HADOOP-13465. Design Server.Call to be extensible for unified call queue. Contributed by Daryn Sharp.
This commit is contained in:
Kihwal Lee
parent
3069df7551
commit
76cd81f4b6
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@ -354,10 +354,9 @@ public abstract class Server {
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*/
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public static InetAddress getRemoteIp() {
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Call call = CurCall.get();
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return (call != null && call.connection != null) ? call.connection
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.getHostInetAddress() : null;
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return (call != null ) ? call.getHostInetAddress() : null;
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}
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/**
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* Returns the clientId from the current RPC request
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*/
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@ -380,10 +379,9 @@ public abstract class Server {
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*/
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public static UserGroupInformation getRemoteUser() {
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Call call = CurCall.get();
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return (call != null && call.connection != null) ? call.connection.user
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: null;
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return (call != null) ? call.getRemoteUser() : null;
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}
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/** Return true if the invocation was through an RPC.
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*/
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public static boolean isRpcInvocation() {
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@ -483,7 +481,7 @@ public abstract class Server {
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if ((rpcMetrics.getProcessingSampleCount() > minSampleSize) &&
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(processingTime > threeSigma)) {
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if(LOG.isWarnEnabled()) {
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String client = CurCall.get().connection.toString();
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String client = CurCall.get().toString();
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LOG.warn(
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"Slow RPC : " + methodName + " took " + processingTime +
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" milliseconds to process from client " + client);
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@ -657,62 +655,65 @@ public abstract class Server {
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CommonConfigurationKeys.IPC_BACKOFF_ENABLE_DEFAULT);
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}
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/** A call queued for handling. */
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public static class Call implements Schedulable {
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private final int callId; // the client's call id
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private final int retryCount; // the retry count of the call
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private final Writable rpcRequest; // Serialized Rpc request from client
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private final Connection connection; // connection to client
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private long timestamp; // time received when response is null
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// time served when response is not null
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private ByteBuffer rpcResponse; // the response for this call
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/** A generic call queued for handling. */
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public static class Call implements Schedulable,
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PrivilegedExceptionAction<Void> {
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final int callId; // the client's call id
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final int retryCount; // the retry count of the call
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long timestamp; // time received when response is null
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// time served when response is not null
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private AtomicInteger responseWaitCount = new AtomicInteger(1);
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private final RPC.RpcKind rpcKind;
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private final byte[] clientId;
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final RPC.RpcKind rpcKind;
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final byte[] clientId;
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private final TraceScope traceScope; // the HTrace scope on the server side
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private final CallerContext callerContext; // the call context
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private int priorityLevel;
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// the priority level assigned by scheduler, 0 by default
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private Call(Call call) {
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this(call.callId, call.retryCount, call.rpcRequest, call.connection,
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call.rpcKind, call.clientId, call.traceScope, call.callerContext);
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Call(Call call) {
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this(call.callId, call.retryCount, call.rpcKind, call.clientId,
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call.traceScope, call.callerContext);
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}
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public Call(int id, int retryCount, Writable param,
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Connection connection) {
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this(id, retryCount, param, connection, RPC.RpcKind.RPC_BUILTIN,
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RpcConstants.DUMMY_CLIENT_ID);
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Call(int id, int retryCount, RPC.RpcKind kind, byte[] clientId) {
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this(id, retryCount, kind, clientId, null, null);
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}
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public Call(int id, int retryCount, Writable param, Connection connection,
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@VisibleForTesting // primarily TestNamenodeRetryCache
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public Call(int id, int retryCount, Void ignore1, Void ignore2,
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RPC.RpcKind kind, byte[] clientId) {
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this(id, retryCount, param, connection, kind, clientId, null, null);
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this(id, retryCount, kind, clientId, null, null);
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}
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public Call(int id, int retryCount, Writable param, Connection connection,
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RPC.RpcKind kind, byte[] clientId, TraceScope traceScope,
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CallerContext callerContext) {
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Call(int id, int retryCount, RPC.RpcKind kind, byte[] clientId,
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TraceScope traceScope, CallerContext callerContext) {
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this.callId = id;
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this.retryCount = retryCount;
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this.rpcRequest = param;
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this.connection = connection;
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this.timestamp = Time.now();
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this.rpcResponse = null;
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this.rpcKind = kind;
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this.clientId = clientId;
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this.traceScope = traceScope;
