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https://issues.apache.org/jira/browse/HADOOP-18055?focusedWorklogId=700941&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-700941
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ASF GitHub Bot logged work on HADOOP-18055:
-------------------------------------------
Author: ASF GitHub Bot
Created on: 24/Dec/21 09:43
Start Date: 24/Dec/21 09:43
Worklog Time Spent: 10m
Work Description: aajisaka commented on a change in pull request #3824:
URL: https://github.com/apache/hadoop/pull/3824#discussion_r774953239
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/http/ProfileServlet.java
##########
@@ -0,0 +1,393 @@
+/*
+ * 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.hadoop.http;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.hadoop.thirdparty.com.google.common.base.Joiner;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import org.apache.hadoop.classification.InterfaceAudience;
+import org.apache.hadoop.util.ProcessUtils;
+
+/**
+ * Servlet that runs async-profiler as web-endpoint.
+ * <p>
+ * Following options from async-profiler can be specified as query paramater.
+ * // -e event profiling event: cpu|alloc|lock|cache-misses etc.
+ * // -d duration run profiling for 'duration' seconds (integer)
+ * // -i interval sampling interval in nanoseconds (long)
+ * // -j jstackdepth maximum Java stack depth (integer)
+ * // -b bufsize frame buffer size (long)
+ * // -t profile different threads separately
+ * // -s simple class names instead of FQN
+ * // -o fmt[,fmt...] output format:
summary|traces|flat|collapsed|svg|tree|jfr|html
+ * // --width px SVG width pixels (integer)
+ * // --height px SVG frame height pixels (integer)
+ * // --minwidth px skip frames smaller than px (double)
+ * // --reverse generate stack-reversed FlameGraph / Call tree
+ * <p>
+ * Example:
+ * If Namenode http address is 9870, and ResourceManager http address is 8088,
+ * ProfileServlet running with async-profiler setup can be accessed with
+ * http://localhost:9870/prof and http://localhost:8088/prof
Review comment:
Should we comment the NameNode and ResourceManager is running on
localhost?
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Issue Time Tracking
-------------------
Worklog Id: (was: 700941)
Time Spent: 1h 20m (was: 1h 10m)
> Async Profiler endpoint for Hadoop daemons
> ------------------------------------------
>
> Key: HADOOP-18055
> URL: https://issues.apache.org/jira/browse/HADOOP-18055
> Project: Hadoop Common
> Issue Type: New Feature
> Reporter: Viraj Jasani
> Assignee: Viraj Jasani
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> Async profiler ([https://github.com/jvm-profiling-tools/async-profiler]) is a
> low overhead sampling profiler for Java that does not suffer from Safepoint
> bias problem. It features HotSpot-specific APIs to collect stack traces and
> to track memory allocations. The profiler works with OpenJDK, Oracle JDK and
> other Java runtimes based on the HotSpot JVM.
> Async profiler can also profile heap allocations, lock contention, and HW
> performance counters in addition to CPU.
> We have an httpserver based servlet stack hence we can use HIVE-20202 as an
> implementation template to provide async profiler as servlet for Hadoop
> daemons. Ideally we achieve these requirements:
> * Retrieve flamegraph SVG generated from latest profile trace.
> * Online enable and disable of profiling activity. (async-profiler does not
> do instrumentation based profiling so this should not cause the code gen
> related perf problems of that other approach and can be safely toggled on and
> off while under production load.)
> * CPU profiling.
> * ALLOCATION profiling.
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