GitHub user devaraj-kavali opened a pull request:
https://github.com/apache/spark/pull/21071
[SPARK-21962][CORE] Distributed Tracing in Spark
## What changes were proposed in this pull request?
This PR integrates with HTrace, it sends traces for the application and
tasks when the span receivers are configured. The trace configurations can be
updated along with spark configurations by adding prefix 'spark.htrace.' to the
HTrace configurations like below,
`spark.htrace.span.receiver.classes`
org.apache.htrace.core.LocalFileSpanReceiver;org.apache.htrace.impl.HTracedSpanReceiver;org.apache.htrace.impl.ZipkinSpanReceiver
`spark.htrace.htraced.receiver.address` IP:PORT
`spark.htrace.local.file.span.receiver.path` /path/local-span-file
`spark.htrace.sampler.classes` org.apache.htrace.core.AlwaysSampler
And also it provides an additional configuration to receive the parent span
with the config name `spark.app.spanId`, if the `spark.app.spanId`
configuration exist then it takes it as parent span, otherwise it starts a new
span for each application.
## How was this patch tested?
I have verified using the existing tests with the added test and also
verified manually in all these below deployment modes with different tracers
individually and together.
1. Local and local-cluster
2. Standalone Client and Cluster modes
3. Yarn Client and Cluster modes
4. Mesos Client and Cluster modes
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/devaraj-kavali/spark SPARK-21962
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/spark/pull/21071.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #21071
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commit 254e4ed38411d45cc8c2ba8cdace069da219c359
Author: Devaraj K <devaraj@...>
Date: 2018-04-14T00:06:36Z
[SPARK-21962][CORE] Distributed Tracing in Spark
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