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https://issues.apache.org/jira/browse/HDFS-15998?focusedWorklogId=601007&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-601007
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ASF GitHub Bot logged work on HDFS-15998:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 24/May/21 04:20
Start Date: 24/May/21 04:20
Worklog Time Spent: 10m
Work Description: haiyang1987 commented on pull request #3036:
URL: https://github.com/apache/hadoop/pull/3036#issuecomment-846720962
@jojochuang Thanks for comments. Later, I'll try to add a unit tests.
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Issue Time Tracking
-------------------
Worklog Id: (was: 601007)
Time Spent: 50m (was: 40m)
> Fix NullPointException In listOpenFiles
> ---------------------------------------
>
> Key: HDFS-15998
> URL: https://issues.apache.org/jira/browse/HDFS-15998
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 3.2.0
> Reporter: Haiyang Hu
> Assignee: Haiyang Hu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Use the Hadoop 3.2.0 client execute the following command: occasionally throw
> NPE.
> hdfs dfsadmin -Dfs.defaultFS=hdfs://xxx -listOpenFiles -blockingDecommission
> -path /xxx
>
> {quote}
> org.apache.hadoop.ipc.RemoteException(java.lang.NullPointerException):
> java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getFilesBlockingDecom(FSNamesystem.java:1917)
> at
> org.apache.hadoop.hdfs.server.namenode.FSNamesystem.listOpenFiles(FSNamesystem.java:1876)
> at
> org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.listOpenFiles(NameNodeRpcServer.java:1453)
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.listOpenFiles(ClientNamenodeProtocolServerSideTranslatorPB.java:1894)
> at
> org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> ...
> at
> org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.listOpenFiles(ClientNamenodeProtocolTranslatorPB.java:1952)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> at java.lang.reflect.Method.invoke(Method.java:498)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:422)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:165)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:157)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:95)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:359)
> at com.sun.proxy.$Proxy10.listOpenFiles(Unknown Source)
> at
> org.apache.hadoop.hdfs.protocol.OpenFilesIterator.makeRequest(OpenFilesIterator.java:89)
> at
> org.apache.hadoop.hdfs.protocol.OpenFilesIterator.makeRequest(OpenFilesIterator.java:35)
> at
> org.apache.hadoop.fs.BatchedRemoteIterator.makeRequest(BatchedRemoteIterator.java:77)
> at
> org.apache.hadoop.fs.BatchedRemoteIterator.makeRequestIfNeeded(BatchedRemoteIterator.java:85)
> at
> org.apache.hadoop.fs.BatchedRemoteIterator.hasNext(BatchedRemoteIterator.java:99)
> at
> org.apache.hadoop.hdfs.tools.DFSAdmin.printOpenFiles(DFSAdmin.java:1006)
> at
> org.apache.hadoop.hdfs.tools.DFSAdmin.listOpenFiles(DFSAdmin.java:994)
> at org.apache.hadoop.hdfs.tools.DFSAdmin.run(DFSAdmin.java:2431)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
> at org.apache.hadoop.hdfs.tools.DFSAdmin.main(DFSAdmin.java:2590)
> List open files failed.
> listOpenFiles: java.lang.NullPointerException
> {quote}
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