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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.Set;
import java.util.UUID;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
import com.google.common.annotations.VisibleForTesting;
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);
@VisibleForTesting
public static int WAIT_FOR_PENDING_EVENTS_TIMEOUT_SECS =
Integer.parseInt(System.getProperty("cassandra.wait_for_tracing_events_timeout_secs", "0"));
private final Set> pendingFutures = ConcurrentHashMap.newKeySet();
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);
}
/**
* Wait on submitted futures
*/
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, pendingFutures.size());
CompletableFuture.allOf(pendingFutures.toArray(new CompletableFuture[pendingFutures.size()]))
.get(WAIT_FOR_PENDING_EVENTS_TIMEOUT_SECS, TimeUnit.SECONDS);
}
catch (TimeoutException ex)
{
if (logger.isTraceEnabled())
logger.trace("Failed to wait for tracing events to complete in {} seconds",
WAIT_FOR_PENDING_EVENTS_TIMEOUT_SECS);
}
catch (Throwable t)
{
JVMStabilityInspector.inspectThrowable(t);
logger.error("Got exception whilst waiting for tracing events to complete", t);
}
}
void executeMutation(final Mutation mutation)
{
CompletableFuture fut = CompletableFuture.runAsync(new WrappedRunnable()
{
protected void runMayThrow()
{
mutateWithCatch(mutation);
}
}, StageManager.getStage(Stage.TRACING));
boolean ret = pendingFutures.add(fut);
if (!ret)
logger.warn("Failed to insert pending future, tracing synchronization may not work");
}
static void mutateWithCatch(Mutation mutation)
{
try
{
StorageProxy.mutate(Collections.singletonList(mutation), ConsistencyLevel.ANY, System.nanoTime());
}
catch (OverloadedException e)
{
Tracing.logger.warn("Too many nodes are overloaded to save trace events");
}
}
}