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Posted to jira@kafka.apache.org by GitBox <gi...@apache.org> on 2022/12/08 15:11:15 UTC
[GitHub] [kafka] mumrah commented on a diff in pull request #12964: MINOR: Introduce MetadataProvenance and ImageReWriter
mumrah commented on code in PR #12964:
URL: https://github.com/apache/kafka/pull/12964#discussion_r1043452505
##########
metadata/src/main/java/org/apache/kafka/image/MetadataProvenance.java:
##########
@@ -0,0 +1,89 @@
+/*
+ * 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.image;
+
+import org.apache.kafka.raft.OffsetAndEpoch;
+
+import java.util.Objects;
+
+
+/**
+ * Information about the source of a metadata image.
+ */
+public final class MetadataProvenance {
+ public static final MetadataProvenance EMPTY = new MetadataProvenance(-1L, 0, 0L);
+
+ private final long offset;
+ private final int epoch;
+ private final long lastContainedLogTimeMs;
+
+ public MetadataProvenance(
+ long offset,
+ int epoch,
+ long lastContainedLogTimeMs
+ ) {
+ this.offset = offset;
+ this.epoch = epoch;
+ this.lastContainedLogTimeMs = lastContainedLogTimeMs;
+ }
+
+ public OffsetAndEpoch offsetAndEpoch() {
+ return new OffsetAndEpoch(offset, epoch);
+ }
+
+ public long offset() {
+ return offset;
+ }
+
+ public int epoch() {
+ return epoch;
+ }
+
+ public long lastContainedLogTimeMs() {
+ return lastContainedLogTimeMs;
+ }
+
+ public String snapshotName() {
Review Comment:
Is this used anywhere? Is it meant to match the name of the snapshot file?
##########
metadata/src/main/java/org/apache/kafka/image/MetadataVersionChange.java:
##########
@@ -0,0 +1,69 @@
+/*
+ * 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.image;
+
+import org.apache.kafka.server.common.MetadataVersion;
+
+import java.util.Objects;
+
+
+/**
+ * A change in the MetadataVersion.
+ */
+public final class MetadataVersionChange {
Review Comment:
Would it be useful to have methods like "isUpgrade" or "isDowngrade" here?
##########
metadata/src/main/java/org/apache/kafka/image/MetadataProvenance.java:
##########
@@ -0,0 +1,89 @@
+/*
+ * 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.image;
+
+import org.apache.kafka.raft.OffsetAndEpoch;
+
+import java.util.Objects;
+
+
+/**
+ * Information about the source of a metadata image.
+ */
+public final class MetadataProvenance {
+ public static final MetadataProvenance EMPTY = new MetadataProvenance(-1L, 0, 0L);
Review Comment:
We should probably make these sentinels the same as the initial values used in BrokerMetadataListener. That way, if someone read `provenance()` off the listener before we processed anything, it would equal EMPTY
##########
metadata/src/main/java/org/apache/kafka/image/MetadataDelta.java:
##########
@@ -152,19 +153,7 @@ public Optional<MetadataVersion> metadataVersionChanged() {
}
}
- public void read(long highestOffset, int highestEpoch, Iterator<List<ApiMessageAndVersion>> reader) {
- while (reader.hasNext()) {
- List<ApiMessageAndVersion> batch = reader.next();
- for (ApiMessageAndVersion messageAndVersion : batch) {
- replay(highestOffset, highestEpoch, messageAndVersion.message());
- }
- }
- }
-
- public void replay(long offset, int epoch, ApiMessage record) {
- highestOffset = offset;
- highestEpoch = epoch;
-
+ public void replay(ApiMessage record) {
Review Comment:
A side effect of this is that we won't know what offset a Delta includes until we apply it. Are there any cases where that might be an issue?
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