[HDFS-16207] Remove NN logs stack trace for non-existent xattr query

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.4.0, 2.10.2, 3.3.2, 3.2.4
• Fix Version/s: 3.4.0, 2.10.2, 3.3.2, 3.2.4
• Component/s: namenode
• Labels: pull-request-available
• Assignee: Ahmed Hussein
• Reporter: Ahmed Hussein
• Created: 02/Sep/21 19:31
• Updated: 09/Sep/21 22:02
• Resolved: 09/Sep/21 22:02

Description

The NN logs a full stack trace every time a getXAttrs is called for a non-existent xattr. The logging has zero value add. The increased logging load may harm performance. Something is now probing for xattrs resulting in many lines of:

2021-09-02 13:48:03,340 [IPC Server handler 5 on default port 59951] INFO  ipc.Server (Server.java:logException(3149)) - IPC Server handler 5 on default port 59951, call Call#17 Retry#0 org.apache.hadoop.hdfs.protocol.ClientProtocol.getXAttrs from 127.0.0.1:59961
java.io.IOException: At least one of the attributes provided was not found.
	at org.apache.hadoop.hdfs.server.namenode.FSDirXAttrOp.getXAttrs(FSDirXAttrOp.java:134)
	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getXAttrs(FSNamesystem.java:8472)
	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getXAttrs(NameNodeRpcServer.java:2317)
	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getXAttrs(ClientNamenodeProtocolServerSideTranslatorPB.java:1745)
	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
	at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:604)
	at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:572)
	at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:556)
	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1093)
	at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1155)
	at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1083)
	at java.security.AccessController.doPrivileged(Native Method)
	at javax.security.auth.Subject.doAs(Subject.java:422)
	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1900)
	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:3088)

Issue Links

• links to: GitHub Pull Request #3375