BTrace scripts for investigate internals of Hadoop.

Work in progress

Usage

Compile the current project

mvn package

Download btrace

Get the latest release from here: https://github.com/btraceio/btrace/releases

mkdir btrace
cd btrace
wget https://github.com/btraceio/btrace/releases/download/v1.3.9/btrace-bin-1.3.9.zip
unzip btrace*.zip

Attach to an existing process

Find the process id of your java app:

jps -l
18 org.apache.hadoop.hdfs.server.namenode.NameNode
114 sun.tools.jps.Jps

Join to the process:

./btrace -u 18 target/classes/META-INF/btrace/RpcCalls.class