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this.callerContext = callerContext;
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}
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@Override
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public String toString() {
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return rpcRequest + " from " + connection + " Call#" + callId + " Retry#"
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+ retryCount;
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return "Call#" + callId + " Retry#" + retryCount;
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}
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public void setResponse(ByteBuffer response) {
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this.rpcResponse = response;
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public Void run() throws Exception {
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return null;
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}
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// should eventually be abstract but need to avoid breaking tests
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public UserGroupInformation getRemoteUser() {
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return null;
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}
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public InetAddress getHostInetAddress() {
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return null;
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}
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public String getHostAddress() {
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InetAddress addr = getHostInetAddress();
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return (addr != null) ? addr.getHostAddress() : null;
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}
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/**
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@ -724,34 +725,36 @@ public abstract class Server {
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*/
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@InterfaceStability.Unstable
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@InterfaceAudience.LimitedPrivate({"HDFS"})
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public void postponeResponse() {
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public final void postponeResponse() {
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int count = responseWaitCount.incrementAndGet();
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assert count > 0 : "response has already been sent";
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}
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@InterfaceStability.Unstable
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@InterfaceAudience.LimitedPrivate({"HDFS"})
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public void sendResponse() throws IOException {
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public final void sendResponse() throws IOException {
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int count = responseWaitCount.decrementAndGet();
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assert count >= 0 : "response has already been sent";
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if (count == 0) {
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connection.sendResponse(this);
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doResponse(null);
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}
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}
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@InterfaceStability.Unstable
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@InterfaceAudience.LimitedPrivate({"HDFS"})
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public void abortResponse(Throwable t) throws IOException {
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public final void abortResponse(Throwable t) throws IOException {
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// don't send response if the call was already sent or aborted.
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if (responseWaitCount.getAndSet(-1) > 0) {
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connection.abortResponse(this, t);
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doResponse(t);
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}
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}
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void doResponse(Throwable t) throws IOException {}
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// For Schedulable
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@Override
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public UserGroupInformation getUserGroupInformation() {
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return connection.user;
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return getRemoteUser();
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}
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@Override
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@ -764,6 +767,114 @@ public abstract class Server {
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}
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}
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/** A RPC extended call queued for handling. */
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private class RpcCall extends Call {
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final Connection connection; // connection to client
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final Writable rpcRequest; // Serialized Rpc request from client
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ByteBuffer rpcResponse; // the response for this call
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RpcCall(RpcCall call) {
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super(call);
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this.connection = call.connection;
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this.rpcRequest = call.rpcRequest;
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}
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RpcCall(Connection connection, int id) {
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this(connection, id, RpcConstants.INVALID_RETRY_COUNT);
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}
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RpcCall(Connection connection, int id, int retryCount) {
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this(connection, id, retryCount, null,
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RPC.RpcKind.RPC_BUILTIN, RpcConstants.DUMMY_CLIENT_ID,
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null, null);
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}
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RpcCall(Connection connection, int id, int retryCount,
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Writable param, RPC.RpcKind kind, byte[] clientId,
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TraceScope traceScope, CallerContext context) {
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super(id, retryCount, kind, clientId, traceScope, context);
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this.connection = connection;
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this.rpcRequest = param;
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}
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@Override
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public UserGroupInformation getRemoteUser() {
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return connection.user;
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}
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@Override
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public InetAddress getHostInetAddress() {
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return connection.getHostInetAddress();
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}
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@Override
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public Void run() throws Exception {
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if (!connection.channel.isOpen()) {
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Server.LOG.info(Thread.currentThread().getName() + ": skipped " + this);
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return null;
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}
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String errorClass = null;
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String error = null;
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RpcStatusProto returnStatus = RpcStatusProto.SUCCESS;
