| /* |
| * 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.tracing; |
| |
| import java.net.InetAddress; |
| import java.util.Collections; |
| import java.util.UUID; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.cassandra.concurrent.Stage; |
| import org.apache.cassandra.concurrent.StageManager; |
| import org.apache.cassandra.db.ConsistencyLevel; |
| import org.apache.cassandra.db.Mutation; |
| import org.apache.cassandra.exceptions.OverloadedException; |
| import org.apache.cassandra.service.StorageProxy; |
| import org.apache.cassandra.utils.JVMStabilityInspector; |
| import org.apache.cassandra.utils.WrappedRunnable; |
| |
| /** |
| * ThreadLocal state for a tracing session. The presence of an instance of this class as a ThreadLocal denotes that an |
| * operation is being traced. |
| */ |
| public class TraceStateImpl extends TraceState |
| { |
| private static final Logger logger = LoggerFactory.getLogger(TraceStateImpl.class); |
| private static final int WAIT_FOR_PENDING_EVENTS_TIMEOUT_SECS = |
| Integer.valueOf(System.getProperty("cassandra.wait_for_tracing_events_timeout_secs", "1")); |
| |
| public TraceStateImpl(InetAddress coordinator, UUID sessionId, Tracing.TraceType traceType) |
| { |
| super(coordinator, sessionId, traceType); |
| } |
| |
| protected void traceImpl(String message) |
| { |
| final String threadName = Thread.currentThread().getName(); |
| final int elapsed = elapsed(); |
| |
| executeMutation(TraceKeyspace.makeEventMutation(sessionIdBytes, message, elapsed, threadName, ttl)); |
| if (logger.isTraceEnabled()) |
| logger.trace("Adding <{}> to trace events", message); |
| } |
| |
| /** |
| * Post a no-op event to the TRACING stage, so that we can be sure that any previous mutations |
| * have at least been applied to one replica. This works because the tracking executor only |
| * has one thread in its pool, see {@link StageManager#tracingExecutor()}. |
| */ |
| protected void waitForPendingEvents() |
| { |
| if (WAIT_FOR_PENDING_EVENTS_TIMEOUT_SECS <= 0) |
| return; |
| |
| try |
| { |
| if (logger.isTraceEnabled()) |
| logger.trace("Waiting for up to {} seconds for trace events to complete", |
| WAIT_FOR_PENDING_EVENTS_TIMEOUT_SECS); |
| |
| StageManager.getStage(Stage.TRACING).submit(StageManager.NO_OP_TASK) |
| .get(WAIT_FOR_PENDING_EVENTS_TIMEOUT_SECS, TimeUnit.SECONDS); |
| } |
| catch (Throwable t) |
| { |
| JVMStabilityInspector.inspectThrowable(t); |
| logger.debug("Failed to wait for tracing events to complete: {}", t); |
| } |
| } |
| |
| static void executeMutation(final Mutation mutation) |
| { |
| StageManager.getStage(Stage.TRACING).execute(new WrappedRunnable() |
| { |
| protected void runMayThrow() |
| { |
| mutateWithCatch(mutation); |
| } |
| }); |
| } |
| |
| static void mutateWithCatch(Mutation mutation) |
| { |
| try |
| { |
| StorageProxy.mutate(Collections.singletonList(mutation), ConsistencyLevel.ANY); |
| } |
| catch (OverloadedException e) |
| { |
| Tracing.logger.warn("Too many nodes are overloaded to save trace events"); |
| } |
| } |
| |
| } |