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From "Sahoo (JIRA)" <j...@apache.org>
Subject [jira] Commented: (FELIX-1036) FileInstaller spawns multiple watchers for same directory
Date Thu, 16 Apr 2009 15:16:14 GMT

    [ https://issues.apache.org/jira/browse/FELIX-1036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699726#action_12699726
] 

Sahoo commented on FELIX-1036:
------------------------------

Looks like I missed the line "Updating configuration from org.apache.felix.fileinstall-autodeploy-modules.cfg."
So the second output is expected. So, the patch works for me. 


> FileInstaller spawns multiple watchers for same directory
> ---------------------------------------------------------
>
>                 Key: FELIX-1036
>                 URL: https://issues.apache.org/jira/browse/FELIX-1036
>             Project: Felix
>          Issue Type: Bug
>          Components: File Install
>    Affects Versions: fileinstall-0.9.2
>         Environment: Felix 1.6.0, fileinstall 0.9.2, configadmin 1.0.10
>            Reporter: Sahoo
>         Attachments: FELIX-1036.patch
>
>
> 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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