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RpcErrorCodeProto detailedErr = null;
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Writable value = null;
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try {
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value = call(
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rpcKind, connection.protocolName, rpcRequest, timestamp);
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} catch (Throwable e) {
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if (e instanceof UndeclaredThrowableException) {
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e = e.getCause();
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}
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logException(Server.LOG, e, this);
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if (e instanceof RpcServerException) {
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RpcServerException rse = ((RpcServerException)e);
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returnStatus = rse.getRpcStatusProto();
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detailedErr = rse.getRpcErrorCodeProto();
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} else {
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returnStatus = RpcStatusProto.ERROR;
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detailedErr = RpcErrorCodeProto.ERROR_APPLICATION;
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}
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errorClass = e.getClass().getName();
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error = StringUtils.stringifyException(e);
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// Remove redundant error class name from the beginning of the
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// stack trace
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String exceptionHdr = errorClass + ": ";
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if (error.startsWith(exceptionHdr)) {
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error = error.substring(exceptionHdr.length());
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}
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}
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setupResponse(this, returnStatus, detailedErr,
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value, errorClass, error);
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sendResponse();
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return null;
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}
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void setResponse(ByteBuffer response) throws IOException {
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this.rpcResponse = response;
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}
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@Override
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void doResponse(Throwable t) throws IOException {
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RpcCall call = this;
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if (t != null) {
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// clone the call to prevent a race with another thread stomping
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// on the response while being sent. the original call is
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// effectively discarded since the wait count won't hit zero
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call = new RpcCall(this);
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setupResponse(call,
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RpcStatusProto.FATAL, RpcErrorCodeProto.ERROR_RPC_SERVER,
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null, t.getClass().getName(), StringUtils.stringifyException(t));
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}
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connection.sendResponse(call);
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}
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@Override
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public String toString() {
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return super.toString() + " " + rpcRequest + " from " + connection;
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}
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}
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/** Listens on the socket. Creates jobs for the handler threads*/
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private class Listener extends Thread {
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@ -1094,22 +1205,22 @@ public abstract class Server {
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if(LOG.isDebugEnabled()) {
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LOG.debug("Checking for old call responses.");
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}
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ArrayList<Call> calls;
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ArrayList<RpcCall> calls;
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// get the list of channels from list of keys.
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synchronized (writeSelector.keys()) {
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calls = new ArrayList<Call>(writeSelector.keys().size());
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calls = new ArrayList<RpcCall>(writeSelector.keys().size());
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iter = writeSelector.keys().iterator();
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while (iter.hasNext()) {
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SelectionKey key = iter.next();
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Call call = (Call)key.attachment();
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RpcCall call = (RpcCall)key.attachment();
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if (call != null && key.channel() == call.connection.channel) {
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calls.add(call);
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}
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}
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}
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for(Call call : calls) {
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for (RpcCall call : calls) {
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doPurge(call, now);
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}
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} catch (OutOfMemoryError e) {
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@ -1127,7 +1238,7 @@ public abstract class Server {
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}
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private void doAsyncWrite(SelectionKey key) throws IOException {
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Call call = (Call)key.attachment();
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RpcCall call = (RpcCall)key.attachment();
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if (call == null) {
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return;
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}
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@ -1155,10 +1266,10 @@ public abstract class Server {
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// Remove calls that have been pending in the responseQueue
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// for a long time.
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//
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private void doPurge(Call call, long now) {
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LinkedList<Call> responseQueue = call.connection.responseQueue;
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private void doPurge(RpcCall call, long now) {
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LinkedList<RpcCall> responseQueue = call.connection.responseQueue;
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synchronized (responseQueue) {
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Iterator<Call> iter = responseQueue.listIterator(0);
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Iterator<RpcCall> iter = responseQueue.listIterator(0);
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while (iter.hasNext()) {
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call = iter.next();
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if (now > call.timestamp + PURGE_INTERVAL) {
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@ -1172,12 +1283,12 @@ public abstract class Server {
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// Processes one response. Returns true if there are no more pending
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// data for this channel.
