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Optimize a few Spots on IO Loop (#60865) (#61380) 

Saving some cycles here and there on the IO loop:

* Don't instantiate new `Runnable` to execute on `SAME` in a few spots
* Don't instantiate complicated wrapped stream for empty messages
* Stop instantiating almost never used `ClusterStateObserver` in two spots
* Some minor cleanup and preventing pointless `Predicate<>` instantiation in transport master node action
This commit is contained in:
Armin Braun 2020-08-20 20:22:49 +02:00 committed by GitHub
parent a3a0c63ccf
commit 08dbd6d989
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 77 additions and 43 deletions
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48
server/src/main/java/org/elasticsearch/action/support/master/TransportMasterNodeAction.java
View File

@ -107,35 +107,31 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
@Override
protected void doExecute(Task task, final Request request, ActionListener<Response> listener) {
new AsyncSingleAction(task, request, listener).start();
ClusterState state = clusterService.state();
logger.trace("starting processing request [{}] with cluster state version [{}]", request, state.version());
if (task != null) {
request.setParentTask(clusterService.localNode().getId(), task.getId());
}
new AsyncSingleAction(task, request, listener).doStart(state);
}
class AsyncSingleAction {
private final ActionListener<Response> listener;
private final Request request;
private volatile ClusterStateObserver observer;
private ClusterStateObserver observer;
private final long startTime;
private final Task task;
AsyncSingleAction(Task task, Request request, ActionListener<Response> listener) {
this.task = task;
this.request = request;
if (task != null) {
request.setParentTask(clusterService.localNode().getId(), task.getId());
}
this.listener = listener;
}
public void start() {
ClusterState state = clusterService.state();
this.observer
= new ClusterStateObserver(state, clusterService, request.masterNodeTimeout(), logger, threadPool.getThreadContext());
doStart(state);
this.startTime = threadPool.relativeTimeInMillis();
}
protected void doStart(ClusterState clusterState) {
try {
final Predicate<ClusterState> masterChangePredicate = MasterNodeChangePredicate.build(clusterState);
final DiscoveryNodes nodes = clusterState.nodes();
if (nodes.isLocalNodeElectedMaster() || localExecute(request)) {
// check for block, if blocked, retry, else, execute locally
@ -144,8 +140,8 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
if (!blockException.retryable()) {
listener.onFailure(blockException);
} else {
logger.trace("can't execute due to a cluster block, retrying", blockException);
retry(blockException, newState -> {
logger.debug("can't execute due to a cluster block, retrying", blockException);
retry(clusterState, blockException, newState -> {
try {
ClusterBlockException newException = checkBlock(request, newState);
return (newException == null || !newException.retryable());
@ -161,7 +157,7 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
if (t instanceof FailedToCommitClusterStateException || t instanceof NotMasterException) {
logger.debug(() -> new ParameterizedMessage("master could not publish cluster state or " +
"stepped down before publishing action [{}], scheduling a retry", actionName), t);
retry(t, masterChangePredicate);
retryOnMasterChange(clusterState, t);
} else {
delegatedListener.onFailure(t);
}
@ -172,7 +168,7 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
} else {
if (nodes.getMasterNode() == null) {
logger.debug("no known master node, scheduling a retry");
retry(null, masterChangePredicate);
retryOnMasterChange(clusterState, null);
} else {
DiscoveryNode masterNode = nodes.getMasterNode();
final String actionName = getMasterActionName(masterNode);
@ -187,7 +183,7 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
logger.debug("connection exception while trying to forward request with action name [{}] to " +
"master node [{}], scheduling a retry. Error: [{}]",
actionName, nodes.getMasterNode(), exp.getDetailedMessage());
retry(cause, masterChangePredicate);
retryOnMasterChange(clusterState, cause);
} else {
listener.onFailure(exp);
}
@ -200,7 +196,21 @@ public abstract class TransportMasterNodeAction<Request extends MasterNodeReques
}
}
private void retry(final Throwable failure, final Predicate<ClusterState> statePredicate) {
private void retryOnMasterChange(ClusterState state, Throwable failure) {
retry(state, failure, MasterNodeChangePredicate.build(state));
}
private void retry(ClusterState state, final Throwable failure, final Predicate<ClusterState> statePredicate) {
if (observer == null) {
final long remainingTimeoutMS = request.masterNodeTimeout().millis() - (threadPool.relativeTimeInMillis() - startTime);
if (remainingTimeoutMS <= 0) {
logger.debug(() -> new ParameterizedMessage("timed out before retrying [{}] after failure", actionName), failure);
listener.onFailure(new MasterNotDiscoveredException(failure));
return;
}
this.observer = new ClusterStateObserver(
state, clusterService, TimeValue.timeValueMillis(remainingTimeoutMS), logger, threadPool.getThreadContext());
}
observer.waitForNextChange(
new ClusterStateObserver.Listener() {
@Override

