bianqi created HDFS-15226:
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Summary: Ranger integrates HDFS and discovers NPE
Key: HDFS-15226
URL: https://issues.apache.org/jira/browse/HDFS-15226
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs
Affects Versions: 2.7.6
Environment: Apache Ranger1.2 && Hadoop2.7.6
Reporter: bianqi
Fix For: 3.2.1, 3.2.0
Attachments: image-2020-03-16-14-01-03-078.png
When I integrated ranger1.2 with Hadoop2.7.6, the following NPE error
occurred when executing hdfs dfs -ls /.
However, when I integrated ranger1.2 with Hadoop2.7.1, executing hdfs dfs
-ls / without any errors, and the directory list can be displayed normally.
{quote}java.lang.NullPointerException
at java.lang.String.checkBounds(String.java:384)
at java.lang.String.<init>(String.java:425)
at org.apache.hadoop.hdfs.DFSUtil.bytes2String(DFSUtil.java:337)
at org.apache.hadoop.hdfs.DFSUtil.bytes2String(DFSUtil.java:319)
at
org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.getINodeAttrs(FSPermissionChecker.java:238)
at
org.apache.hadoop.hdfs.server.namenode.FSPermissionChecker.checkPermission(FSPermissionChecker.java:183)
at
org.apache.hadoop.hdfs.server.namenode.FSDirectory.checkPermission(FSDirectory.java:1752)
at
org.apache.hadoop.hdfs.server.namenode.FSDirStatAndListingOp.getFileInfo(FSDirStatAndListingOp.java:100)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getFileInfo(FSNamesystem.java:3832)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getFileInfo(NameNodeRpcServer.java:1012)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getFileInfo(ClientNamenodeProtocolServerSideTranslatorPB.java:855)
at
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:616)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:982)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2217)
at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2213)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1758)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2213)
DEBUG org.apache.hadoop.ipc.Server: IPC Server handler 1 on 8020: responding to
org.apache.hadoop.hdfs.protocol.ClientProtocol.getFileInfo from xxxxxx:8502
Call#0 Retry#0{quote}
When I checked the HDFS source code, I compared hadoop2.7.1 and
hadoop2.7.6 and found that 2.7.6 added the following methods
!image-2020-03-16-14-01-03-078.png|thumbnail!
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