mumrah commented on a change in pull request #10366:
URL: https://github.com/apache/kafka/pull/10366#discussion_r606355983
##########
File path:
metadata/src/main/java/org/apache/kafka/controller/ClientQuotaControlManager.java
##########
@@ -272,4 +276,44 @@ private ApiError validateEntity(ClientQuotaEntity entity,
Map<String, String> va
return ApiError.NONE;
}
+
+ class ClientQuotaControlIterator implements
Iterator<List<ApiMessageAndVersion>> {
+ private final long epoch;
+ private final Iterator<Entry<ClientQuotaEntity,
TimelineHashMap<String, Double>>> iterator;
+
+ ClientQuotaControlIterator(long epoch) {
+ this.epoch = epoch;
+ this.iterator = clientQuotaData.entrySet(epoch).iterator();
Review comment:
Since we're getting the entry set of a particular epoch, does this mean
we'll be getting consistent snapshots?
##########
File path:
metadata/src/main/java/org/apache/kafka/controller/QuorumController.java
##########
@@ -301,6 +328,89 @@ private void appendControlEvent(String name, Runnable
handler) {
queue.append(event);
}
+ private static final String GENERATE_SNAPSHOT = "generateSnapshot";
+
+ private static final int MAX_BATCHES_PER_GENERATE_CALL = 10;
+
+ class SnapshotGeneratorManager implements Runnable {
+ private final Function<Long, SnapshotWriter> writerBuilder;
+ private final ExponentialBackoff exponentialBackoff =
+ new ExponentialBackoff(10, 2, 5000, 0);
+ private SnapshotGenerator generator = null;
+
+ SnapshotGeneratorManager(Function<Long, SnapshotWriter> writerBuilder)
{
+ this.writerBuilder = writerBuilder;
+ }
+
+ void createSnapshotGenerator(long epoch) {
Review comment:
Do we need to check to see if this epoch is known or valid?
##########
File path:
metadata/src/main/java/org/apache/kafka/controller/SnapshotGenerator.java
##########
@@ -0,0 +1,146 @@
+/*
+ * 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 org.apache.kafka.controller;
+
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.List;
+import java.util.OptionalLong;
+
+import org.apache.kafka.common.utils.ExponentialBackoff;
+import org.apache.kafka.common.utils.LogContext;
+import org.apache.kafka.metadata.ApiMessageAndVersion;
+import org.slf4j.Logger;
+
+
+final class SnapshotGenerator {
+ static class Section {
+ private final String name;
+ private final Iterator<List<ApiMessageAndVersion>> iterator;
+
+ Section(String name, Iterator<List<ApiMessageAndVersion>> iterator) {
+ this.name = name;
+ this.iterator = iterator;
+ }
+
+ String name() {
+ return name;
+ }
+
+ Iterator<List<ApiMessageAndVersion>> iterator() {
+ return iterator;
+ }
+ }
+
+ private final Logger log;
+ private final SnapshotWriter writer;
+ private final int maxBatchesPerGenerateCall;
+ private final ExponentialBackoff exponentialBackoff;
+ private final List<Section> sections;
+ private final Iterator<Section> sectionIterator;
+ private Iterator<List<ApiMessageAndVersion>> batchIterator;
+ private List<ApiMessageAndVersion> batch;
+ private Section section;
+ private long numRecords;
+ private long numWriteTries;
+
+ SnapshotGenerator(LogContext logContext,
+ SnapshotWriter writer,
+ int maxBatchesPerGenerateCall,
+ ExponentialBackoff exponentialBackoff,
+ List<Section> sections) {
+ this.log = logContext.logger(SnapshotGenerator.class);
+ this.writer = writer;
+ this.maxBatchesPerGenerateCall = maxBatchesPerGenerateCall;
+ this.exponentialBackoff = exponentialBackoff;
+ this.sections = sections;
+ this.sectionIterator = this.sections.iterator();
+ this.batchIterator = Collections.emptyIterator();
+ this.batch = null;
+ this.section = null;
+ this.numRecords = 0;
+ this.numWriteTries = 0;
+ }
+
+ /**
+ * Returns the epoch of the snapshot that we are generating.
+ */
+ long epoch() {
+ return writer.epoch();
+ }
+
+ SnapshotWriter writer() {
+ return writer;
+ }
+
+ /**
+ * Generate the next batch of records.
+ *
+ * @return 0 if a batch was sent to the writer,
+ * -1 if there are no more batches to generate,
+ * or the number of times we tried to write and the writer
+ * was busy, otherwise.
+ */
+ private long generateBatch() throws Exception {
+ if (batch == null) {
+ while (!batchIterator.hasNext()) {
+ if (section != null) {
+ log.info("Generated {} record(s) for the {} section of
snapshot {}.",
+ numRecords, section.name(), writer.epoch());
+ section = null;
+ numRecords = 0;
+ }
+ if (!sectionIterator.hasNext()) {
+ writer.completeSnapshot();
+ return -1;
+ }
+ section = sectionIterator.next();
+ log.info("Generating records for the {} section of snapshot
{}.",
+ section.name(), writer.epoch());
+ batchIterator = section.iterator();
+ }
+ batch = batchIterator.next();
+ }
+ if (writer.writeBatch(batch)) {
+ numRecords += batch.size();
+ numWriteTries = 0;
+ batch = null;
+ return 0;
+ } else {
+ return ++numWriteTries;
+ }
+ }
+
+ /**
+ * Generate the next few batches of records.
+ *
+ * @return The number of nanoseconds to delay before rescheduling the
+ * generateBatches event, or empty if the snapshot is done.
+ */
+ OptionalLong generateBatches() throws Exception {
+ for (int numBatches = 0; numBatches < maxBatchesPerGenerateCall;
numBatches++) {
+ long result = generateBatch();
+ if (result < 0) {
+ return OptionalLong.empty();
+ } else if (result > 0) {
+ return
OptionalLong.of(exponentialBackoff.backoff(numWriteTries - 1));
Review comment:
Should we use `result` here instead of `numWriteTries`? If not, maybe we
can change generateBatch() to return a boolean instead
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