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Posted to common-dev@hadoop.apache.org by "Steve Loughran (JIRA)" <ji...@apache.org> on 2013/07/09 19:13:49 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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