Hi folks, I am using HTrace 3 with Accumulo. I would like to trace through a MapReduce program that uses Accumulo Input/Output formats. Has anyone done this? I am using Hadoop 2.7.2, HTrace 3.1.0, Accumulo 1.8.0.
I confirm HTrace 3 is working with client java programs that scan Accumulo. I am not sure if Hadoop tracing is working. I added the ZooTraceClient configuration to Hadoop and added the relevant Accumulo jars to Hadoop's classpath, but I don't know if it worked. (I see a new trace entry called ClientNamenodeProtocol that I never saw before, but it's not proof that Hadoop tracing is working.) I don't think the trace is being wrapped around the MapReduce mechanisms that exec Mappers and Reducers over Yarn. Maybe I can make it work by detaching the trace? Would HTrace work if I detach a trace from one process, record the trace ID, send the trace ID to the mappers and reducers, and then re-attach at the mapper and reducer processes? Cheers, Dylan
