Error on flamegraph output - Githubissues

etsy / statsd-jvm-profiler

Simple JVM Profiler Using StatsD and Other Metrics Backends

MIT License

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Error on flamegraph output #6

Closed danosipov closed 9 years ago

danosipov commented 9 years ago

I ran the profiler, and see the CPU trace metrics in graphite. However, when I ran graphite_dump.py, it fails with this error:

$ /usr/local/graphite_dump.py -o 127.0.0.1 -s 20:25_20150312 -e 20:50_20150312 -p stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace
Traceback (most recent call last):
  File "/usr/local/graphite_dump.py", line 82, in <module>
    format_output(args.prefix, results)
  File "/usr/local/graphite_dump.py", line 67, in format_output
    print '%s %d' % (format_metric(metric, prefix), value)
TypeError: %d format: a number is required, not NoneType

Adding a null check to value on line 67 produces no output. Let me know if the error is in my StatsD/Graphite setup (I've used a default configuration)

ajsquared commented 9 years ago

I will take a look at this and let you know what I find.

ajsquared commented 9 years ago

Could you give me a list of the metrics that appear under stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace?

danosipov commented 9 years ago

Here is the output from http://graphite.host/metrics/expand?query=stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.*

Let me know if it contains what you're looking for

{"results": ["stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.10", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.149", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.cascading-flow-planner-BaseFlowStep-getPathsBetween", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.cascading-pipe-Operator-equals", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.cascading-scheme-hadoop-TextLine-sourceHandleInput", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.cascading-tuple-Tuple-size", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.com-fasterxml-jackson-annotation-JsonAutoDetectVisibility-isVisible", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.com-fasterxml-jackson-core-json-JsonReadContext-init", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.com-fasterxml-jackson-core-json-ReaderBasedJsonParser-_finishString2", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.com-fasterxml-jackson-core-sym-CharsToNameCanonicalizer-hashSeed", "stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.com-fasterxml-jackson-databind-BeanDescription-getBeanClass", 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ajsquared commented 9 years ago

That looks pretty reasonable. Could you apply this patch https://gist.github.com/ajsquared/9fb38229132d19e750f5 and run the script again? It will produce some debugging output that may help track down the issue.

danosipov commented 9 years ago

Lots o' output, but looks like json_results is empty Truncated:

Bounds: 10 149
[u'stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.cascading-scheme-hadoop-TextLine-sourceHandleInput.cascading-scheme-hadoop-TextLine-source.cascading-tuple-TupleEntrySchemeIterator-getNext.cascading-tuple-TupleEntrySchemeIterator-hasNext.cascading-flow-stream-SourceStage-map.cascading-flow-stream-SourceStage-run.cascading-flow-hadoop-FlowMapper-run.org-apache-hadoop-mapred-MapTask-runOldMapper.org-apache-hadoop-mapred-MapTask-run.org-apache-hadoop-mapred-Child4-run.java-security-AccessController-doPrivileged.javax-security-auth-Subject-doAs.org-apache-hadoop-security-UserGroupInformation-doAs.org-apache-hadoop-mapred-Child-main', u'stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.com-twitter-scalding-typed-MapFn-apply.com-twitter-scalding-FlatMapFunction-operate.cascading-flow-stream-FunctionEachStage-receive.cascading-flow-stream-FunctionEachStage-receive.cascading-flow-stream-SourceStage-map.cascading-flow-stream-SourceStage-run.cascading-flow-hadoop-FlowMapper-run.org-apache-hadoop-mapred-MapTask-runOldMapper.org-apache-hadoop-mapred-MapTask-run.org-apache-hadoop-mapred-Child4-run.java-security-AccessController-doPrivileged.javax-security-auth-Subject-doAs.org-apache-hadoop-security-UserGroupInformation-doAs.org-apache-hadoop-mapred-Child-main', u'stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.java-lang-System-currentTimeMillis.cascading-tap-hadoop-util-MeasuredRecordReader-next.cascading-scheme-hadoop-TextLine-sourceReadInput.cascading-scheme-hadoop-TextLine-source.cascading-tuple-TupleEntrySchemeIterator-getNext.cascading-tuple-TupleEntrySchemeIterator-hasNext.cascading-flow-stream-SourceStage-map.cascading-flow-stream-SourceStage-run.cascading-flow-hadoop-FlowMapper-run.org-apache-hadoop-mapred-MapTask-runOldMapper.org-apache-hadoop-mapred-MapTask-run.org-apache-hadoop-mapred-Child4-run.java-security-AccessController-doPrivileged.javax-security-auth-Subject-doAs.org-apache-hadoop-security-UserGroupInformation-doAs.org-apache-hadoop-mapred-Child-main', u'stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.com-shazam-TitleExtractoranonfun3-apply.scala-collection-Iteratoranon11-next.scala-collection-Iteratorclass-foreach.scala-collection-AbstractIterator-foreach.com-twitter-scalding-FlatMapFunction-operate.cascading-flow-stream-FunctionEachStage-receive.cascading-flow-stream-FunctionEachStage-receive.cascading-flow-stream-SourceStage-map.cascading-flow-stream-SourceStage-run.cascading-flow-hadoop-FlowMapper-run.org-apache-hadoop-mapred-MapTask-runOldMapper.org-apache-hadoop-mapred-MapTask-run.org-apache-hadoop-mapred-Child4-run.java-security-AccessController-doPrivileged.javax-security-auth-Subject-doAs.org-apache-hadoop-security-UserGroupInformation-doAs.org-apache-hadoop-mapred-Child-main', u'stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.java-lang-String-checkBounds.java-lang-String-init.cascading-scheme-hadoop-TextLine-makeEncodedString.cascading-scheme-hadoop-TextLine-sourceHandleInput.cascading-scheme-hadoop-TextLine-source.cascading-tuple-TupleEntrySchemeIterator-getNext.cascading-tuple-TupleEntrySchemeIterator-hasNext.cascading-flow-stream-SourceStage-map.cascading-flow-stream-SourceStage-run.cascading-flow-hadoop-FlowMapper-run.org-apache-hadoop-mapred-MapTask-runOldMapper.org-apache-hadoop-mapred-MapTask-run.org-apache-hadoop-mapred-Child4-run.java-security-AccessController-doPrivileged.javax-security-auth-Subject-doAs.org-apache-hadoop-security-UserGroupInformation-doAs.org-apache-hadoop-mapred-Child-main', ...]
[]

