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Posted to jira@kafka.apache.org by GitBox <gi...@apache.org> on 2021/02/10 17:52:40 UTC
[GitHub] [kafka] rondagostino commented on a change in pull request #10090: Upstream BrokerMetadataListener and related classes
rondagostino commented on a change in pull request #10090:
URL: https://github.com/apache/kafka/pull/10090#discussion_r573925637
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File path: core/src/main/scala/kafka/server/metadata/BrokerMetadataListener.scala
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@@ -0,0 +1,260 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package kafka.server.metadata
+
+import java.util
+import java.util.concurrent.TimeUnit
+import kafka.coordinator.group.GroupCoordinator
+import kafka.coordinator.transaction.TransactionCoordinator
+import kafka.log.LogManager
+import kafka.metrics.KafkaMetricsGroup
+import kafka.server.{RaftReplicaManager, RequestHandlerHelper}
+import org.apache.kafka.common.config.ConfigResource
+import org.apache.kafka.common.metadata.MetadataRecordType._
+import org.apache.kafka.common.metadata._
+import org.apache.kafka.common.protocol.ApiMessage
+import org.apache.kafka.common.utils.{LogContext, Time}
+import org.apache.kafka.metalog.{MetaLogLeader, MetaLogListener}
+import org.apache.kafka.queue.{EventQueue, KafkaEventQueue}
+
+import scala.jdk.CollectionConverters._
+
+object BrokerMetadataListener{
+ val MetadataBatchProcessingTimeUs = "MetadataBatchProcessingTimeUs"
+ val MetadataBatchSizes = "MetadataBatchSizes"
+}
+
+class BrokerMetadataListener(val brokerId: Int,
+ val time: Time,
+ val metadataCache: RaftMetadataCache,
+ val configRepository: LocalConfigRepository,
+ val groupCoordinator: GroupCoordinator,
+ val replicaManager: RaftReplicaManager,
+ val txnCoordinator: TransactionCoordinator,
+ val logManager: LogManager,
+ val threadNamePrefix: Option[String]
+ ) extends MetaLogListener with KafkaMetricsGroup {
+ val logContext = new LogContext(s"[BrokerMetadataListener id=${brokerId}] ")
+ val log = logContext.logger(classOf[BrokerMetadataListener])
Review comment:
`private`?
##########
File path: core/src/main/scala/kafka/server/metadata/BrokerMetadataListener.scala
##########
@@ -0,0 +1,260 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package kafka.server.metadata
+
+import java.util
+import java.util.concurrent.TimeUnit
+import kafka.coordinator.group.GroupCoordinator
+import kafka.coordinator.transaction.TransactionCoordinator
+import kafka.log.LogManager
+import kafka.metrics.KafkaMetricsGroup
+import kafka.server.{RaftReplicaManager, RequestHandlerHelper}
+import org.apache.kafka.common.config.ConfigResource
+import org.apache.kafka.common.metadata.MetadataRecordType._
+import org.apache.kafka.common.metadata._
+import org.apache.kafka.common.protocol.ApiMessage
+import org.apache.kafka.common.utils.{LogContext, Time}
+import org.apache.kafka.metalog.{MetaLogLeader, MetaLogListener}
+import org.apache.kafka.queue.{EventQueue, KafkaEventQueue}
+
+import scala.jdk.CollectionConverters._
+
+object BrokerMetadataListener{
+ val MetadataBatchProcessingTimeUs = "MetadataBatchProcessingTimeUs"
+ val MetadataBatchSizes = "MetadataBatchSizes"
+}
+
+class BrokerMetadataListener(val brokerId: Int,
+ val time: Time,
+ val metadataCache: RaftMetadataCache,
+ val configRepository: LocalConfigRepository,
+ val groupCoordinator: GroupCoordinator,
+ val replicaManager: RaftReplicaManager,
+ val txnCoordinator: TransactionCoordinator,
+ val logManager: LogManager,
+ val threadNamePrefix: Option[String]
+ ) extends MetaLogListener with KafkaMetricsGroup {
Review comment:
Do any of these really need `val`?