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//
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private boolean processResponse(LinkedList<Call> responseQueue,
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private boolean processResponse(LinkedList<RpcCall> responseQueue,
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boolean inHandler) throws IOException {
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boolean error = true;
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boolean done = false; // there is more data for this channel.
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int numElements = 0;
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Call call = null;
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RpcCall call = null;
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try {
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synchronized (responseQueue) {
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//
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@ -1260,7 +1371,7 @@ public abstract class Server {
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//
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// Enqueue a response from the application.
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//
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void doRespond(Call call) throws IOException {
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void doRespond(RpcCall call) throws IOException {
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synchronized (call.connection.responseQueue) {
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// must only wrap before adding to the responseQueue to prevent
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// postponed responses from being encrypted and sent out of order.
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@ -1358,7 +1469,7 @@ public abstract class Server {
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private SocketChannel channel;
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private ByteBuffer data;
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private ByteBuffer dataLengthBuffer;
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private LinkedList<Call> responseQueue;
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private LinkedList<RpcCall> responseQueue;
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// number of outstanding rpcs
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private AtomicInteger rpcCount = new AtomicInteger();
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private long lastContact;
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@ -1385,8 +1496,8 @@ public abstract class Server {
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public UserGroupInformation attemptingUser = null; // user name before auth
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// Fake 'call' for failed authorization response
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private final Call authFailedCall = new Call(AUTHORIZATION_FAILED_CALL_ID,
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RpcConstants.INVALID_RETRY_COUNT, null, this);
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private final RpcCall authFailedCall =
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new RpcCall(this, AUTHORIZATION_FAILED_CALL_ID);
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private boolean sentNegotiate = false;
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private boolean useWrap = false;
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@ -1409,7 +1520,7 @@ public abstract class Server {
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this.hostAddress = addr.getHostAddress();
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}
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this.remotePort = socket.getPort();
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this.responseQueue = new LinkedList<Call>();
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this.responseQueue = new LinkedList<RpcCall>();
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if (socketSendBufferSize != 0) {
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try {
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socket.setSendBufferSize(socketSendBufferSize);
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@ -1704,8 +1815,7 @@ public abstract class Server {
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}
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private void doSaslReply(Message message) throws IOException {
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final Call saslCall = new Call(AuthProtocol.SASL.callId,
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RpcConstants.INVALID_RETRY_COUNT, null, this);
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final RpcCall saslCall = new RpcCall(this, AuthProtocol.SASL.callId);
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setupResponse(saslCall,
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RpcStatusProto.SUCCESS, null,
