package org.apache.hadoop.hbase.ipc;
/**
* 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.
*/
import java.nio.channels.ClosedChannelException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.hbase.CellScanner;
import org.apache.hadoop.hbase.ipc.RpcServer.Call;
import org.apache.hadoop.hbase.monitoring.MonitoredRPCHandler;
import org.apache.hadoop.hbase.monitoring.TaskMonitor;
import org.apache.hadoop.hbase.security.UserProvider;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.StringUtils;
import org.cloudera.htrace.Trace;
import org.cloudera.htrace.TraceScope;
import com.google.protobuf.Message;
/**
* The request processing logic, which is usually executed in thread pools provided by an
* {@link RpcScheduler}. Call {@link #run()} to actually execute the contained
* {@link RpcServer.Call}
*/
@InterfaceAudience.Private
public class CallRunner {
private final Call call;
private final RpcServerInterface rpcServer;
private final MonitoredRPCHandler status;
private UserProvider userProvider;
/**
* On construction, adds the size of this call to the running count of outstanding call sizes.
* Presumption is that we are put on a queue while we wait on an executor to run us. During this
* time we occupy heap.
* @param call The call to run.
* @param rpcServer
*/
// The constructor is shutdown so only RpcServer in this class can make one of these.
CallRunner(final RpcServerInterface rpcServer, final Call call, UserProvider userProvider) {
this.call = call;
this.rpcServer = rpcServer;
// Add size of the call to queue size.
this.rpcServer.addCallSize(call.getSize());
this.status = getStatus();
this.userProvider = userProvider;
}
public Call getCall() {
return call;
}
public void run() {
try {
this.status.setStatus("Setting up call");
this.status.setConnection(call.connection.getHostAddress(), call.connection.getRemotePort());
if (RpcServer.LOG.isDebugEnabled()) {
UserGroupInformation remoteUser = call.connection.user;
RpcServer.LOG.debug(call.toShortString() + " executing as " +
((remoteUser == null) ? "NULL principal" : remoteUser.getUserName()));
}
Throwable errorThrowable = null;
String error = null;
Pair<Message, CellScanner> resultPair = null;
RpcServer.CurCall.set(call);
TraceScope traceScope = null;
try {
if (!this.rpcServer.isStarted()) {
throw new ServerNotRunningYetException("Server is not running yet");
}
if (call.tinfo != null) {
traceScope = Trace.startSpan(call.toTraceString(), call.tinfo);
}
RequestContext.set(userProvider.create(call.connection.user), RpcServer.getRemoteIp(),
call.connection.service);
// make the call
resultPair = this.rpcServer.call(call.service, call.md, call.param, call.cellScanner,
call.timestamp, this.status);
} catch (Throwable e) {
RpcServer.LOG.debug(Thread.currentThread().getName() + ": " + call.toShortString(), e);
errorThrowable = e;
error = StringUtils.stringifyException(e);
} finally {
if (traceScope != null) {
traceScope.close();
}
// Must always clear the request context to avoid leaking
// credentials between requests.
RequestContext.clear();
}
RpcServer.CurCall.set(null);
this.rpcServer.addCallSize(call.getSize() * -1);
// Set the response for undelayed calls and delayed calls with
// undelayed responses.
if (!call.isDelayed() || !call.isReturnValueDelayed()) {
Message param = resultPair != null ? resultPair.getFirst() : null;
CellScanner cells = resultPair != null ? resultPair.getSecond() : null;
call.setResponse(param, cells, errorThrowable, error);
}
call.sendResponseIfReady();
this.status.markComplete("Sent response");
this.status.pause("Waiting for a call");
} catch (OutOfMemoryError e) {
if (this.rpcServer.getErrorHandler() != null) {
if (this.rpcServer.getErrorHandler().checkOOME(e)) {
RpcServer.LOG.info(Thread.currentThread().getName() + ": exiting on OutOfMemoryError");
return;
}
} else {
// rethrow if no handler
throw e;
}
} catch (ClosedChannelException cce) {
RpcServer.LOG.warn(Thread.currentThread().getName() + ": caught a ClosedChannelException, " +
"this means that the server was processing a " +
"request but the client went away. The error message was: " +
cce.getMessage());
} catch (Exception e) {
RpcServer.LOG.warn(Thread.currentThread().getName()
+ ": caught: " + StringUtils.stringifyException(e));
}
}
MonitoredRPCHandler getStatus() {
// It is ugly the way we park status up in RpcServer. Let it be for now. TODO.
MonitoredRPCHandler status = RpcServer.MONITORED_RPC.get();
if (status != null) {
return status;
}
status = TaskMonitor.get().createRPCStatus(Thread.currentThread().getName());
status.pause("Waiting for a call");
RpcServer.MONITORED_RPC.set(status);
return status;
}
}