Re: [Shoal-Dev] About HealthMonitor's cache

From: Bongjae Chang <carryel_at_korea.com>
Date: Fri, 3 Jul 2009 23:24:58 +0900

Hi,

When I look into the HealthMonitor simply, there is no cache.remove() and clear().

I just would like to know whether this is on purpose or not.

If not, and if I will find a better idea before Monday, I will reply again.

Thanks.

--
Bongjae Chang

  ----- Original Message -----
  From: Shreedhar Ganapathy
  To: dev_at_shoal.dev.java.net
  Sent: Friday, July 03, 2009 10:26 PM
  Subject: Re: [Shoal-Dev] About HealthMonitor's cache

  I noticed that as well. We need to check to see why the health cache is not cleared once the failure of a member is verified.

  It's a holiday here in US. We'll need to look into it on Monday once Joe's back.

  Let us know if you find something in the meantime.

  On 03-Jul-2009, at 5:54 AM, Bongjae Chang <carryel_at_korea.com> wrote:

    Hi,

    HealthMonitor stores the cache with members' states.

    But if a member's state was stored once, the value would be never removed.

    Assume that A was the group' member and now A is still failed.

    Then, we can see the following FINE level's log continuously.

    --
    [#|2009-07-03T21:42:45.930+0900|FINE|Shoal|ShoalLogger|_ThreadID=30;_ThreadName=InDoubtPeerDetector
    Thread for Group:test;ClassName=HealthMonitor$InDoubtPeerDetector;MethodName=processCacheUpdate;|pro
    cessCacheUpdate : A 's state is dead|#]

    [#|2009-07-03T21:42:48.930+0900|FINE|Shoal|ShoalLogger|_ThreadID=30;_ThreadName=InDoubtPeerDetector
    Thread for Group:test;ClassName=HealthMonitor$InDoubtPeerDetector;MethodName=processCacheUpdate;|pro
    cessCacheUpdate : A 's state is dead|#]

    [#|2009-07-03T21:42:51.930+0900|FINE|Shoal|ShoalLogger|_ThreadID=30;_ThreadName=InDoubtPeerDetector
    Thread for Group:test;ClassName=HealthMonitor$InDoubtPeerDetector;MethodName=processCacheUpdate;|pro
    cessCacheUpdate : A 's state is dead|#]

    [#|2009-07-03T21:42:54.930+0900|FINE|Shoal|ShoalLogger|_ThreadID=30;_ThreadName=InDoubtPeerDetector
    Thread for Group:test;ClassName=HealthMonitor$InDoubtPeerDetector;MethodName=processCacheUpdate;|pro
    cessCacheUpdate : A 's state is dead|#]

    [#|2009-07-03T21:42:57.930+0900|FINE|Shoal|ShoalLogger|_ThreadID=30;_ThreadName=InDoubtPeerDetector
    Thread for Group:test;ClassName=HealthMonitor$InDoubtPeerDetector;MethodName=processCacheUpdate;|pro
    cessCacheUpdate : A 's state is dead|#]

    [#|2009-07-03T21:43:00.945+0900|FINE|Shoal|ShoalLogger|_ThreadID=30;_ThreadName=InDoubtPeerDetector
    Thread for Group:test;ClassName=HealthMonitor$InDoubtPeerDetector;MethodName=processCacheUpdate;|pro
    cessCacheUpdate : A 's state is dead|#]
    --

    Is this expected for monitoring old member's state or members' history?

    Please advice me.

    Thanks.

    --
    Bongjae Chang