Conference azur::mcc

1150.0. "DNS problems on lookup domains" by UTRUST::KUIJPER (Are you being served ?) Mon Jun 17 1991 03:45

Hi,

Lately I am observing some very strange DNS problems with DECmcc.
Lookup's on domains sometimes work, sometimes do not work.
I will include a log below.

I am running my own private namespace on the management station,
no replica's of clearinghouses on other systems.
I have tried alreday to rebuild the DNS with the REBUILD command but to
no avail.

If I do a wildcard show ( MCC> SHOW DOMAIN * ALL IDENTIFIERS) I get the
error message:
	MCC Routine Error = %MCC-E-NOATTRIB, no such DNS attribute

Any suggestion/help is welcome, since the only alternative I see is to 
recreate the namespace and reregister the entities contained within.

Regards,
Frank Kuijper, IT/ACT The Netherlands.

Extract from logfile:
---------------------
$ mc dns$control
DNS> show object world kn attr
 Attribute (Set) ______ DNS$ACS
 Attribute (Single) ___ DNS$Class
 Attribute (Single) ___ DNS$ClassVersion
 Attribute (Set) ______ DNS$MEMBERS
 Attribute (Single) ___ DNS$UID
 Attribute (Single) ___ DNS$UTS
 Attribute (Set) ______ MCC_Class
 Attribute (Set) ______ MCC_DOM_EXT_LIST
 Attribute (Single) ___ MCC_DOM_EXT_NEXT
 Attribute (Single) ___ MCC_DOM_MEM_CUR
 Attribute (Single) ___ MCC_DOM_MEM_MAX
 Attribute (Set) ______ MCC_DOMAIN_LIST
 Attribute (Single) ___ MCC_UID
 Attribute (Set) ______ MCC_Version

DNS> show object world attr MCC_Class
  Member _ 0 
            (Hexadecimal): 
 08 00 00 00
            (ASCII and Hexadecimal): 
 08 00 00 00
  Timestamp _ 10-MAY-1991 18:41:30.62 aa-00-04-00-ac-c8

DNS> show object world attr MCC_DOM_EXT_LIST
  Member _ 0 
            (Hexadecimal): 
 aa 00 04 00 ac c8 a0 39 67 50 28 20 94 00 14 00 01 10 57 4f 52 4c 44 5f
 4d 43 43 5f 45 58 54 30 30 30 00 00
            (ASCII and Hexadecimal): 
 � 00 04 00 � � � 9 g P (   94 00 14 00 01 10 W O R L D _ M C C _
 E X T 0 0 0 00 00
  Timestamp _ 10-MAY-1991 18:41:29.85 aa-00-04-00-ac-c8

DNS> show object world attr MCC_DOM_EXT_NEXT
  Member _ 0 
            (Hexadecimal): 
 01 00 00 00
            (ASCII and Hexadecimal): 
 01 00 00 00
  Timestamp _ 10-MAY-1991 18:41:30.10 aa-00-04-00-ac-c8

DNS> show object world attr MCC_DOM_MEM_CUR
  Member _ 0 
            (Hexadecimal): 
 05 00 00 00
            (ASCII and Hexadecimal): 
 05 00 00 00
  Timestamp _ 10-MAY-1991 19:03:00.52 aa-00-04-00-ac-c8

DNS> show object world attr MCC_DOM_MEM_MAX
  Member _ 0 
            (Hexadecimal): 
 0a 00 00 00
            (ASCII and Hexadecimal): 
 0a 00 00 00
  Timestamp _ 10-MAY-1991 18:41:27.58 aa-00-04-00-ac-c8

DNS> show object world attr MCC_DOMAIN_LIST
  Member _ 0 
            (Hexadecimal): 
 aa 00 04 00 ac c8 a0 39 67 50 28 20 94 00 0c 00 01 08 4f 56 45 52
 56 49 45 57 00 00
            (ASCII and Hexadecimal): 
 � 00 04 00 � � � 9 g P (   94 00 0c 00 01 08 O
 V E R V I E W 00 00
  Timestamp _ 30-MAY-1991 15:42:13.22 aa-00-04-00-ac-c8

DNS> show object world attr MCC_Version
  Member _ 0 
            (Hexadecimal): 
 a6 82 00 08 9f 81 7d 04 56 01 01 00
            (ASCII and Hexadecimal): 
 � 82 00 08 9f 81 } 04 V 01 01 00
  Timestamp _ 10-MAY-1991 18:41:30.36 aa-00-04-00-ac-c8

DNS> show object world attr MCC_UID
  Member _ 0 
            (Hexadecimal): 
 c0 e2 a3 db e9 0e ca 01 00 00 aa 00 04 00 ac c8
            (ASCII and Hexadecimal): 
 � � � � � 0e � 01 00 00 � 00 04 00 � �
  Timestamp _ 10-MAY-1991 18:41:31.11 aa-00-04-00-ac-c8

DNS> EXIT

$ mana /enter
DECmcc (V1.1.0)

MCC> show domain world all attr
Domain MCC_UTO:.world 
AT 17-JUN-1991 09:24:36 All Attributes
No such entity: Domain MCC_UTO:.world 
                         Unknown Entity = Domain MCC_UTO:.world 

MCC> show domain world all iden
Domain MCC_UTO:.world 
AT 17-JUN-1991 09:24:43 Identifiers
No such entity: Domain MCC_UTO:.world 
                         Unknown Entity = Domain MCC_UTO:.world 

MCC> show domain world
Using default ALL IDENTIFIERS
Domain MCC_UTO:.world 
AT 17-JUN-1991 09:24:51 Identifiers
Examination of attributes shows
                             DomainName = MCC_UTO:.world

MCC> show domain world
Using default ALL IDENTIFIERS
Domain MCC_UTO:.world 
AT 17-JUN-1991 09:24:56 Identifiers
No such entity: Domain MCC_UTO:.world 
                         Unknown Entity = Domain MCC_UTO:.world 

MCC> EXIT

Rebuild the DNS directory doesn't help when the is only one 
clearhinghouse, hence only one directory replica.  

Are you sure that there is only one copy of the root directory?
Please insert a DNS> SHOW CHAR DIR .     If there are multiple
clearinghouses with dir . and they have mismatched timeszones
or time out of synchronization then you will get that error.
The reason it works sometimes is because the client rotates
though its cache of know servers and picks a good server, then
a bad server.   

/Claudia

RE: -1

That did it, although not the first time.
What happened was the following:

A while back I had a copy of the root directory on another system, and due to 
various reasons I decided to set the convergence to LOW.
About a week ago, I removed the readonly clearinghouse, but left the
convergence to LOW. So far, so good.
However, my MCC station/DNS space is set up in a way that nodes belonging to
different groups are in seperate directories (eg .ACT.node, .UTO.node etc.)
and I started experimenting with moving this entries to seperate clearing-
houses. Here is where I did wrong. The new clearinghouses turned out to be
a copy of the root directory instead of just the .ACT or .UTO.
Probably with the convergence LOW that gave the problems.

The DNS> SHOW CHAR DIR . after a few tries revailed the fact that there
were multiple copies. After stopping and deleting the newly created
clearinghouses, everything is back to normal again.

So thanks a lot for your help.
Regards,
Frank Kuijper