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Posted to jira@kafka.apache.org by GitBox <gi...@apache.org> on 2022/12/23 11:06:58 UTC
[GitHub] [kafka] fvaleri commented on a diff in pull request #13041: KAFKA-14549: Move LogDirFailureChannel to storage module
fvaleri commented on code in PR #13041:
URL: https://github.com/apache/kafka/pull/13041#discussion_r1056252248
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storage/src/main/java/org/apache/kafka/server/log/internals/LogDirFailureChannel.java:
##########
@@ -0,0 +1,80 @@
+/*
+ * 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.server.log.internals;
+
+import java.io.IOException;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/*
+ * LogDirFailureChannel allows an external thread to block waiting for new offline log dirs.
+ *
+ * There should be a single instance of LogDirFailureChannel accessible by any class that does disk-IO operation.
+ * If IOException is encountered while accessing a log directory, the corresponding class can add the log directory name
+ * to the LogDirFailureChannel using maybeAddOfflineLogDir(). Each log directory will be added only once. After a log
+ * directory is added for the first time, a thread which is blocked waiting for new offline log directories
+ * can take the name of the new offline log directory out of the LogDirFailureChannel and handle the log failure properly.
+ * An offline log directory will stay offline until the broker is restarted.
+ */
+public class LogDirFailureChannel {
+ private static final Logger log = LoggerFactory.getLogger(LogDirFailureChannel.class);
+ private final ConcurrentMap<String, String> offlineLogDirs;
+ private final BlockingQueue<String> offlineLogDirQueue;
+
+ public LogDirFailureChannel(int logDirNum) {
+ this.offlineLogDirs = new ConcurrentHashMap<>();
+ this.offlineLogDirQueue = new ArrayBlockingQueue<>(logDirNum);
+ }
+
+ public boolean hasOfflineLogDir(String logDir) {
+ return offlineLogDirs.containsKey(logDir);
+ }
+
+ /**
+ * If the given logDir is not already offline, add it to the
+ * set of offline log dirs and enqueue it to the logDirFailureEvent queue.
+ *
+ * @param logDir The offline logDir.
+ * @param msg Error message.
+ * @param e Exception instance.
+ */
+ public void maybeAddOfflineLogDir(String logDir, String msg, IOException e) {
Review Comment:
Agree. I think that the additional complexity is not justified here.
##########
storage/src/main/java/org/apache/kafka/server/log/internals/LogDirFailureChannel.java:
##########
@@ -0,0 +1,80 @@
+/*
+ * 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.server.log.internals;
+
+import java.io.IOException;
+import java.util.concurrent.ArrayBlockingQueue;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/*
+ * LogDirFailureChannel allows an external thread to block waiting for new offline log dirs.
+ *
+ * There should be a single instance of LogDirFailureChannel accessible by any class that does disk-IO operation.
+ * If IOException is encountered while accessing a log directory, the corresponding class can add the log directory name
+ * to the LogDirFailureChannel using maybeAddOfflineLogDir(). Each log directory will be added only once. After a log
+ * directory is added for the first time, a thread which is blocked waiting for new offline log directories
+ * can take the name of the new offline log directory out of the LogDirFailureChannel and handle the log failure properly.
+ * An offline log directory will stay offline until the broker is restarted.
+ */
+public class LogDirFailureChannel {
+ private static final Logger log = LoggerFactory.getLogger(LogDirFailureChannel.class);
+ private final ConcurrentMap<String, String> offlineLogDirs;
+ private final BlockingQueue<String> offlineLogDirQueue;
+
+ public LogDirFailureChannel(int logDirNum) {
+ this.offlineLogDirs = new ConcurrentHashMap<>();
+ this.offlineLogDirQueue = new ArrayBlockingQueue<>(logDirNum);
+ }
+
+ public boolean hasOfflineLogDir(String logDir) {
+ return offlineLogDirs.containsKey(logDir);
+ }
+
+ /**
+ * If the given logDir is not already offline, add it to the
+ * set of offline log dirs and enqueue it to the logDirFailureEvent queue.
+ *
+ * @param logDir The offline logDir.
+ * @param msg Error message.
+ * @param e Exception instance.
+ */
+ public void maybeAddOfflineLogDir(String logDir, String msg, IOException e) {
+ log.error(msg, e);
+ if (offlineLogDirs.putIfAbsent(logDir, logDir) == null) {
+ offlineLogDirQueue.add(logDir);
+ }
+ }
+
+ /**
+ * Get the next offline log dir from logDirFailureEvent queue.
+ * The method will wait if necessary until a new offline log directory becomes available
+ *
+ * @return The next offline log dir.
+ */
+ public String takeNextOfflineLogDir() {
+ try {
+ return offlineLogDirQueue.take();
+ } catch (InterruptedException e) {
+ throw new RuntimeException(e);
Review Comment:
Agree, we don't need to reconsider ex handling now and there is a single Scala caller.
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