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Posted to common-issues@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2013/07/09 19:13:48 UTC

[jira] [Created] (HADOOP-9713) FSDataInputStream.readFully doesn't work on filesystems without seek -even when the offset==getPos

Steve Loughran created HADOOP-9713:
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             Summary: 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
            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.


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