ajsquared commented 9 years ago

Hmm that is pretty odd. If you pick one of the leaf metrics (e.g stats.gauges.bigdata.profiler.hadoop.com.shazam.TitleExtractor.C83612C60A954CB4A442C56597331C5E.1.cpu.trace.cascading-scheme-hadoop-TextLine-sourceHandleInput.cascading-scheme-hadoop-TextLine-source.cascading-tuple-TupleEntrySchemeIterator-getNext.cascading-tuple-TupleEntrySchemeIterator-hasNext.cascading-flow-stream-SourceStage-map.cascading-flow-stream-SourceStage-run.cascading-flow-hadoop-FlowMapper-run.org-apache-hadoop-mapred-MapTask-runOldMapper.org-apache-hadoop-mapred-MapTask-run.org-apache-hadoop-mapred-Child4-run.java-security-AccessController-doPrivileged.javax-security-auth-Subject-doAs.org-apache-hadoop-security-UserGroupInformation-doAs.org-apache-hadoop-mapred-Child-main), do you see any values in Graphite for it?

Also, what version of Graphite are you using?

danosipov commented 9 years ago

Hmm, they appear empty. That might be a problem I'm using Graphite 0.9.13, with StatsD running on the same server.

ajsquared commented 9 years ago

I'm on 0.9.12, but I'm not aware of any changes in 0.9.13 that would cause issues like this. The metrics definitely seem to be making it to Graphite or else you wouldn't even see the list of leaves. Are they entry for all time or just the time range you'd expect values there? I am wondering if the values were record from a different time zone or something to that effect.

danosipov commented 9 years ago

I'm attempting to rerun the profiler, but now my bound metrics are missing. Do they appear after some time?

The metrics are empty for all time. I was running StatsD with debug mode turned on to see that connections were working, I've restarted it in non-debug mode.

The heap/gc metrics are in place and contain data.

ajsquared commented 9 years ago

The bounds would appear at the end of profiling. StatsD might be dropping packets.

ajsquared commented 9 years ago

Did you have any luck with StatsD in non-debug mode?

danosipov commented 9 years ago

Unfortunately no, but I'm investigating if StatsD or Graphite are dropping stats. I'm following the advice given here: http://stackoverflow.com/a/18491559/680399 Let me know if you know any other places to check. Also, I guess this issue can be closed, as the flamegraph generation is probably fine.

ajsquared commented 9 years ago

That does look like a good place to start. I will close for now, but if you run into other problems with it let me know!