50
server/src/main/java/org/elasticsearch/transport/InboundHandler.java
View File

@ -22,7 +22,9 @@ package org.elasticsearch.transport;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.Version;
import org.elasticsearch.common.io.stream.ByteBufferStreamInput;
import org.elasticsearch.common.io.stream.NamedWriteableAwareStreamInput;
import org.elasticsearch.common.io.stream.NamedWriteableRegistry;
import org.elasticsearch.common.io.stream.StreamInput;
@ -33,6 +35,7 @@ import org.elasticsearch.threadpool.ThreadPool;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
public class InboundHandler {
@ -79,6 +82,9 @@ public class InboundHandler {
}
}
// Empty stream constant to avoid instantiating a new stream for empty messages.
private static final StreamInput EMPTY_STREAM_INPUT = new ByteBufferStreamInput(ByteBuffer.wrap(BytesRef.EMPTY_BYTES));
private void messageReceived(TcpChannel channel, InboundMessage message) throws IOException {
final InetSocketAddress remoteAddress = channel.getRemoteAddress();
final Header header = message.getHeader();
@ -94,8 +100,6 @@ public class InboundHandler {
} else {
// Responses do not support short circuiting currently
assert message.isShortCircuit() == false;
final StreamInput streamInput = namedWriteableStream(message.openOrGetStreamInput());
assertRemoteVersion(streamInput, header.getVersion());
final TransportResponseHandler<?> handler;
long requestId = header.getRequestId();
if (header.isHandshake()) {
@ -111,6 +115,10 @@ public class InboundHandler {
}
// ignore if its null, the service logs it
if (handler != null) {
final StreamInput streamInput;
if (message.getContentLength() > 0 || header.getVersion().equals(Version.CURRENT) == false) {
streamInput = namedWriteableStream(message.openOrGetStreamInput());
assertRemoteVersion(streamInput, header.getVersion());
if (header.isError()) {
handlerResponseError(streamInput, handler);
} else {
@ -120,8 +128,13 @@ public class InboundHandler {
final int nextByte = streamInput.read();
// calling read() is useful to make sure the message is fully read, even if there is an EOS marker
if (nextByte != -1) {
throw new IllegalStateException("Message not fully read (response) for requestId [" + requestId + "], handler ["
+ handler + "], error [" + header.isError() + "]; resetting");
throw new IllegalStateException("Message not fully read (response) for requestId ["
+ requestId + "], handler [" + handler + "], error [" + header.isError()
+ "]; resetting");
}
} else {
assert header.isError() == false;
handleResponse(remoteAddress, EMPTY_STREAM_INPUT, handler);
}
}
}
@ -173,12 +186,20 @@ public class InboundHandler {
throw new IllegalStateException("Message not fully read (request) for requestId [" + requestId + "], action ["
+ action + "], available [" + stream.available() + "]; resetting");
}
threadPool.executor(reg.getExecutor()).execute(new RequestHandler<>(reg, request, transportChannel));
final String executor = reg.getExecutor();
if (ThreadPool.Names.SAME.equals(executor)) {
try {
reg.processMessageReceived(request, transportChannel);
} catch (Exception e) {
sendErrorResponse(reg.getAction(), transportChannel, e);
}
} else {
threadPool.executor(executor).execute(new RequestHandler<>(reg, request, transportChannel));
}
}
} catch (Exception e) {
sendErrorResponse(action, transportChannel, e);
}
}
}
@ -202,17 +223,20 @@ public class InboundHandler {
"Failed to deserialize response from handler [" + handler + "]", e));
return;
}
threadPool.executor(handler.executor()).execute(new AbstractRunnable() {
@Override
public void onFailure(Exception e) {
handleException(handler, new ResponseHandlerFailureTransportException(e));
final String executor = handler.executor();
if (ThreadPool.Names.SAME.equals(executor)) {
doHandleResponse(handler, response);
} else {
threadPool.executor(executor).execute(() -> doHandleResponse(handler, response));
}
}
@Override
protected void doRun() {
private <T extends TransportResponse> void doHandleResponse(TransportResponseHandler<T> handler, T response) {
try {
handler.handleResponse(response);
} catch (Exception e) {
handleException(handler, new ResponseHandlerFailureTransportException(e));
}
});
}
private void handlerResponseError(StreamInput stream, final TransportResponseHandler<?> handler) {