Hean-Chhinling commented on code in PR #8222:
URL: https://github.com/apache/hadoop/pull/8222#discussion_r2753332261
##########
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/conf/ZKConfigurationStore.java:
##########
@@ -263,10 +264,46 @@ private boolean createNewZkPath(String path) throws
Exception {
}
}
+ /*
@VisibleForTesting
protected byte[] getZkData(String path) throws Exception {
return zkManager.getData(path);
}
+*/
+
+ @VisibleForTesting
+ protected byte[] getZkData(String path) throws Exception {
+ // Should a 'yarn resourcemanager -format-state-store' command is issued
+ // while one of the RM is in a starting state, there is a time period
+ // when the /confstore/CONF_STORE path does not exist, hence the
Review Comment:
I think there are different states of failures:
- When another RM format the conf-store and then Node is not exists, it will
throw the following errors which you already addressed.
```
2026-01-23 00:10:45,594 ERROR
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.conf.ZKConfigurationStore:
Failed to retrieve configuration from zookeeper store
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode =
NoNode for /confstore/CONF_STORE
```
- When another RM access the conf-store while another RM has not finished
written data to the conf-store. It will throw the following error. The
conf-store node exists but the data has fully written yet otherwise it will
throw the above NoNode for CONF_STORE.
```
2026-01-26 06:08:40,268 ERROR
org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.conf.ZKConfigurationStore:
Exception while deserializing scheduler configuration from store
java.lang.NullPointerException
```
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