Add Dapper like tracing to HBase. Accumulo added something similar with their cloudtrace package.
Pass Accumulo trace functionality through the DFSClient
Hooks for hbase tracing
remove htrace-zipkin from the runtime dependencies
Add Tracing to HDFS
Add HBase shell command to start/stop tracing
add htrace-zipkin to the runtime dependencies again
consider "full-featured" support for HTrace for HBase debugging