Keith Turner created HDFS-5692:
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Summary: viewfs shows resolved path in FileNotFoundException
Key: HDFS-5692
URL: https://issues.apache.org/jira/browse/HDFS-5692
Project: Hadoop HDFS
Issue Type: Bug
Affects Versions: 2.2.0
Reporter: Keith Turner
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>
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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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