##########
File path: core/src/main/scala/kafka/server/metadata/BrokerMetadataListener.scala
##########
@@ -0,0 +1,260 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package kafka.server.metadata
+
+import java.util
+import java.util.concurrent.TimeUnit
+import kafka.coordinator.group.GroupCoordinator
+import kafka.coordinator.transaction.TransactionCoordinator
+import kafka.log.LogManager
+import kafka.metrics.KafkaMetricsGroup
+import kafka.server.{RaftReplicaManager, RequestHandlerHelper}
+import org.apache.kafka.common.config.ConfigResource
+import org.apache.kafka.common.metadata.MetadataRecordType._
+import org.apache.kafka.common.metadata._
+import org.apache.kafka.common.protocol.ApiMessage
+import org.apache.kafka.common.utils.{LogContext, Time}
+import org.apache.kafka.metalog.{MetaLogLeader, MetaLogListener}
+import org.apache.kafka.queue.{EventQueue, KafkaEventQueue}
+
+import scala.jdk.CollectionConverters._
+
+object BrokerMetadataListener{
+ val MetadataBatchProcessingTimeUs = "MetadataBatchProcessingTimeUs"
+ val MetadataBatchSizes = "MetadataBatchSizes"
+}
+
+class BrokerMetadataListener(val brokerId: Int,
+ val time: Time,
+ val metadataCache: RaftMetadataCache,
+ val configRepository: LocalConfigRepository,
+ val groupCoordinator: GroupCoordinator,
+ val replicaManager: RaftReplicaManager,
+ val txnCoordinator: TransactionCoordinator,
+ val logManager: LogManager,
+ val threadNamePrefix: Option[String]
+ ) extends MetaLogListener with KafkaMetricsGroup {
+ val logContext = new LogContext(s"[BrokerMetadataListener id=${brokerId}] ")
+ val log = logContext.logger(classOf[BrokerMetadataListener])
+ logIdent = logContext.logPrefix()
+
+ /**
+ * A histogram tracking the time in microseconds it took to process batches of events.
+ */
+ private val batchProcessingTimeHist = newHistogram(BrokerMetadataListener.MetadataBatchProcessingTimeUs)
+
+ /**
+ * A histogram tracking the sizes of batches that we have processed.
+ */
+ private val metadataBatchSizeHist = newHistogram(BrokerMetadataListener.MetadataBatchSizes)
+
+ /**
+ * The highest metadata offset that we've seen. Written only from the event queue thread.
+ */
+ @volatile private var _highestMetadataOffset = -1L
+
+ val eventQueue = new KafkaEventQueue(time, logContext, threadNamePrefix.getOrElse(""))
+
+ def highestMetadataOffset(): Long = _highestMetadataOffset
+
+ /**
+ * Handle new metadata records.
+ */
+ override def handleCommits(lastOffset: Long, records: util.List[ApiMessage]): Unit = {
+ eventQueue.append(new HandleCommitsEvent(lastOffset, records))
+ }
+
+ class HandleCommitsEvent(lastOffset: Long,
+ records: util.List[ApiMessage])
+ extends EventQueue.FailureLoggingEvent(log) {
+ override def run(): Unit = {
+ if (isDebugEnabled) {
+ debug(s"Metadata batch ${lastOffset}: handling ${records.size()} record(s).")
+ }
+ val imageBuilder =
+ MetadataImageBuilder(brokerId, log, metadataCache.currentImage())
+ val startNs = time.nanoseconds()
+ var index = 0
+ metadataBatchSizeHist.update(records.size())
+ records.iterator().asScala.foreach { case record =>
+ try {
+ if (isTraceEnabled) {
+ trace("Metadata batch %d: processing [%d/%d]: %s.".format(lastOffset, index + 1,
+ records.size(), record.toString()))
+ }
+ handleMessage(imageBuilder, record, lastOffset)
+ } catch {
+ case e: Exception => error(s"Unable to handle record ${index} in batch " +
+ s"ending at offset ${lastOffset}", e)
+ }
Review comment:
Perhaps not to resolve now, but I think error conditions like this might need more thought. Should the broker die? If so, how would the broker ever come back up if it can't get past a particular batch? But what is the impact of not processing the remaining messages in a batch, and is that always acceptable or just sometimes acceptable? Do we need metrics to track these error events? It seems an error log message might not be sufficient?
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