[
https://issues.apache.org/jira/browse/HADOOP-9713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13703513#comment-13703513
]
Steve Loughran commented on HADOOP-9713:
----------------------------------------
A stack trace
{code}
estNoMkdirOverFile(org.apache.hadoop.fs.contract.ftp.TestFTPDirectoryContract)
Time elapsed: 928 sec <<< ERROR!
java.io.IOException: Seek not supported
at org.apache.hadoop.fs.ftp.FTPInputStream.seek(FTPInputStream.java:62)
at org.apache.hadoop.fs.FSInputStream.read(FSInputStream.java:65)
at org.apache.hadoop.fs.FSInputStream.readFully(FSInputStream.java:76)
at
org.apache.hadoop.fs.FSDataInputStream.readFully(FSDataInputStream.java:103)
at
org.apache.hadoop.fs.contract.ContractTestUtils.readDataset(ContractTestUtils.java:154)
at
org.apache.hadoop.fs.contract.AbstractDirectoryContractTest.testNoMkdirOverFile(AbstractDirectoryContractTest.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
{code}
> FSDataInputStream.readFully doesn't work on filesystems without seek -even
> when the offset==getPos
> --------------------------------------------------------------------------------------------------
>
> Key: HADOOP-9713
> URL: https://issues.apache.org/jira/browse/HADOOP-9713
> Project: Hadoop Common
> Issue Type: Bug
> Components: fs
> Affects Versions: 3.0.0, 2.1.0-beta, 1.3.0
> Reporter: Steve Loughran
> Priority: Minor
>
> {{FSDataInputStream.readFully(offset,data)}} doesn't work even if the
> offset==the current location -because it always seeks to the offset and seeks
> back. No seek => Exception.
> We could optimise {{FSDataInputStream.readFully(offset,data)}} to eliminate
> the seeks on these operations -which would have tangible benefits for those
> filesystems where seek is expensive (remote blobstores). It would also let
> you use readFully against filesystems without seeks, provided you are only
> reading from the current location.
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
