Rudder

A bug quite similar to #10646 was reported on the same heavy loaded installation, but with a different part of the system failing and that error message:

[2018-08-21 18:35:57] DEBUG com.normation.rudder.services.policies.PromiseGenerationServiceImpl - Policy generation completed in 1124 ms
[2018-08-21 18:35:57] ERROR com.normation.rudder.batch.AsyncDeploymentAgent$DeployerAgent - Error when updating policy, reason Cannot get the Configuration Cache <- Can't execute LDAP request
[2018-08-21 18:35:57] ERROR com.normation.rudder.batch.AsyncDeploymentAgent - Policy update error for process '13637' at 2018-08-21 18:35:57: Cannot get the Configuration Cache
[2018-08-21 18:36:05] INFO  com.normation.rudder.services.policies.PromiseGenerationServiceImpl - Start policy generation, checking updated rules
[2018-08-21 18:36:05] DEBUG com.normation.rudder.services.policies.PromiseGenerationServiceImpl - Pre-policy-generation scripts hooks ran in 4 ms
[2018-08-21 18:36:05] DEBUG com.normation.rudder.services.policies.PromiseGenerationServiceImpl - Pre-policy-generation modules hooks in 0 ms, start getting all generation related data.
[2018-08-21 18:36:06] ERROR com.normation.ldap.sdk.RWPooledSimpleAuthConnectionProvider - Can't execute LDAP request
com.unboundid.ldap.sdk.LDAPSearchException: The connection to server localhost:389 was closed while waiting for a response to search request SearchRequest(baseDN='cn=Nodes Configuration,ou=Rudder,cn=rudder-configuration', scope=BASE, deref=NEVER, sizeLimit=1, time
Limit=0, filter='(objectClass=*)', attrs={}):  An I/O error occurred while trying to read the response from the server:  IOException(message='The element indicated that it required 20972056 bytes to hold the value, but this is larger than the maximum of 20971520 b
ytes that the client has been configured to accept.', trace='readLength(ASN1StreamReader.java:390) / beginSequence(ASN1StreamReader.java:918) / readLDAPResponseFrom(LDAPMessage.java:1146) / run(LDAPConnectionReader.java:251)', revision=24201)

The problem is linked to a default parameter in unboundid: https://docs.ldap.com/ldap-sdk/docs/javadoc/com/unboundid/ldap/sdk/LDAPConnectionOptions.html#PROPERTY_DEFAULT_MAX_MESSAGE_SIZE_BYTES which has a default value of 20971520 B (20MB).