/
MetricsTracer.java
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/
MetricsTracer.java
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/*
* Copyright 2020 Google LLC
*
* Licensed 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
*
* https://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 com.google.cloud.bigtable.data.v2.stub.metrics;
import com.google.api.gax.tracing.ApiTracerFactory.OperationType;
import com.google.api.gax.tracing.BaseApiTracer;
import com.google.api.gax.tracing.SpanName;
import com.google.common.base.Stopwatch;
import io.opencensus.stats.MeasureMap;
import io.opencensus.stats.StatsRecorder;
import io.opencensus.tags.TagContext;
import io.opencensus.tags.TagContextBuilder;
import io.opencensus.tags.TagKey;
import io.opencensus.tags.TagValue;
import io.opencensus.tags.Tagger;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.CancellationException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import javax.annotation.Nullable;
import org.threeten.bp.Duration;
class MetricsTracer extends BaseApiTracer {
private final OperationType operationType;
private final Tagger tagger;
private final StatsRecorder stats;
// Tags
private final TagContext parentContext;
private final SpanName spanName;
private final Map<TagKey, TagValue> statsAttributes;
// Operation level metrics
private final AtomicBoolean opFinished = new AtomicBoolean();
private final Stopwatch operationTimer = Stopwatch.createStarted();
private final Stopwatch firstResponsePerOpTimer = Stopwatch.createStarted();
private long operationResponseCount = 0;
// Attempt level metrics
private int attemptCount = 0;
private Stopwatch attemptTimer;
private long attemptResponseCount = 0;
MetricsTracer(
OperationType operationType,
Tagger tagger,
StatsRecorder stats,
SpanName spanName,
Map<TagKey, TagValue> statsAttributes) {
this.operationType = operationType;
this.tagger = tagger;
this.stats = stats;
this.parentContext = tagger.getCurrentTagContext();
this.spanName = spanName;
this.statsAttributes = statsAttributes;
}
@Override
public Scope inScope() {
return new Scope() {
@Override
public void close() {}
};
}
@Override
public void operationSucceeded() {
recordOperationCompletion(null);
}
@Override
public void operationCancelled() {
recordOperationCompletion(new CancellationException());
}
@Override
public void operationFailed(Throwable throwable) {
recordOperationCompletion(throwable);
}
private void recordOperationCompletion(@Nullable Throwable throwable) {
if (!opFinished.compareAndSet(false, true)) {
return;
}
operationTimer.stop();
long elapsed = operationTimer.elapsed(TimeUnit.MILLISECONDS);
MeasureMap measures =
stats
.newMeasureMap()
.put(RpcMeasureConstants.BIGTABLE_OP_LATENCY, elapsed)
.put(RpcMeasureConstants.BIGTABLE_OP_ATTEMPT_COUNT, attemptCount);
if (operationType == OperationType.ServerStreaming
&& spanName.getMethodName().equals("ReadRows")) {
measures.put(
RpcMeasureConstants.BIGTABLE_READ_ROWS_FIRST_ROW_LATENCY,
firstResponsePerOpTimer.elapsed(TimeUnit.MILLISECONDS));
}
TagContextBuilder tagCtx =
newTagCtxBuilder()
.putLocal(RpcMeasureConstants.BIGTABLE_STATUS, Util.extractStatus(throwable));
measures.record(tagCtx.build());
}
@Override
public void connectionSelected(String s) {
// noop: cardinality for connection ids is too high to use as tags
}
@Override
public void attemptStarted(int i) {
attemptCount++;
attemptTimer = Stopwatch.createStarted();
attemptResponseCount = 0;
}
@Override
public void attemptSucceeded() {
recordAttemptCompletion(null);
}
@Override
public void attemptCancelled() {
recordAttemptCompletion(new CancellationException());
}
@Override
public void attemptFailed(Throwable throwable, Duration duration) {
recordAttemptCompletion(throwable);
}
@Override
public void attemptFailedRetriesExhausted(Throwable throwable) {
recordAttemptCompletion(throwable);
}
@Override
public void attemptPermanentFailure(Throwable throwable) {
recordAttemptCompletion(throwable);
}
private void recordAttemptCompletion(@Nullable Throwable throwable) {
MeasureMap measures =
stats
.newMeasureMap()
.put(
RpcMeasureConstants.BIGTABLE_ATTEMPT_LATENCY,
attemptTimer.elapsed(TimeUnit.MILLISECONDS));
TagContextBuilder tagCtx =
newTagCtxBuilder()
.putLocal(RpcMeasureConstants.BIGTABLE_STATUS, Util.extractStatus(throwable));
measures.record(tagCtx.build());
}
@Override
public void lroStartFailed(Throwable throwable) {
// noop
}
@Override
public void lroStartSucceeded() {
// noop
}
@Override
public void responseReceived() {
if (firstResponsePerOpTimer.isRunning()) {
firstResponsePerOpTimer.stop();
}
attemptResponseCount++;
operationResponseCount++;
}
@Override
public void requestSent() {
// noop: no operations are client streaming
}
@Override
public void batchRequestSent(long elementCount, long requestSize) {
// noop
}
public void batchRequestThrottled(long totalThrottledMs) {
MeasureMap measures =
stats
.newMeasureMap()
.put(RpcMeasureConstants.BIGTABLE_BATCH_THROTTLED_TIME, totalThrottledMs);
measures.record(newTagCtxBuilder().build());
}
private TagContextBuilder newTagCtxBuilder() {
TagContextBuilder tagCtx =
tagger
.toBuilder(parentContext)
.putLocal(RpcMeasureConstants.BIGTABLE_OP, TagValue.create(spanName.toString()));
// Copy client level tags in
for (Entry<TagKey, TagValue> entry : statsAttributes.entrySet()) {
tagCtx.putLocal(entry.getKey(), entry.getValue());
}
return tagCtx;
}
}