| Summary | Orbixd makes reverse DNS lookups which will slow the system considerably if the DNS is slow to respond or does not respond to requests. |
|---|---|
| Article Number | 31051 |
| Environment | Orbix 3.3.X |
| Question/Problem Description | Orbix server is slow to forward requests. Some orbixd requests take over 10 seconds to respond. |
| Clarifying Information | Symptoms for a DNS issue are:
Looking at a packet capture, orbixd requests which result in location forward operations will be far slower than other orbixd requests.
In the Orbix log files, connections will sometimes include host names and sometimes IP addresses. [ 12:00:00.000 orbixd@server.group.com End of IIOP Connection (10.114.0.9:1570) ]
and [ 12:00:00.000 orbixd@server.group.com End of IIOP Connection (hostname.group.com:1570) ] The ip address is given if the DNS reverse lookup times out. A DTrace of the function gethostbyaddr will show a considerable wait between the entry and exit of the function. |
| Error Message | |
| Defect/Enhancement Number | |
| Cause | The DNS reverse lookup is slow or does not complete, note this is down to an error in how the DNS is configured and not an issue in Orbix. It manifests itself in Orbix as a slow orbixd. |
| Resolution |
Set the orbix configuration variable Orbix.IT_USE_REVERSE_LOOKUP= "NO" IT_USE_REVERSE_LOOKUP configuration variable resolves against the DNS and prints out the hostname. |
| Workaround | |
| Notes | |
| Attachment |
| Created date: | 12 April 2012 |
|---|---|
| Last Modified: | 13 February 2013 |
| Last Published: | 18 May 2012 |
| First Published date: | 18 May 2012 |
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