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[SPARK-8405][Doc] Add how to view logs on Web UI when yarn log aggregation is enabled #7463

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[SPARK-8405][Doc] Add how to view logs on Web UI when yarn log aggregation is enabled #7463

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e5775c1
Update doc about how to view the logs on Web UI when yarn log aggrega…
carsonwang Jul 17, 2015
5a95046
Update the text in the doc
carsonwang Jul 20, 2015
74df3a1
address comments
carsonwang Jul 22, 2015
274c054
Minor text fix
carsonwang Jul 25, 2015
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4 changes: 2 additions & 2 deletions docs/running-on-yarn.md
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Expand Up @@ -68,9 +68,9 @@ In YARN terminology, executors and application masters run inside "containers".

yarn logs -applicationId <app ID>

will print out the contents of all log files from all containers from the given application. You can also view the container log files directly in HDFS using the HDFS shell or API. The directory where they are located can be found by looking at your YARN configs (`yarn.nodemanager.remote-app-log-dir` and `yarn.nodemanager.remote-app-log-dir-suffix`).
will print out the contents of all log files from all containers from the given application. You can also view the container log files directly in HDFS using the HDFS shell or API. The directory where they are located can be found by looking at your YARN configs (`yarn.nodemanager.remote-app-log-dir` and `yarn.nodemanager.remote-app-log-dir-suffix`). The logs are also available on Web UI. You need have both the Spark history server and the MR history server running and configure `yarn.log.server.url` in yarn-site.xml properly. The log url on the Spark history server UI will redirect you to the MR history server to show the aggregated logs.
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Minor text updates: MR history server -> MapReduce History Server. I'd hyperlink one of them too. url -> URL. back-tick yarn-site.xml It would be nice to link through to YARN docs that would describe these parameters too, if possible.


When log aggregation isn't turned on, logs are retained locally on each machine under `YARN_APP_LOGS_DIR`, which is usually configured to `/tmp/logs` or `$HADOOP_HOME/logs/userlogs` depending on the Hadoop version and installation. Viewing logs for a container requires going to the host that contains them and looking in this directory. Subdirectories organize log files by application ID and container ID.
When log aggregation isn't turned on, logs are retained locally on each machine under `YARN_APP_LOGS_DIR`, which is usually configured to `/tmp/logs` or `$HADOOP_HOME/logs/userlogs` depending on the Hadoop version and installation. Viewing logs for a container requires going to the host that contains them and looking in this directory. Subdirectories organize log files by application ID and container ID. The logs are also available on Web UI even without running the MR history server.

To review per-container launch environment, increase `yarn.nodemanager.delete.debug-delay-sec` to a
large value (e.g. 36000), and then access the application cache through `yarn.nodemanager.local-dirs`
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