Forum Discussion

hill_t's avatar
hill_t
New Contributor
9 years ago

Setting for endpoint dns cache

Is there any way to control the dns cache settings for Load UI tests?  The issue is when testing with network changes going on we want to ensure that requests do not continue to go to one server if i...
  • hill_t's avatar
    hill_t
    9 years ago

    We found a solution to this issue so I wanted to post it here in case someone else was searching for something similar and found my post.

     

    Changed the value of networkaddress.cache.ttl property in java.security from -1 to 0. This property indicates how many seconds to cache the most recent successful lookup. A value of -1 means to "cache forever" and a 0 means "never cache".

DmitryAleshin's avatar
DmitryAleshin
Staff

LoadUI part is not controlling any system caches in any way.

In general it's not clear how dns could be related with availability of the server. 

You could use IP addresses and forget dns. But i think dns is not a real bottleneck in your situation. 

hill_t's avatar
hill_t
New Contributor
9 years ago

We are doing a test where one set of servers is taken offline and we should start using the other set of servers that is still available.  New tests initiated at that point will correctly go to the set of servers still online but tests already running do not appear to query the dns again and continue to go to the old servers.  I was looking for a way to force it to query the dns at a more frequent interval.

  • DmitryAleshin's avatar
    DmitryAleshin
    Staff
    9 years ago

    Are you using the same set of names for old and new server set? What about addresses? Are they the same and unique from session to session? I mean could you just check an IP of the first set in order to switch to another one if first one became unavailable?

    • hill_t's avatar
      hill_t
      New Contributor
      9 years ago

      Yes, we could do something like that where we try and IP and if it is not available to we try another.  However, part of the point of this test is to make sure we are redirected correctly when one set of servers is taken offline.  So doing something within our tests would really defeat the purpose in this case.

      • hill_t's avatar
        hill_t
        New Contributor
        9 years ago

        We found a solution to this issue so I wanted to post it here in case someone else was searching for something similar and found my post.

         

        Changed the value of networkaddress.cache.ttl property in java.security from -1 to 0. This property indicates how many seconds to cache the most recent successful lookup. A value of -1 means to "cache forever" and a 0 means "never cache".