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Main functionality for HBase
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.net.InetSocketAddress;
import java.nio.channels.ClosedChannelException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.CallDroppedException;
import org.apache.hadoop.hbase.CellScanner;
import org.apache.hadoop.hbase.HBaseInterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceAudience;
import org.apache.hadoop.hbase.classification.InterfaceStability;
import org.apache.hadoop.hbase.ipc.RpcServer.Call;
import org.apache.hadoop.hbase.monitoring.MonitoredRPCHandler;
import org.apache.hadoop.hbase.util.Pair;
import org.apache.hadoop.security.UserGroupInformation;
import org.apache.hadoop.util.StringUtils;
import org.apache.htrace.Trace;
import org.apache.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
* RpcServer.Call
*/
@InterfaceAudience.LimitedPrivate({HBaseInterfaceAudience.COPROC, HBaseInterfaceAudience.PHOENIX})
@InterfaceStability.Evolving
public class CallRunner {
private static final Log LOG = LogFactory.getLog(CallRunner.class);
private static final CallDroppedException CALL_DROPPED_EXCEPTION
= new CallDroppedException();
private Call call;
private RpcServerInterface rpcServer;
private MonitoredRPCHandler status;
private volatile boolean sucessful;
/**
* 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.
*/
// The constructor is shutdown so only RpcServer in this class can make one of these.
CallRunner(final RpcServerInterface rpcServer, final Call call) {
this.call = call;
this.rpcServer = rpcServer;
// Add size of the call to queue size.
if (call != null && rpcServer != null) {
this.rpcServer.addCallSize(call.getSize());
}
}
public Call getCall() {
return call;
}
public void setStatus(MonitoredRPCHandler status) {
this.status = status;
}
/**
* Cleanup after ourselves... let go of references.
*/
private void cleanup() {
this.call = null;
this.rpcServer = null;
}
public void run() {
try {
if (!call.connection.channel.isOpen()) {
if (RpcServer.LOG.isDebugEnabled()) {
RpcServer.LOG.debug(Thread.currentThread().getName() + ": skipped " + call);
}
return;
}
call.startTime = System.currentTimeMillis();
if (call.startTime > call.deadline) {
RpcServer.LOG.info("Drop timeout call: " + call);
return;
}
this.status.setStatus("Setting up call");
this.status.setConnection(call.connection.getHostAddress(), call.connection.getRemotePort());
if (RpcServer.LOG.isTraceEnabled()) {
UserGroupInformation remoteUser = call.connection.ugi;
RpcServer.LOG.trace(call.toShortString() + " executing as " +
((remoteUser == null) ? "NULL principal" : remoteUser.getUserName()));
}
Throwable errorThrowable = null;
String error = null;
Pair resultPair = null;
RpcServer.CurCall.set(call);
TraceScope traceScope = null;
try {
if (!this.rpcServer.isStarted()) {
InetSocketAddress address = rpcServer.getListenerAddress();
throw new ServerNotRunningYetException("Server " +
(address != null ? address : "(channel closed)") + " is not running yet");
}
if (call.tinfo != null) {
traceScope = Trace.startSpan(call.toTraceString(), call.tinfo);
}
// make the call
resultPair = this.rpcServer.call(call.service, call.md, call.param, call.cellScanner,
call.timestamp, this.status, call.startTime, call.timeout);
} catch (Throwable e) {
RpcServer.LOG.debug(Thread.currentThread().getName() + ": " + call.toShortString(), e);
errorThrowable = e;
error = StringUtils.stringifyException(e);
if (e instanceof Error) {
throw (Error)e;
}
} finally {
if (traceScope != null) {
traceScope.close();
}
RpcServer.CurCall.set(null);
if (resultPair != null) {
this.rpcServer.addCallSize(call.getSize() * -1);
sucessful = true;
}
}
// Set the response
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) {
InetSocketAddress address = rpcServer.getListenerAddress();
RpcServer.LOG.warn(Thread.currentThread().getName() + ": caught a ClosedChannelException, " +
"this means that the server " + (address != null ? address : "(channel closed)") +
" 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));
} finally {
if (!sucessful) {
this.rpcServer.addCallSize(call.getSize() * -1);
}
cleanup();
}
}
/**
* When we want to drop this call because of server is overloaded.
*/
public void drop() {
try {
if (!call.connection.channel.isOpen()) {
if (RpcServer.LOG.isDebugEnabled()) {
RpcServer.LOG.debug(Thread.currentThread().getName() + ": skipped " + call);
}
return;
}
// Set the response
InetSocketAddress address = rpcServer.getListenerAddress();
call.setResponse(null, null, CALL_DROPPED_EXCEPTION, "Call dropped, server "
+ (address != null ? address : "(channel closed)") + " is overloaded, please retry.");
call.sendResponseIfReady();
} catch (ClosedChannelException cce) {
InetSocketAddress address = rpcServer.getListenerAddress();
RpcServer.LOG.warn(Thread.currentThread().getName() + ": caught a ClosedChannelException, " +
"this means that the server " + (address != null ? address : "(channel closed)") +
" 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));
} finally {
if (!sucessful) {
this.rpcServer.addCallSize(call.getSize() * -1);
}
cleanup();
}
}
}