[HDFS-16923] The getListing RPC will throw NPE if the path does not exist

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 3.4.0, 3.3.5
• Fix Version/s: 3.4.0, 3.3.5
• Component/s: namenode
• Labels: pull-request-available
• Target Version/s: 3.4.0, 3.3.5
• Hadoop Flags: Reviewed
• Assignee: ZanderXu
• Reporter: ZanderXu
• Created: 15/Feb/23 10:41
• Updated: 28/Jan/24 07:18
• Resolved: 02/Mar/23 00:24

Description

The getListing RPC will throw NPE if the path does not exist. And the stack as bellow:

org.apache.hadoop.ipc.RemoteException(org.apache.hadoop.ipc.RemoteException): org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException): java.lang.NullPointerException
    at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getListing(FSNamesystem.java:4195)
    at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getListing(NameNodeRpcServer.java:1421)
    at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getListing(ClientNamenodeProtocolServerSideTranslatorPB.java:783)
    at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:622)
    at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:590)
    at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:574) 

Issue Links

• is caused by: HDFS-16732 [SBN READ] Avoid get location from observer when the block report is delayed.
• links to: GitHub Pull Request #5400