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https://issues.apache.org/jira/browse/HDFS-17791?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17952979#comment-17952979
]
Carl Vuosalo commented on HDFS-17791:
-------------------------------------
Example of error message produced by the {{libhdfs}} client when trying to open
a non-existent file. Part of the Java stack trace actually appears twice. A
message like this appears in our logs for every "file not found" error.
{code:java}
File we will access:
/store/mc/RunIIISummer24PrePremix/Neutrino_E-10_gun/PREMIX/Premixlib2024_140X_mcRun3_2024_realistic_v26-v1/2520137/a65fd95a-1302-4e95-98a0-e8d4ad856aab.root
hdfsOpenFile(/store/mc/RunIIISummer24PrePremix/Neutrino_E-10_gun/PREMIX/Premixlib2024_140X_mcRun3_2024_realistic_v26-v1/2520137/a65fd95a-1302-4e95-98a0-e8d4ad856aab.root):
FileSystem#open((Lorg/apache/hadoop/fs/Path;I)Lorg/apache/hadoop/fs/FSDataInputStream;)
error:
RemoteException: File does not exist:
/store/mc/RunIIISummer24PrePremix/Neutrino_E-10_gun/PREMIX/Premixlib2024_140X_mcRun3_2024_realistic_v26-v1/2520137/a65fd95a-1302-4e95-98a0-e8d4ad856aab.root
at org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:86)
at org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:76)
at
org.apache.hadoop.hdfs.server.namenode.FSDirStatAndListingOp.getBlockLocations(FSDirStatAndListingOp.java:156)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocations(FSNamesystem.java:2124)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getBlockLocations(NameNodeRpcServer.java:770)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getBlockLocations(ClientNamenodeProtocolServerSideTranslatorPB.java:460)
at
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:621)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:589)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:573)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1227)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1094)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1017)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1899)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:3048)
java.io.FileNotFoundException: File does not exist:
/store/mc/RunIIISummer24PrePremix/Neutrino_E-10_gun/PREMIX/Premixlib2024_140X_mcRun3_2024_realistic_v26-v1/2520137/a65fd95a-1302-4e95-98a0-e8d4ad856aab.root
at org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:86)
at org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:76)
at
org.apache.hadoop.hdfs.server.namenode.FSDirStatAndListingOp.getBlockLocations(FSDirStatAndListingOp.java:156)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocations(FSNamesystem.java:2124)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getBlockLocations(NameNodeRpcServer.java:770)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getBlockLocations(ClientNamenodeProtocolServerSideTranslatorPB.java:460)
at
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:621)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:589)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:573)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1227)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1094)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1017)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1899)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:3048)
at
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native
Method)
at
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at
java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:490)
at
org.apache.hadoop.ipc.RemoteException.instantiateException(RemoteException.java:121)
at
org.apache.hadoop.ipc.RemoteException.unwrapRemoteException(RemoteException.java:88)
at org.apache.hadoop.hdfs.DFSClient.callGetBlockLocations(DFSClient.java:902)
at org.apache.hadoop.hdfs.DFSClient.getLocatedBlocks(DFSClient.java:889)
at org.apache.hadoop.hdfs.DFSClient.getLocatedBlocks(DFSClient.java:878)
at org.apache.hadoop.hdfs.DFSClient.open(DFSClient.java:1046)
at
org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:343)
at
org.apache.hadoop.hdfs.DistributedFileSystem$4.doCall(DistributedFileSystem.java:339)
at
org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
at
org.apache.hadoop.hdfs.DistributedFileSystem.open(DistributedFileSystem.java:356)
Caused by:
org.apache.hadoop.ipc.RemoteException(java.io.FileNotFoundException): File does
not exist:
/store/mc/RunIIISummer24PrePremix/Neutrino_E-10_gun/PREMIX/Premixlib2024_140X_mcRun3_2024_realistic_v26-v1/2520137/a65fd95a-1302-4e95-98a0-e8d4ad856aab.root
at org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:86)
at org.apache.hadoop.hdfs.server.namenode.INodeFile.valueOf(INodeFile.java:76)
at
org.apache.hadoop.hdfs.server.namenode.FSDirStatAndListingOp.getBlockLocations(FSDirStatAndListingOp.java:156)
at
org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getBlockLocations(FSNamesystem.java:2124)
at
org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.getBlockLocations(NameNodeRpcServer.java:770)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.getBlockLocations(ClientNamenodeProtocolServerSideTranslatorPB.java:460)
at
org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:621)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:589)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:573)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1227)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1094)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1017)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.base/javax.security.auth.Subject.doAs(Subject.java:423)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1899)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:3048)
at org.apache.hadoop.ipc.Client.getRpcResponse(Client.java:1567)
at org.apache.hadoop.ipc.Client.call(Client.java:1513)
at org.apache.hadoop.ipc.Client.call(Client.java:1410)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.invoke(ProtobufRpcEngine2.java:258)
at
org.apache.hadoop.ipc.ProtobufRpcEngine2$Invoker.invoke(ProtobufRpcEngine2.java:139)
at com.sun.proxy.$Proxy12.getBlockLocations(Unknown Source)
at
org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getBlockLocations(ClientNamenodeProtocolTranslatorPB.java:334)
at jdk.internal.reflect.GeneratedMethodAccessor2.invoke(Unknown Source)
at
java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:433)
at
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeMethod(RetryInvocationHandler.java:166)
at
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invoke(RetryInvocationHandler.java:158)
at
org.apache.hadoop.io.retry.RetryInvocationHandler$Call.invokeOnce(RetryInvocationHandler.java:96)
at
org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:362)
at com.sun.proxy.$Proxy13.getBlockLocations(Unknown Source)
at org.apache.hadoop.hdfs.DFSClient.callGetBlockLocations(DFSClient.java:900)
... 7 more
{code}
> libhdfs client error message for "file not found" includes lengthy, unneeded
> stack trace
> ----------------------------------------------------------------------------------------
>
> Key: HDFS-17791
> URL: https://issues.apache.org/jira/browse/HDFS-17791
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: libhdfs
> Affects Versions: 3.3.6
> Reporter: Carl Vuosalo
> Priority: Minor
>
> The {{libhdfs}} client outputs a full Java stack trace in its error message
> for a "file not found" error when trying to open a non-existent file. Our
> HDFS application processes numerous queries checking for the presence of
> files, so "file not found" errors are frequent. Each such error generates a
> very lengthy and useless Java stack trace. These traces have no diagnostic
> value, since the cause of the error is that the file doesn't exist.
> A fix for this problem is proposed by pull request
> [#7696|https://github.com/apache/hadoop/pull/7696],
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