cgroup monitors: Add mem/disk/cpu usage metrics for V2 #16905
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * 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. | ||
| */ | ||
|
|
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| package org.apache.druid.java.util.metrics; | ||
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| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.collect.ImmutableMap; | ||
| import com.google.common.primitives.Longs; | ||
| import org.apache.druid.java.util.common.logger.Logger; | ||
| import org.apache.druid.java.util.emitter.service.ServiceEmitter; | ||
| import org.apache.druid.java.util.emitter.service.ServiceMetricEvent; | ||
| import org.apache.druid.java.util.metrics.cgroups.CgroupDiscoverer; | ||
| import org.apache.druid.java.util.metrics.cgroups.Cpu; | ||
| import org.apache.druid.java.util.metrics.cgroups.ProcCgroupV2Discoverer; | ||
| import org.apache.druid.java.util.metrics.cgroups.ProcSelfCgroupDiscoverer; | ||
|
|
||
| import java.io.BufferedReader; | ||
| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Paths; | ||
| import java.time.Instant; | ||
| import java.time.temporal.ChronoUnit; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import java.util.regex.Pattern; | ||
|
|
||
| /** | ||
| * Monitor that reports cpu usage stats by reading `cpu.stat` reported by cgroupv2 | ||
| */ | ||
| public class CgroupV2CpuMonitor extends FeedDefiningMonitor | ||
| { | ||
| private static final Logger LOG = new Logger(CgroupV2CpuMonitor.class); | ||
| private static final String CPU_STAT_FILE = "cpu.stat"; | ||
| private static final String SNAPSHOT = "snapshot"; | ||
| final CgroupDiscoverer cgroupDiscoverer; | ||
| final Map<String, String[]> dimensions; | ||
| private final KeyedDiff diff = new KeyedDiff(); | ||
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| public CgroupV2CpuMonitor(CgroupDiscoverer cgroupDiscoverer, final Map<String, String[]> dimensions, String feed) | ||
| { | ||
| super(feed); | ||
| this.cgroupDiscoverer = cgroupDiscoverer; | ||
| this.dimensions = dimensions; | ||
| } | ||
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| @VisibleForTesting | ||
| CgroupV2CpuMonitor(CgroupDiscoverer cgroupDiscoverer) | ||
| { | ||
| this(cgroupDiscoverer, ImmutableMap.of(), DEFAULT_METRICS_FEED); | ||
| } | ||
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| CgroupV2CpuMonitor() | ||
| { | ||
| this(new ProcSelfCgroupDiscoverer(ProcCgroupV2Discoverer.class)); | ||
| } | ||
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| @Override | ||
| public boolean doMonitor(ServiceEmitter emitter) | ||
| { | ||
| final ServiceMetricEvent.Builder builder = builder(); | ||
| MonitorUtils.addDimensionsToBuilder(builder, dimensions); | ||
| Snapshot snapshot = snapshot(); | ||
| final Map<String, Long> elapsed = diff.to( | ||
| "usage", | ||
| ImmutableMap.<String, Long>builder() | ||
| .put(CgroupUtil.USER, snapshot.getUserUsec()) | ||
| .put(CgroupUtil.SYSTEM, snapshot.getSystemUsec()) | ||
| .put(CgroupUtil.TOTAL, snapshot.getUsageUsec()) | ||
| .put(SNAPSHOT, ChronoUnit.MICROS.between(Instant.EPOCH, Instant.now())) | ||
| .build() | ||
| ); | ||
|
|
||
| if (elapsed != null) { | ||
| long elapsedUsecs = elapsed.get(SNAPSHOT); | ||
| double totalUsagePct = 100.0 * elapsed.get(CgroupUtil.TOTAL) / elapsedUsecs; | ||
| double sysUsagePct = 100.0 * elapsed.get(CgroupUtil.SYSTEM) / elapsedUsecs; | ||
| double userUsagePct = 100.0 * elapsed.get(CgroupUtil.USER) / elapsedUsecs; | ||
| emitter.emit(builder.setMetric(CgroupUtil.CPU_TOTAL_USAGE_METRIC, totalUsagePct)); | ||
| emitter.emit(builder.setMetric(CgroupUtil.CPU_SYS_USAGE_METRIC, sysUsagePct)); | ||
| emitter.emit(builder.setMetric(CgroupUtil.CPU_USER_USAGE_METRIC, userUsagePct)); | ||
| } | ||
| return true; | ||
| } | ||
|
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| /* | ||
| file: cpu.stat | ||
|
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| sample content: | ||
| usage_usec 2379951538 | ||
| user_usec 1802023024 | ||
| system_usec 577928513 | ||
| nr_periods 1581231 | ||
| nr_throttled 59 | ||
| throttled_usec 3095133 | ||
| */ | ||
| public Snapshot snapshot() | ||
| { | ||
| Map<String, Long> entries = new HashMap<>(); | ||
| try (final BufferedReader reader = Files.newBufferedReader( | ||
| Paths.get(cgroupDiscoverer.discover(Cpu.CGROUP).toString(), CPU_STAT_FILE) | ||
| )) { | ||
| for (String line = reader.readLine(); line != null; line = reader.readLine()) { | ||
| final String[] parts = line.split(Pattern.quote(" ")); | ||
| if (parts.length != 2) { | ||
| // ignore | ||
| continue; | ||
| } | ||
| entries.put(parts[0], Longs.tryParse(parts[1])); | ||
| } | ||
| } | ||
| catch (IOException | RuntimeException ex) { | ||
| LOG.error(ex, "Unable to fetch cpu snapshot"); | ||
| } | ||
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| return new Snapshot(entries.get("usage_usec"), entries.get("user_usec"), entries.get("system_usec")); | ||
| } | ||
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| public static class Snapshot | ||
| { | ||
| private final long usageUsec; | ||
| private final long userUsec; | ||
| private final long systemUsec; | ||
|
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| public Snapshot(long usageUsec, long userUsec, long systemUsec) | ||
|
Contributor
There was a problem hiding this comment. Should the constructor accept
Contributor
Author
There was a problem hiding this comment. We basically skip emitting metrics on parse exceptions and would not end up creating this Snapshot object at all. |
||
| { | ||
| this.usageUsec = usageUsec; | ||
| this.userUsec = userUsec; | ||
| this.systemUsec = systemUsec; | ||
| } | ||
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| public long getUsageUsec() | ||
| { | ||
| return usageUsec; | ||
| } | ||
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| public long getUserUsec() | ||
| { | ||
| return userUsec; | ||
| } | ||
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| public long getSystemUsec() | ||
| { | ||
| return systemUsec; | ||
| } | ||
| } | ||
| } | ||
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