Slapd_poll(188) timed out

Question

I'm getting the following error randomly in my error logs:
- DEBUG - conn=-1 op=-1 msgId=-1 - slapd_poll(188) timed out
what does this error mean?
Also when I go to Directory Server > Resource Usages from dscc, I see lot of threads with State: Blocking (reading socket), Bound As: (Not Bound) and Initiated 1, Completed 0.
Are these some sort of hanging threads?
Edited by: DJ on Sep 12, 2012 1:11 AM

Answer 1

Hello,
You can get the slapd poll message when:
1) The LDAP server tries to send data back to the client and block for more than the ioblocktimeout
2) The LDAP server tries to read a PDU from the client and block for more than the ioblocktimeout
either because:
2a) it receives the first byte of the PDU and wait for the end of it
2b) You got SSL handcheck and wait for the first byte of the user PDU
You typically fall into #1 by doing an ldapsearch ... (objectclass=*) | more and wait enough time ...
2a) occurs if there is problem with the application or the network
2b) occurs with some ldap applications ( usually java written because the LDAP C SDK does not exhibut the pb) that open ssl connection then wait before sending first ldap operation ...
a work-around is to have the application send a dummy operation when opening the connection ...
HTH
-Sylvain