sourabhaggrawal opened a new issue #11972:
URL: https://github.com/apache/pulsar/issues/11972
**Describe the bug**
We are trying to configure rack-aware policy, when starting pulsar we get
this error at RackAwareEnsemblePlacementPolicyImpl and then it end up using
default-rack as per the logs.
18:10:36.083 [pulsar-ordered-OrderedExecutor-0-0] ERROR
org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicyImpl - Failed to
initialize DNS Resolver
org.apache.pulsar.zookeeper.ZkBookieRackAffinityMapping, used default subnet
resolver : java.lang.RuntimeException: java.lang.NullPointerException
java.lang.NullPointerException
18:10:36.087 [pulsar-ordered-OrderedExecutor-0-0] INFO
org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicyImpl - Initialize
rackaware ensemble placement policy @ <Bookie:192.168.1.7:0> @ /default-rack :
org.apache.bookkeeper.client.TopologyAwareEnsemblePlacementPolicy$DefaultResolver.
**To Reproduce**
Steps to reproduce the behavior:
1. Enable bookkeeperClientRackawarePolicyEnabled in pulsar broker.conf
2. Configure
ensemblePlacementPolicy=org.apache.bookkeeper.client.RackawareEnsemblePlacementPolicy
in bookkeeper.conf
3. configure racks
4. start zookeeper, bookkeeper & pulsar
**Expected behavior**
Expected RackawareEnsemblePlacementPolicyImpl to initialise racks with given
rack info and its bookies as per the implementation of
ZKBookieRackAffinityMapping.
**Screenshots**
If applicable, add screenshots to help explain your problem.
**Desktop (please complete the following information):**
- OS: iOS
- Pulsar 2.8.0
- Bookkeeper 4.14.1
**Additional context**
While troubleshooting we found, during initialisation of
RackAwareEnsemblePlacementPolicy it creates new instance of dnsResolver as
below at line
https://github.com/apache/bookkeeper/blob/97818f5123999396e66f5246420d3c7e3d25f53d/bookkeeper-server/src/main/java/org/apache/bookkeeper/client/RackawareEnsemblePlacementPolicyImpl.java#L262
dnsResolver = ReflectionUtils.newInstance(dnsResolverName,
DNSToSwitchMapping.class);
if (dnsResolver instanceof Configurable) {
((Configurable) dnsResolver).setConf(conf);
}
setConf is then triggered on ZKBookieRackAffinityMapping which throws
NullPointer at
https://github.com/apache/pulsar/blob/89ac98e4af363b09f2fe8e309539b0e35243aaee/pulsar-zookeeper-utils/src/main/java/org/apache/pulsar/zookeeper/ZkBookieRackAffinityMapping.java#L97
while prepare rack with its host information.
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