alnzng commented on code in PR #1636: URL: https://github.com/apache/samza/pull/1636#discussion_r1015714131
########## samza-core/src/main/java/org/apache/samza/container/host/OshiBasedStatisticsGetter.java: ########## @@ -0,0 +1,90 @@ +/* + * 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. + */ +package org.apache.samza.container.host; + +import com.google.common.annotations.VisibleForTesting; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import org.apache.commons.lang3.NotImplementedException; +import oshi.SystemInfo; +import oshi.software.os.OSProcess; +import oshi.software.os.OperatingSystem; + + +/** + * An implementation of {@link SystemStatisticsGetter} that relies on using oshi framework(https://www.oshi.ooo/) + */ +public class OshiBasedStatisticsGetter implements SystemStatisticsGetter { + // the snapshots of current JVM process and its child processes + private final Map<Integer, OSProcess> previousProcessSnapshots = new HashMap<>(); + + private final OperatingSystem os; + private final int cpuCount; + + public OshiBasedStatisticsGetter() { + this(new SystemInfo()); + } + + @VisibleForTesting + OshiBasedStatisticsGetter(SystemInfo si) { + this(si.getOperatingSystem(), si.getHardware().getProcessor().getPhysicalProcessorCount()); + } + + @VisibleForTesting + OshiBasedStatisticsGetter(OperatingSystem os, int cpuCount) { + this.os = os; + this.cpuCount = cpuCount; + } + + @Override + public SystemMemoryStatistics getSystemMemoryStatistics() { + throw new NotImplementedException("Not implemented"); + } + + @Override + public ProcessCPUStatistics getProcessCPUStatistics() { + final List<OSProcess> currentProcessAndChildProcesses = getCurrentProcessAndChildProcesses(); Review Comment: >but in general, an interface impl should have a clear contract instead of bubbling up exceptions that are internal to its impl and except the caller/user of the interface to deal with it. Make sense. But in this case, I didn't see any checked/unchecked/errors that can be thrown in the current oshi implementation. Will you still suggest that we should catch all Exceptions explicitly or throw Samza its own exception? ########## samza-core/src/main/java/org/apache/samza/container/host/OshiBasedStatisticsGetter.java: ########## @@ -0,0 +1,90 @@ +/* + * 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. + */ +package org.apache.samza.container.host; + +import com.google.common.annotations.VisibleForTesting; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import org.apache.commons.lang3.NotImplementedException; +import oshi.SystemInfo; +import oshi.software.os.OSProcess; +import oshi.software.os.OperatingSystem; + + +/** + * An implementation of {@link SystemStatisticsGetter} that relies on using oshi framework(https://www.oshi.ooo/) + */ +public class OshiBasedStatisticsGetter implements SystemStatisticsGetter { + // the snapshots of current JVM process and its child processes + private final Map<Integer, OSProcess> previousProcessSnapshots = new HashMap<>(); + + private final OperatingSystem os; + private final int cpuCount; + + public OshiBasedStatisticsGetter() { + this(new SystemInfo()); + } + + @VisibleForTesting + OshiBasedStatisticsGetter(SystemInfo si) { + this(si.getOperatingSystem(), si.getHardware().getProcessor().getPhysicalProcessorCount()); + } + + @VisibleForTesting + OshiBasedStatisticsGetter(OperatingSystem os, int cpuCount) { + this.os = os; + this.cpuCount = cpuCount; + } + + @Override + public SystemMemoryStatistics getSystemMemoryStatistics() { + throw new NotImplementedException("Not implemented"); + } + + @Override + public ProcessCPUStatistics getProcessCPUStatistics() { + final List<OSProcess> currentProcessAndChildProcesses = getCurrentProcessAndChildProcesses(); + final double totalCPUUsage = getTotalCPUUsage(currentProcessAndChildProcesses); + refreshProcessSnapshots(currentProcessAndChildProcesses); + return new ProcessCPUStatistics(100d * totalCPUUsage / cpuCount); + } + + private List<OSProcess> getCurrentProcessAndChildProcesses() { + final List<OSProcess> processes = new ArrayList<>(); + // get current process + processes.add(os.getProcess(os.getProcessId())); + // get all child processes of current process + processes.addAll(os.getChildProcesses(os.getProcessId(), OperatingSystem.ProcessFiltering.ALL_PROCESSES, + OperatingSystem.ProcessSorting.NO_SORTING, 0)); + return processes; + } + + private double getTotalCPUUsage(List<OSProcess> processes) { + return processes.stream() + .mapToDouble(p -> p.getProcessCpuLoadBetweenTicks(previousProcessSnapshots.get(p.getProcessID()))) Review Comment: Yes, it will return cumulative data points. And I think it is reasonable and accurate because that's the first data point available in the process start-up phase. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@samza.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
