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Date: Wed, 9 Nov 2016 02:03:58 +0000 (UTC)
From: "Manoj Govindassamy (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Assigned] (HDFS-5692) viewfs shows resolved path in
 FileNotFoundException
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archived-at: Wed, 09 Nov 2016 02:04:05 -0000


     [ https://issues.apache.org/jira/browse/HDFS-5692?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Manoj Govindassamy reassigned HDFS-5692:
----------------------------------------

    Assignee: Manoj Govindassamy

> viewfs shows resolved path in FileNotFoundException
> ---------------------------------------------------
>
>                 Key: HDFS-5692
>                 URL: https://issues.apache.org/jira/browse/HDFS-5692
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs-client
>    Affects Versions: 2.2.0
>            Reporter: Keith Turner
>            Assignee: Manoj Govindassamy
>
> With the following config, if I call fs.listStatus("/nn1/a/b") when {{/nn1/a/b}} does not exist then ...
> {noformat}
> <configuration>
>   <property>
>     <name>fs.default.name</name>
>     <value>viewfs:///</value>
>   </property>
>   <property>
>     <name>fs.viewfs.mounttable.default.link./nn1</name>
>     <value>hdfs://host1:9000</value>
>   </property>
>   <property>
>     <name>fs.viewfs.mounttable.default.link./nn2</name>
>     <value>hdfs://host2:9000</value>
>   </property>
> </configuration>
> {noformat}
> I will see an error message like the following.  
> {noformat}
> java.io.FileNotFoundException: File /a/b does not exist.
>         at org.apache.hadoop.hdfs.DistributedFileSystem.listStatusInternal(DistributedFileSystem.java:644)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.access$600(DistributedFileSystem.java:92)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$14.doCall(DistributedFileSystem.java:702)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$14.doCall(DistributedFileSystem.java:698)
>         at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.listStatus(DistributedFileSystem.java:698)
>         at org.apache.hadoop.fs.FilterFileSystem.listStatus(FilterFileSystem.java:222)
>         at org.apache.hadoop.fs.viewfs.ChRootedFileSystem.listStatus(ChRootedFileSystem.java:228)
>         at org.apache.hadoop.fs.viewfs.ViewFileSystem.listStatus(ViewFileSystem.java:366)
> {noformat}
> I think it would be useful for ViewFS to wrap the FileNotFoundException from the inner filesystem, giving an error message like the following.  The following error message has the resolved and unresolved paths which is very useful for debugging.
> {noformat}
> java.io.FileNotFoundException: File /nn1/a/b does not exist.
>         at org.apache.hadoop.fs.viewfs.ViewFileSystem.listStatus(ViewFileSystem.java:366)
> Caused by: java.io.FileNotFoundException: File /a/b does not exist.
>         at org.apache.hadoop.hdfs.DistributedFileSystem.listStatusInternal(DistributedFileSystem.java:644)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.access$600(DistributedFileSystem.java:92)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$14.doCall(DistributedFileSystem.java:702)
>         at org.apache.hadoop.hdfs.DistributedFileSystem$14.doCall(DistributedFileSystem.java:698)
>         at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
>         at org.apache.hadoop.hdfs.DistributedFileSystem.listStatus(DistributedFileSystem.java:698)
>         at org.apache.hadoop.fs.FilterFileSystem.listStatus(FilterFileSystem.java:222)
>         at org.apache.hadoop.fs.viewfs.ChRootedFileSystem.listStatus(ChRootedFileSystem.java:228)
>         at org.apache.hadoop.fs.viewfs.ViewFileSystem.listStatus(ViewFileSystem.java:366)
> {noformat}



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