Proposed hadoop instrumentation API
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Key: HADOOP-3772
URL: https://issues.apache.org/jira/browse/HADOOP-3772
Project: Hadoop Core
Issue Type: Improvement
Components: metrics
Reporter: Ari Rabkin
We want to evolve the Hadoop metrics subsystem into a more generic
Instrumentation facility. The ultimate goal is to add structured logging to
Hadoop, with causal tags, a la X-trace. The existing metrics framework is not
quite suitable for our needs, since the implementation and interface are
tightly coupled. There's no way to use the metrics instrumentation points for
anything other than metricss, and there's no way for a metrics context to find
out what event just happened.
We want to tease apart the generic notion of hookable instrumentation points,
from the specifics of the information recording. The latter ought to be
pluggable at run-time.
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