Updated Hadoop Compatible File System (markdown)

Hadoop-Compatible-File-System.md

@@ -77,8 +77,35 @@ Follow instructions on spark doc:
 * https://spark.apache.org/docs/latest/configuration.html#inheriting-hadoop-cluster-configuration
 * https://spark.apache.org/docs/latest/configuration.html#custom-hadoophive-configuration
 
+## installation inheriting from Hadoop cluster configuration
+
 Inheriting from Hadoop cluster configuration should be the easiest way. 
 
+To make these files visible to Spark, set HADOOP_CONF_DIR in $SPARK_HOME/conf/spark-env.sh to a location containing the configuration file `core-site.xml`, usually `/etc/hadoop/conf`
+
+## installation not inheriting from Hadoop cluster configuration
+
+Copy the seaweedfs-hadoop-client-x.x.x.jar to all executor machines.
+
+Add the following to spark/conf/spark-defaults.conf on every node running Spark
+```
+spark.driver.extraClassPath   /path/to/seaweedfs-hadoop-client-x.x.x.jar
+spark.executor.extraClassPath /path/to/seaweedfs-hadoop-client-x.x.x.jar
+```
+
+And modify the configuration at runntime:
+
+```
+./bin/spark-submit \ 
+  --name "My app" \ 
+  --master local[4] \  
+  --conf spark.eventLog.enabled=false \ 
+  --conf "spark.executor.extraJavaOptions=-XX:+PrintGCDetails -XX:+PrintGCTimeStamps" \ 
+  --conf spark.hadoop.fs.seaweedfs.impl=seaweed.hdfs.SeaweedFileSystem \ 
+  --conf spark.hadoop.fs.defaultFS=seaweedfs://localhost:8888 \ 
+  myApp.jar
+```
+
 # Installation for HBase
 If HBase is used, create a folder and configure the HBase root directory in `etc/hbase/conf/hbase-site.xml`: