FileInstaller spawns multiple watchers for same directory
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Key: FELIX-1036
URL: https://issues.apache.org/jira/browse/FELIX-1036
Project: Felix
Issue Type: Bug
Environment: Felix 1.6.0, fileinstall 0.9.2, configadmin 1.0.10
Reporter: Sahoo
I am running into a strange issue and I don't know if it has to do with any bad
use in my part. I am using fileinstall to monitor two directories. fileinstall
is configured using config.properties file to monitor a dir called
/space/ss141213/software/felix-1.6.0/bundle. I have a cfg file in modules dir
that configures fileinstall to monitor a second dir called /tmp/bundles. During
subsequent start of the framework, I see fileinstall spwaning more than one
watchers for the second dir as shown in the jstack output below:
"{felix.fileinstall.dir=/space/ss141213/software/felix-1.6.0/bundle,
felix.fileinstall.debug=1}" daemon prio=3 tid=0x0833fc00 nid=0xd waiting on
condition [0xcbaea000..0xcbaeaae0]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at
org.apache.felix.fileinstall.DirectoryWatcher.run(DirectoryWatcher.java:122)
"{service.pid=org.apache.felix.fileinstall.bd775a2e-9ed9-41e4-8159-83295f3aaefa,
felix.fileinstall.dir=/tmp/bundles,
service.factorypid=org.apache.felix.fileinstall, felix.fileinstall.debug=1}"
daemon prio=3 tid=0x083a5800 nid=0x13 waiting on condition
[0xcb7ad000..0xcb7adbe0]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at
org.apache.felix.fileinstall.DirectoryWatcher.run(DirectoryWatcher.java:122)
"{service.pid=org.apache.felix.fileinstall.2aac2209-96d0-4dcb-8e33-ac3f6fbf2856,
felix.fileinstall.dir=/tmp/bundles,
service.factorypid=org.apache.felix.fileinstall, felix.fileinstall.debug=1}"
daemon prio=3 tid=0x08387800 nid=0x12 waiting on condition
[0xcb927000..0xcb927a60]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at
org.apache.felix.fileinstall.DirectoryWatcher.run(DirectoryWatcher.java:122)
"{service.pid=org.apache.felix.fileinstall.8997ded4-b1de-46bb-b675-4166734eea73,
felix.fileinstall.dir=/tmp/bundles,
service.factorypid=org.apache.felix.fileinstall, felix.fileinstall.debug=1}"
daemon prio=3 tid=0x0838a000 nid=0x11 waiting on condition
[0xcb979000..0xcb9798e0]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at
org.apache.felix.fileinstall.DirectoryWatcher.run(DirectoryWatcher.java:122)
"{service.pid=org.apache.felix.fileinstall.15c95057-a0f9-4269-b827-44df4fa23f6b,
felix.fileinstall.dir=/tmp/bundles,
service.factorypid=org.apache.felix.fileinstall, felix.fileinstall.debug=1}"
daemon prio=3 tid=0x0838c800 nid=0x10 waiting on condition
[0xcb9cb000..0xcb9cb960]
java.lang.Thread.State: TIMED_WAITING (sleeping)
at java.lang.Thread.sleep(Native Method)
at
org.apache.felix.fileinstall.DirectoryWatcher.run(DirectoryWatcher.java:122)
The funny thing is the number keeps increasing by one more for every subsequent
restart.
I see that as part of initial configuration, fileinstall spwans a directory
watcher for modules dir, as this is configured using config.properties. Then
that directorywatcher spawns a second one after it discovers the cfg file in
modules dir. At the same time, configuration manager also notifies
fileinstaller based on what appears to be its cached values.
It is very easy to reproduce. In a standard felix installation, drop
fileinstall bundle alonng with configurationmanager bundle into bundle dir. Add
it to the auto.start list. Add a cfg file with an entry:
felix.fileinstall.dir=/tmp/bundles. Now start Felix. This time you shall see
only thread for /tmp/bundles. Restart Felix, now you shall see two threads for
that dir. Restart again to see three threads and it continues. If you clean the
cache, it goes back to one thread.
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