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RpcWritable.wrap(message), null, null);
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@ -1922,23 +2032,20 @@ public abstract class Server {
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if (clientVersion >= 9) {
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// Versions >>9 understand the normal response
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Call fakeCall = new Call(-1, RpcConstants.INVALID_RETRY_COUNT, null,
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this);
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RpcCall fakeCall = new RpcCall(this, -1);
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setupResponse(fakeCall,
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RpcStatusProto.FATAL, RpcErrorCodeProto.FATAL_VERSION_MISMATCH,
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null, VersionMismatch.class.getName(), errMsg);
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fakeCall.sendResponse();
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} else if (clientVersion >= 3) {
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Call fakeCall = new Call(-1, RpcConstants.INVALID_RETRY_COUNT, null,
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this);
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RpcCall fakeCall = new RpcCall(this, -1);
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// Versions 3 to 8 use older response
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setupResponseOldVersionFatal(buffer, fakeCall,
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null, VersionMismatch.class.getName(), errMsg);
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fakeCall.sendResponse();
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} else if (clientVersion == 2) { // Hadoop 0.18.3
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Call fakeCall = new Call(0, RpcConstants.INVALID_RETRY_COUNT, null,
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this);
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RpcCall fakeCall = new RpcCall(this, 0);
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DataOutputStream out = new DataOutputStream(buffer);
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out.writeInt(0); // call ID
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out.writeBoolean(true); // error
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@ -1950,7 +2057,7 @@ public abstract class Server {
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}
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private void setupHttpRequestOnIpcPortResponse() throws IOException {
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Call fakeCall = new Call(0, RpcConstants.INVALID_RETRY_COUNT, null, this);
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RpcCall fakeCall = new RpcCall(this, 0);
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fakeCall.setResponse(ByteBuffer.wrap(
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RECEIVED_HTTP_REQ_RESPONSE.getBytes(StandardCharsets.UTF_8)));
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fakeCall.sendResponse();
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@ -2098,7 +2205,7 @@ public abstract class Server {
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}
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} catch (WrappedRpcServerException wrse) { // inform client of error
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Throwable ioe = wrse.getCause();
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final Call call = new Call(callId, retry, null, this);
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final RpcCall call = new RpcCall(this, callId, retry);
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setupResponse(call,
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RpcStatusProto.FATAL, wrse.getRpcErrorCodeProto(), null,
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ioe.getClass().getName(), ioe.getMessage());
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@ -2198,8 +2305,9 @@ public abstract class Server {
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.build();
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}
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Call call = new Call(header.getCallId(), header.getRetryCount(),
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rpcRequest, this, ProtoUtil.convert(header.getRpcKind()),
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RpcCall call = new RpcCall(this, header.getCallId(),
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header.getRetryCount(), rpcRequest,
|
||||
ProtoUtil.convert(header.getRpcKind()),
|
||||
header.getClientId().toByteArray(), traceScope, callerContext);
|
||||
|
||||
// Save the priority level assignment by the scheduler
|
||||
|
|
@ -2323,21 +2431,10 @@ public abstract class Server {
|
|||
}
|
||||
}
|
||||
|
||||
private void sendResponse(Call call) throws IOException {
|
||||
private void sendResponse(RpcCall call) throws IOException {
|
||||
responder.doRespond(call);
|
