| /* |
| * 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.cassandra.db.virtual; |
| |
| import java.util.Collections; |
| import java.util.Date; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import ch.qos.logback.classic.spi.LoggingEvent; |
| import org.apache.cassandra.config.CassandraRelevantProperties; |
| import org.apache.cassandra.db.DecoratedKey; |
| import org.apache.cassandra.db.marshal.Int32Type; |
| import org.apache.cassandra.db.marshal.TimestampType; |
| import org.apache.cassandra.db.marshal.UTF8Type; |
| import org.apache.cassandra.dht.LocalPartitioner; |
| import org.apache.cassandra.schema.TableMetadata; |
| |
| /** |
| * Virtual table for holding Cassandra logs. Entries to this table are added via log appender. |
| * <p> |
| * The virtual table is bounded in its size. If a new log message is appended to virtual table, |
| * the oldest one is removed. |
| * <p> |
| * This virtual table can be truncated. |
| * <p> |
| * This table does not enable {@code ALLOW FILTERING} implicitly. |
| * |
| * @see <a href="https://issues.apache.org/jira/browse/CASSANDRA-18238">CASSANDRA-18238</a> |
| * @see org.apache.cassandra.utils.logging.VirtualTableAppender |
| */ |
| public final class LogMessagesTable extends AbstractMutableVirtualTable |
| { |
| private static final Logger logger = LoggerFactory.getLogger(LogMessagesTable.class); |
| |
| public static final int LOGS_VIRTUAL_TABLE_MIN_ROWS = 1000; |
| public static final int LOGS_VIRTUAL_TABLE_DEFAULT_ROWS = 50_000; |
| public static final int LOGS_VIRTUAL_TABLE_MAX_ROWS = 100_000; |
| |
| public static final String TABLE_NAME = "system_logs"; |
| private static final String TABLE_COMMENT = "Cassandra logs"; |
| |
| public static final String TIMESTAMP_COLUMN_NAME = "timestamp"; |
| public static final String LOGGER_COLUMN_NAME = "logger"; |
| public static final String ORDER_IN_MILLISECOND_COLUMN_NAME = "order_in_millisecond"; |
| public static final String LEVEL_COLUMN_NAME = "level"; |
| public static final String MESSAGE_COLUMN_NAME = "message"; |
| |
| private final List<LogMessage> buffer; |
| |
| LogMessagesTable(String keyspace) |
| { |
| this(keyspace, resolveBufferSize()); |
| } |
| |
| @VisibleForTesting |
| LogMessagesTable(String keyspace, int size) |
| { |
| super(TableMetadata.builder(keyspace, TABLE_NAME) |
| .comment(TABLE_COMMENT) |
| .kind(TableMetadata.Kind.VIRTUAL) |
| .partitioner(new LocalPartitioner(TimestampType.instance)) |
| .addPartitionKeyColumn(TIMESTAMP_COLUMN_NAME, TimestampType.instance) |
| .addClusteringColumn(ORDER_IN_MILLISECOND_COLUMN_NAME, Int32Type.instance) |
| .addRegularColumn(LOGGER_COLUMN_NAME, UTF8Type.instance) |
| .addRegularColumn(LEVEL_COLUMN_NAME, UTF8Type.instance) |
| .addRegularColumn(MESSAGE_COLUMN_NAME, UTF8Type.instance).build()); |
| |
| logger.debug("capacity of virtual table {} is set to be at most {} rows", metadata().toString(), size); |
| buffer = BoundedLinkedList.create(size); |
| } |
| |
| @Override |
| public DataSet data() |
| { |
| SimpleDataSet result = new SimpleDataSet(metadata(), DecoratedKey.comparator.reversed()); |
| |
| synchronized (buffer) |
| { |
| long milliSecondsOfPreviousLog = 0; |
| long milliSecondsOfCurrentLog; |
| |
| int index = 0; |
| |
| Iterator<LogMessage> iterator = buffer.listIterator(); |
| while (iterator.hasNext()) |
| { |
| LogMessage log = iterator.next(); |
| |
| milliSecondsOfCurrentLog = log.timestamp; |
| if (milliSecondsOfPreviousLog == milliSecondsOfCurrentLog) |
| ++index; |
| else |
| index = 0; |
| |
| milliSecondsOfPreviousLog = milliSecondsOfCurrentLog; |
| |
| result.row(new Date(log.timestamp), index) |
| .column(LOGGER_COLUMN_NAME, log.logger) |
| .column(LEVEL_COLUMN_NAME, log.level) |
| .column(MESSAGE_COLUMN_NAME, log.message); |
| } |
| } |
| |
| return result; |
| } |
| |
| public void add(LoggingEvent event) |
| { |
| buffer.add(new LogMessage(event)); |
| } |
| |
| @Override |
| public void truncate() |
| { |
| buffer.clear(); |
| } |
| |
| @Override |
| public boolean allowFilteringImplicitly() |
| { |
| return false; |
| } |
| |
| @VisibleForTesting |
| static int resolveBufferSize() |
| { |
| int size = CassandraRelevantProperties.LOGS_VIRTUAL_TABLE_MAX_ROWS.getInt(); |
| return (size < LOGS_VIRTUAL_TABLE_MIN_ROWS || size > LOGS_VIRTUAL_TABLE_MAX_ROWS) |
| ? LOGS_VIRTUAL_TABLE_DEFAULT_ROWS : size; |
| } |
| |
| @VisibleForTesting |
| public static class LogMessage |
| { |
| public final long timestamp; |
| public final String logger; |
| public final String level; |
| public final String message; |
| |
| public LogMessage(LoggingEvent event) |
| { |
| this(event.getTimeStamp(), event.getLoggerName(), event.getLevel().toString(), event.getFormattedMessage()); |
| } |
| |
| public LogMessage(long timestamp, String logger, String level, String message) |
| { |
| this.timestamp = timestamp; |
| this.logger = logger; |
| this.level = level; |
| this.message = message; |
| } |
| } |
| |
| private static final class BoundedLinkedList<T> extends LinkedList<T> |
| { |
| private final int maxSize; |
| |
| public static <T> List<T> create(int size) |
| { |
| return Collections.synchronizedList(new BoundedLinkedList<>(size)); |
| } |
| |
| private BoundedLinkedList(int maxSize) |
| { |
| this.maxSize = maxSize; |
| } |
| |
| @Override |
| public boolean add(T t) |
| { |
| if (size() == maxSize) |
| removeLast(); |
| |
| addFirst(t); |
| |
| return true; |
| } |
| } |
| } |