[KARAF-1218] Only use 1 thread for file installer watcher

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Won't Fix
• Affects Version/s: 2.2.5
• Assignee: Unassigned
• Reporter: Claus Ibsen
• Created: 22/Feb/12 14:46
• Updated: 22/Nov/17 14:02
• Resolved: 22/Nov/17 14:02

Description

When running Apache Karaf 2.2.5 then we want to run it with as low overhead as possible. Out of the box it has around 30+ live threads running, which is a fair bit.

We should try to consolidate if applicable. For example there is 2 separate threads for picking up file installer. This can be implemented as a single thread instead.

"fileinstall-/opt/apache-karaf-2.2.5/deploy" daemon prio=5 tid=7fa0cc26d800 nid=0x1104ec000 in Object.wait() [1104eb000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <7e0690610> (a org.apache.felix.fileinstall.internal.DirectoryWatcher)
	at org.apache.felix.fileinstall.internal.DirectoryWatcher.run(DirectoryWatcher.java:268)
	- locked <7e0690610> (a org.apache.felix.fileinstall.internal.DirectoryWatcher)

"fileinstall-/opt/apache-karaf-2.2.5/etc" daemon prio=5 tid=7fa0cc26a800 nid=0x1103e9000 in Object.wait() [1103e8000]
   java.lang.Thread.State: TIMED_WAITING (on object monitor)
	at java.lang.Object.wait(Native Method)
	- waiting on <7e068e778> (a org.apache.felix.fileinstall.internal.DirectoryWatcher)
	at org.apache.felix.fileinstall.internal.DirectoryWatcher.run(DirectoryWatcher.java:268)
	- locked <7e068e778> (a org.apache.felix.fileinstall.internal.DirectoryWatcher)

Those 2 thread should be a single thread, that just watches the 2 directories.