Erik O'Shaughnessy created SPARK-13776:
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Summary: Web UI is not available after ./sbin/start-master.sh
Key: SPARK-13776
URL: https://issues.apache.org/jira/browse/SPARK-13776
Project: Spark
Issue Type: Bug
Components: Web UI
Affects Versions: 1.6.0
Environment: Solaris 11.3, Oracle SPARC T-5 8 with 1024 hardware
threads
Reporter: Erik O'Shaughnessy
The Sparc Web UI fails to become available after starting a Spark master in
stand-alone mode:
$ ./sbin/start-master.sh
The log file contains the following:
{quote}
cat spark-hadoop-org.apache.spark.deploy.master.Master-1-t5-8-002.out
Spark Command: /usr/java/bin/java -cp
/usr/local/spark-1.6.0_nohadoop/conf/:/usr/local/spark-1.6.0_nohadoop/assembly/target/scala-2.10/spark-assembly-1.6.0-hadoop2.2.0.jar:/usr/local/spark-1.6.0_nohadoop/lib_managed/jars/datanucleus-api-jdo-3.2.6.jar:/usr/local/spark-1.6.0_nohadoop/lib_managed/jars/datanucleus-rdbms-3.2.9.jar:/usr/local/spark-1.6.0_nohadoop/lib_managed/jars/datanucleus-core-3.2.10.jar
-Xms1g -Xmx1g org.apache.spark.deploy.master.Master --ip t5-8-002 --port 7077
--webui-port 8080
========================================
16/01/27 12:00:42 WARN AbstractConnector: insufficient threads configured for
SelectChannelConnector@0.0.0.0:8080
16/01/27 12:00:42 WARN AbstractConnector: insufficient threads configured for
SelectChannelConnector@t5-8-002:6066
{quote}
I did some poking around and it seems that message is coming from Jetty and
indicates a mismatch between Jetty's default maxThreads configuration and the
actual number of CPUs available on the hardware (1024). I was not able to find
a way to successfully change Jetty's configuration at run-time.
Our work around was to disable CPUs until the WARN messages did not occur in
the log file, which was when NCPUs = 504.
I don't know for certain that this is isn't a known problem in Jetty from
looking at their bug reports, but I wasn't able to locate a Jetty issue that
described this problem.
While not specifically an Apache Spark problem, I thought documenting it would
at least be helpful.
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