ndimiduk commented on code in PR #4340: URL: https://github.com/apache/hbase/pull/4340#discussion_r848769758
########## hbase-logging/src/test/java/org/apache/hadoop/hbase/logging/HBaseTestAppender.java: ########## @@ -0,0 +1,166 @@ +/* + * 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.hadoop.hbase.logging; + +import java.io.Serializable; +import java.nio.charset.StandardCharsets; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicLong; +import org.apache.logging.log4j.core.Appender; +import org.apache.logging.log4j.core.Core; +import org.apache.logging.log4j.core.Filter; +import org.apache.logging.log4j.core.Layout; +import org.apache.logging.log4j.core.LogEvent; +import org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender; +import org.apache.logging.log4j.core.appender.ManagerFactory; +import org.apache.logging.log4j.core.appender.OutputStreamManager; +import org.apache.logging.log4j.core.appender.rolling.FileSize; +import org.apache.logging.log4j.core.config.Property; +import org.apache.logging.log4j.core.config.plugins.Plugin; +import org.apache.logging.log4j.core.config.plugins.PluginBuilderAttribute; +import org.apache.logging.log4j.core.config.plugins.PluginBuilderFactory; +import org.apache.logging.log4j.core.config.plugins.validation.constraints.Required; + +/** + * Log4j2 appender to be used when running UTs. + * <p/> + * The main point here is to limit the total output size to prevent eating all the space of our ci + * system when something wrong in our code. + * <p/> + * See HBASE-26947 for more details. + */ +@Plugin(name = HBaseTestAppender.PLUGIN_NAME, category = Core.CATEGORY_NAME, + elementType = Appender.ELEMENT_TYPE, printObject = true) +public final class HBaseTestAppender extends AbstractOutputStreamAppender<OutputStreamManager> { + + public static final String PLUGIN_NAME = "HBaseTest"; + private static final HBaseTestManagerFactory FACTORY = new HBaseTestManagerFactory(); + + public static class Builder<B extends Builder<B>> extends AbstractOutputStreamAppender.Builder<B> + implements org.apache.logging.log4j.core.util.Builder<HBaseTestAppender> { + + @PluginBuilderAttribute + @Required + private Target target; + + @PluginBuilderAttribute + @Required + private String maxSize; + + public B setTarget(Target target) { + this.target = target; + return asBuilder(); + } + + public B setMaxSize(String maxSize) { + this.maxSize = maxSize; + return asBuilder(); + } + + @Override + public HBaseTestAppender build() { + long size = FileSize.parse(maxSize, -1); + if (size <= 0) { + LOGGER.error("Invalid maxSize {}", size); + } + Layout<? extends Serializable> layout = getOrCreateLayout(StandardCharsets.UTF_8); + OutputStreamManager manager = + OutputStreamManager.getManager(target.name(), FACTORY, new FactoryData(target, layout)); + return new HBaseTestAppender(getName(), + layout, + getFilter(), + isIgnoreExceptions(), + isImmediateFlush(), + getPropertyArray(), + manager, + size); + } + } + + /** + * Data to pass to factory method.Unable to instantiate + */ + private static class FactoryData { + private final Target target; + private final Layout<? extends Serializable> layout; + + public FactoryData(Target target, Layout<? extends Serializable> layout) { + this.target = target; + this.layout = layout; + } + } + + /** + * Factory to create the Appender. + */ + private static class HBaseTestManagerFactory + implements ManagerFactory<HBaseTestOutputStreamManager, FactoryData> { + + /** + * Create an OutputStreamManager. + * @param name The name of the entity to manage. + * @param data The data required to create the entity. + * @return The OutputStreamManager + */ + @Override + public HBaseTestOutputStreamManager createManager(final String name, final FactoryData data) { + return new HBaseTestOutputStreamManager(data.target, data.layout); + } + } + + @PluginBuilderFactory + public static <B extends Builder<B>> B newBuilder() { + return new Builder<B>().asBuilder(); + } + + private final long maxSize; + + private final AtomicLong size = new AtomicLong(0); + + private final AtomicBoolean stop = new AtomicBoolean(false); + + private HBaseTestAppender(String name, Layout<? extends Serializable> layout, Filter filter, + boolean ignoreExceptions, boolean immediateFlush, Property[] properties, + OutputStreamManager manager, long maxSize) { + super(name, layout, filter, ignoreExceptions, immediateFlush, properties, manager); + this.maxSize = maxSize; + } + + @Override + public void append(LogEvent event) { + if (stop.get()) { + return; + } + // for accounting, here we always convert the event to byte array first + // this will effect performance a bit but it is OK since this is for UT only + byte[] bytes = getLayout().toByteArray(event); + if (bytes == null || bytes.length == 0) { + return; + } + long sizeAfterAppend = size.addAndGet(bytes.length); + if (sizeAfterAppend >= maxSize) { + // stop logging if the log size exceeded the limit + if (stop.compareAndSet(false, true)) { + LOGGER.error("Log size exceeded the limit {}, will stop logging to prevent eating" + + " too much disk space", maxSize); + } + return; + } + super.append(event); + } +} Review Comment: I've done this in another logging framework but not log4j2. This is appending events to a single log line, building it up, is that correct? I think it's fine if we truncate log lines at a certain length, no need to error or whatever, just terminate the message. I'm a little surprised that this not available to use as a configuration option. In fact, the pattern layout does support it. https://stackoverflow.com/questions/27502536/limit-max-message-size-in-log4j2-pattern -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
