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Re: Really strange data corruption. Anyone seen this before ?

Hi. I was just keen to know more about this problem. Also, I am also trying to perform a similar tests myself to see some rough performance, though I have my mine built on Linux. Do you have any numbers that you could share.
Your help would be appreciated.


From: Paul Duffy <paduffy@cisco.com>
To: openldap-software@OpenLDAP.org
Subject: Really strange data corruption.  Anyone seen this before ?
Date: Fri, 19 Jan 2001 17:29:37 -0500

OpenLDAP 2.07 built with gcc 2.95.2 for Solaris 2.6

Simple flat-ish tree structure was loaded with 10,000 objects via ldapadd
and an LDIF file.  Loaded without problem.  Several test queries operated
just fine.

Each of these objects contained a "key" attribute that was indexed for fast
lookup, and a second attribute that carried the object's "payload" - a 3K
text string.

Now we start up a test client that sequentially fetches the objects and
parses the text attribute.  6 of the 10000 objects fails the
parse.  Further investigation reveals that these 6 parse failures were due
to a single garbage character placed in the text string.  This was verified
both via the test client and ldapsearch tool.  These garbage characters
were not in the LDIF file (the same LDIF file was used with Netscape DS
without this problem).

So it appears that, somehow, these few characters on a few objects were
mangled within the OpenLDAP server.

It gets stranger...

Deleting all 10,000 objects and reloading makes the problem go away.

Weird, very weird.

Thoughts ?

********************************************************* Paul B Duffy paduffy@cisco.com Cisco Systems, Inc. ********************************************************

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