out_exec_filter fails tests

[polm]

Using 0.10.9, fails with:

Finished tests in 4.680640s, 1.0682 tests/s, 4.2729 assertions/s.

  1) Failure:
test_emit_3(ExecFilterOutputTest) [out_exec_filter.rb:130]:
<2> expected but was
<0>.

  2) Failure:
test_emit_4(ExecFilterOutputTest) [out_exec_filter.rb:155]:
<2> expected but was
<0>.

5 tests, 20 assertions, 2 failures, 0 errors, 0 skips

I can't get it to work with anything more complex than cat. The idea is that it calls a command, feeds it events as input, and reads the output of that command to generate new events, right? That seems to be the idea but the documentation isn't very clear...

I'm using Scientific Linux 6.1, which is apparently a RHEL variant.

Ruby version: ruby 1.9.3p0 (2011-10-30) [x86_64-linux]

[frsyuki]

Your understanding is right. The external program reads TSV from stdin and writes TSV to stdout.
I updated the document a little: http://fluentd.org/doc/plugin.html#exec-filter

The error in the test case was caused because the external program took longer time than expected (0.1 seconds). I extended the sleep time to 0.5 seconds.