Description
@paulhammond reported this issue at howeyc/fsnotify#62
A temporary workaround is to add your folder(s) to the Spotlight Privacy settings.
It looks like the extra update update is being caused by mds (the daemon responsible for updating the file metadata used by spotlight). See lines 6 onwards from the output of fs_usage, which shows the name of any process performing file operations:
$ sudo fs_usage | grep TestFsnotifyAttrib.testfile 11:46:35 open _test/TestFsnotifyAttrib.testfile 0.000065 fsnotify.tes 11:46:35 lstat64 _test/TestFsnotifyAttrib.testfile 0.000010 fsnotify.tes 11:46:35 open _test/TestFsnotifyAttrib.testf 68B9 ile 0.000009 fsnotify.tes 11:46:35 chmod _test/TestFsnotifyAttrib.testfile 0.000024 fsnotify.tes 11:46:35 access /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000008 dbfseventsd 11:46:35 getattrlist /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000192 mds 11:46:35 lstat64 /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000018 mdworker 11:46:35 stat64 /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000013 mdworker 11:46:35 lstat64 /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000009 mdworker 11:46:35 getattrlist /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000116 mdworker 11:46:35 open /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000024 mdworker 11:46:35 getattrlist /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000041 mdworker 11:46:35 getattrlist /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000116 mdworker 11:46:35 getattrlist go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile/.DS_Store 0.000009 mdworker 11:46:35 getattrlist go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile/.DS_Store 0.000006 mdworker 11:46:35 getattrlist go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile/.DS_Store 0.000005 mdworker 11:46:35 getattrlist go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile/.DS_Store 0.000005 mdworker 11:46:35 getattrlist /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000024 mds 11:46:35 getattrlist /Users/ph/go/src/github.com/howeyc/fsnotify/_test/TestFsnotifyAttrib.testfile 0.000010 mds 11:46:35 unlink _test/TestFsnotifyAttrib.testfile 0.000131 fsnotify.tes(It's also worth noting that this test case consistently passes as of 2c4a662, because mds ignores temporary directories. But the problem is still there.)
I tried implementing throttling but found it ineffective. Spotlight will sometimes touch several files, whereas the throttling was for multiple events on the same file. At the time I tried this, NOTE_ATTRIB would trigger Write events, so it may be worth another shot (as of a100b1a).
Hopefully Spotlight will behave better with FSEvents #11.