||||
}
|
||||
|
||||
private void abortResponse(Call call, Throwable t) throws IOException {
|
||||
// clone the call to prevent a race with the other thread stomping
|
||||
// on the response while being sent. the original call is
|
||||
// effectively discarded since the wait count won't hit zero
|
||||
call = new Call(call);
|
||||
setupResponse(call,
|
||||
RpcStatusProto.FATAL, RpcErrorCodeProto.ERROR_RPC_SERVER,
|
||||
null, t.getClass().getName(), StringUtils.stringifyException(t));
|
||||
call.sendResponse();
|
||||
}
|
||||
|
||||
/**
|
||||
* Get service class for connection
|
||||
* @return the serviceClass
|
||||
|
|
@ -2388,16 +2485,6 @@ public abstract class Server {
|
|||
if (LOG.isDebugEnabled()) {
|
||||
LOG.debug(Thread.currentThread().getName() + ": " + call + " for RpcKind " + call.rpcKind);
|
||||
}
|
||||
if (!call.connection.channel.isOpen()) {
|
||||
LOG.info(Thread.currentThread().getName() + ": skipped " + call);
|
||||
continue;
|
||||
}
|
||||
String errorClass = null;
|
||||
String error = null;
|
||||
RpcStatusProto returnStatus = RpcStatusProto.SUCCESS;
|
||||
RpcErrorCodeProto detailedErr = null;
|
||||
Writable value = null;
|
||||
|
||||
CurCall.set(call);
|
||||
if (call.traceScope != null) {
|
||||
call.traceScope.reattach();
|
||||
|
|
@ -2406,53 +2493,11 @@ public abstract class Server {
|
|||
}
|
||||
// always update the current call context
|
||||
CallerContext.setCurrent(call.callerContext);
|
||||
|
||||
try {
|
||||
// Make the call as the user via Subject.doAs, thus associating
|
||||
// the call with the Subject
|
||||
if (call.connection.user == null) {
|
||||
value = call(call.rpcKind, call.connection.protocolName, call.rpcRequest,
|
||||
call.timestamp);
|
||||
} else {
|
||||
value =
|
||||
call.connection.user.doAs
|
||||
(new PrivilegedExceptionAction<Writable>() {
|
||||
@Override
|
||||
public Writable run() throws Exception {
|
||||
// make the call
|
||||
return call(call.rpcKind, call.connection.protocolName,
|
||||
call.rpcRequest, call.timestamp);
|
||||
|
||||
}
|
||||
}
|
||||
);
|
||||
}
|
||||
} catch (Throwable e) {
|
||||
if (e instanceof UndeclaredThrowableException) {
|
||||
e = e.getCause();
|
||||
}
|
||||
logException(LOG, e, call);
|
||||
if (e instanceof RpcServerException) {
|
||||
RpcServerException rse = ((RpcServerException)e);
|
||||
returnStatus = rse.getRpcStatusProto();
|
||||
detailedErr = rse.getRpcErrorCodeProto();
|
||||
} else {
|
||||
returnStatus = RpcStatusProto.ERROR;
|
||||
detailedErr = RpcErrorCodeProto.ERROR_APPLICATION;
|
||||
}
|
||||
errorClass = e.getClass().getName();
|
||||
error = StringUtils.stringifyException(e);
|
||||
// Remove redundant error class name from the beginning of the stack trace
|
||||
String exceptionHdr = errorClass + ": ";
|
||||
if (error.startsWith(exceptionHdr)) {
|
||||
error = error.substring(exceptionHdr.length());
|
||||
}
|
||||
}
|
||||
CurCall.set(null);
|
||||
synchronized (call.connection.responseQueue) {
|
||||
setupResponse(call, returnStatus, detailedErr,
|
||||
value, errorClass, error);
|
||||
call.sendResponse();
|
||||
UserGroupInformation remoteUser = call.getRemoteUser();
|
||||
if (remoteUser != null) {
|
||||
remoteUser.doAs(call);
|
||||
} else {
|
||||
call.run();
|
||||
}
|
||||
} catch (InterruptedException e) {
|
||||
if (running) { // unexpected -- log it
|
||||
|
|
@ -2469,6 +2514,7 @@ public abstract class Server {
|
|||
StringUtils.stringifyException(e));
|
||||
}
|
||||
} finally {
|
||||
CurCall.set(null);
|
||||
IOUtils.cleanup(LOG, traceScope);
|
||||
}
|
||||
}
|
||||
|
|
@ -2670,7 +2716,7 @@ public abstract class Server {
|
|||
* @throws IOException
|
||||
*/
|
||||
private void setupResponse(
|
||||
Call call, RpcStatusProto status, RpcErrorCodeProto erCode,
|
||||
RpcCall call, RpcStatusProto status, RpcErrorCodeProto erCode,
|
||||
Writable rv, String errorClass, String error)
|
||||
throws IOException {
|
||||
RpcResponseHeaderProto.Builder headerBuilder =
|
||||
|
|
@ -2704,7 +2750,7 @@ public abstract class Server {
|
|||
}
|
||||
}
|
||||
|
||||
private void setupResponse(Call call,
|
||||
private void setupResponse(RpcCall call,
|
||||
RpcResponseHeaderProto header, Writable rv) throws IOException {
|
||||
ResponseBuffer buf = responseBuffer.get().reset();
|
||||
try {
|
||||
|
|
@ -2738,7 +2784,7 @@ public abstract class Server {
|
|||
* @throws IOException
|
||||
*/
|
||||
private void setupResponseOldVersionFatal(ByteArrayOutputStream response,
|
||||
Call call,
|
||||
RpcCall call,
|
||||
Writable rv, String errorClass, String error)
|
||||
throws IOException {
|
||||
final int OLD_VERSION_FATAL_STATUS = -1;
|
||||
|
|
@ -2751,7 +2797,7 @@ public abstract class Server {
|
|||
call.setResponse(ByteBuffer.wrap(response.toByteArray()));
|
||||
}
|
||||
|
||||
private void wrapWithSasl(Call call) throws IOException {
|
||||
private void wrapWithSasl(RpcCall call) throws IOException {
|
||||
if (call.connection.saslServer != null) {
|
||||
byte[] token = call.rpcResponse.array();
|
||||
// synchronization may be needed since there can be multiple Handler
|
||||
|
|
|
|||
Loading…
Reference in New Issue