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https://issues.apache.org/jira/browse/HADOOP-14475?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16254662#comment-16254662
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Sean Mackrory commented on HADOOP-14475:
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{quote}DefaultMetricsSystem lifecycle API is confusing to me.{quote}
Thanks for bringing this up. One point of confusion for me has been the
difference between a system and a context (see my above comments), but one
important thing to note is that most other "systems" represent an entire JVM.
That's not true in this case when the metrics system may exist in the
NodeManager JVM that has its own metrics system(s) already and there may be
multiple instances of S3AFileSystem. I notice that Azure appears to be creating
it's own instance instead of using the singleton. I suspect we should be doing
the same.
> Metrics of S3A don't print out when enable it in Hadoop metrics property file
> ------------------------------------------------------------------------------
>
> Key: HADOOP-14475
> URL: https://issues.apache.org/jira/browse/HADOOP-14475
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs/s3
> Affects Versions: 2.8.0
> Environment: uname -a
> Linux client01 4.4.0-74-generic #95-Ubuntu SMP Wed Apr 12 09:50:34 UTC 2017
> x86_64 x86_64 x86_64 GNU/Linux
> cat /etc/issue
> Ubuntu 16.04.2 LTS \n \l
> Reporter: Yonger
> Assignee: Yonger
> Attachments: HADOOP-14475-003.patch, HADOOP-14475.002.patch,
> HADOOP-14475.005.patch, HADOOP-14475.006.patch, HADOOP-14475.008.patch,
> HADOOP-14475.009.patch, HADOOP-14775.007.patch, failsafe-report-s3a-it.html,
> failsafe-report-s3a-scale.html, failsafe-report-scale.html,
> failsafe-report-scale.zip, s3a-metrics.patch1, stdout.zip
>
>
> *.sink.file.class=org.apache.hadoop.metrics2.sink.FileSink
> #*.sink.file.class=org.apache.hadoop.metrics2.sink.influxdb.InfluxdbSink
> #*.sink.influxdb.url=http:/xxxxxxxxxx
> #*.sink.influxdb.influxdb_port=8086
> #*.sink.influxdb.database=hadoop
> #*.sink.influxdb.influxdb_username=hadoop
> #*.sink.influxdb.influxdb_password=hadoop
> #*.sink.ingluxdb.cluster=c1
> *.period=10
> #namenode.sink.influxdb.class=org.apache.hadoop.metrics2.sink.influxdb.InfluxdbSink
> #S3AFileSystem.sink.influxdb.class=org.apache.hadoop.metrics2.sink.influxdb.InfluxdbSink
> S3AFileSystem.sink.file.filename=s3afilesystem-metrics.out
> I can't find the out put file even i run a MR job which should be used s3.
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