Github user jongyoul commented on the pull request:
https://github.com/apache/spark/pull/5063#issuecomment-85920174
@tnachen @elyast I've updated it to support fractional number of cores for
executors. Please review this PR. I've tested my cluster. My setting is
```
AVA_HOME=/app/jdk HADOOP_HOME=/app/hdfs HADOOP_CONF_DIR=/app/hdfs/conf
MESOS_NATIVE_JAVA_LIBRARY=/app/mesos-0.21.0/lib/libmesos.so
SPARK_EXECUTOR_MEMORY=5G
spark-1.4.0-SNAPSHOT-bin-2.5.0-cdh5.3.0/bin/spark-shell --master
mesos://zk://dicc-m001:2181,dicc-m002:2181,dicc-m003:2181/mesos-0.21.0 --conf
spark.executor.uri=hdfs:///app/spark/spark-1.4.0-SNAPSHOT-bin-2.5.0-cdh5.3.0.tgz
--conf spark.io.compression.codec=lzf --conf spark.task.cpus=5 --conf
spark.mesos.executor.cores=0.1
```
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