Plugin: tracer

• infos = Information about the tracer plugin is in keys below
• infos/author = Markus Raab elekt.nosp@m.ra@l.nosp@m.ibele.nosp@m.ktra.nosp@m..org
• infos/licence = BSD
• infos/provides = tracing
• infos/needs =
• infos/placements = pregetstorage procgetstorage postgetstorage presetstorage precommit postcommit prerollback postrollback
• infos/status = maintained tested nodep configurable global
• infos/description = Traces the execution path of a backend

This plugin is added on every possible position within a backend. It allows you to trace when the backend is executed.

If you want to trace how and if the backend is called:

kdb mount file.ysp user:/trace_point your_storage_plugin tracer

So now we can trace whats below your trace point.

kdb ls user:/trace_point

Ok, no tracer is called because resolver immediately told that there is no file.

kdb get user:/trace_point
#> Did not find key

Ok, same conclusion.

kdb set user:/trace_point hello
#> create a new key user:/trace_point with string "hello"
#> tracer: set(0xd34cc0, user:/trace_point): user:/trace_point 1
#> tracer: set(0xd34cc0, user:/trace_point): user:/trace_point 1
#> tracer: set(0xd34cc0, user:/trace_point): user:/trace_point 1

Now the 3 placements in set are called.

kdb get user:/trace_point
#> tracer: get(0x22e1cc0, user:/trace_point): 0
#> tracer: get(0x22e1cc0, user:/trace_point): 0
#> hello

Now the 2 placements in get are called.

Will not log when loaded as module (config /module present), unless /logmodule is set:

kdb plugin-check -c "logmodule=" tracer