Viraj Jasani created HADOOP-18055:
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Summary: 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
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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