server/AlterIsrChannelManager.scala Outdated

mumrah commented Aug 5, 2020

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Comment thread core/src/main/scala/kafka/server/AlterIsrChannelManager.scala Outdated

mumrah added 2 commits August 7, 2020 16:31

Merge remote-tracking branch 'apache-github/trunk' into KAFKA-8836-al…

fe99911

…ter-isr

PartitionTest and ReplicaManagerTest passing

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hachikuji reviewed Aug 12, 2020

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mumrah added 11 commits August 13, 2020 17:04

PR feedback and progress on unit tests

10b7d63

Merge remote-tracking branch 'apache-github/trunk' into KAFKA-8836-al…

da33368

…ter-isr

PR feedback, minor nits mostly

1d98ada

Gate AlterIsr on IBP

b7577f1

Add back ReplicaManager's ISR propagation thread

9c7afa1

WIP tests

4cc58a3

Merge remote-tracking branch 'apache-github/trunk' into KAFKA-8836-al…

f557a86

…ter-isr

Back something out

8c9183b

Tests WIP

1e20e9c

Add some debug logging for test

93ac630

Make sure to always send LeaderAndIsr after AlterIsr

ccda535

mumrah added 7 commits September 10, 2020 14:35

More PR feedback, mostly style stuff

7ef9a0d

Make sure we set throttle time on the response

4e5685c

Also fix some short circuit bugs in controller

Use a queue instead of map inside AlterIsrManager

02e7378

Trying something different in AlterIsrManager

31f9126

Cleanup and adding more unit tests

d00c066

Fix unit tests

ff4f5b2

Merge remote-tracking branch 'apache-github/trunk' into KAFKA-8836-al…

392472e

…ter-isr

fixup after merge

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hachikuji reviewed Sep 16, 2020

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mumrah added 3 commits September 16, 2020 15:21

Partially revert startup ordering

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More PR feedback

47878b0

* Lots of cleanup, logging improvements * Changes to AlterIsr RPC field names * Consolidate on maximal ISR name * Introduce sealed trait for different ISR states * Tweaks to some error handling

Merge remote-tracking branch 'apache-github/trunk' into KAFKA-8836-al…

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…ter-isr

hachikuji reviewed Sep 17, 2020

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mumrah added 2 commits September 17, 2020 19:04

More PR feedback

1dde0e4

* Cleaned up expand/shrink ISR methods * Style stuff * Logging stuff

Two small test things

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hachikuji reviewed Sep 21, 2020

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Merge remote-tracking branch 'apache-github/trunk' into KAFKA-8836-al…

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…ter-isr

hachikuji reviewed Sep 24, 2020

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Next round of PR feedback

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* Make AlterIsr idempotent in the controller * Tweak some error handling * Add a few tests * Style feedback

hachikuji approved these changes Sep 24, 2020

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hachikuji merged commit 57de67d into apache:trunk Sep 24, 2020

mumrah mentioned this pull request Dec 2, 2020

KAFKA-10799 AlterIsr utilizes ReplicaManager ISR metrics #9677

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mumrah commented Jul 29, 2020 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Background

TLDR

Broker changes

Controller changes

Configs

Metrics

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mumrah Aug 21, 2020 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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mumrah commented Sep 15, 2020

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mumrah commented Jul 29, 2020 •

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