Varun Sharma created HDFS-4960:
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Summary: Unnecessary .meta seeks even when skip checksum is true
Key: HDFS-4960
URL: https://issues.apache.org/jira/browse/HDFS-4960
Project: Hadoop HDFS
Issue Type: Improvement
Affects Versions: 3.0.0, 2.1.0-beta
Reporter: Varun Sharma
While attempting to benchmark an HBase + Hadoop 2.0 setup on SSDs, we found
unnecessary seeks into .meta files, each seek was a 7 byte read at the head of
the file - this attempts to validate the version #. Since the client is
requesting no-checksum, we should not be needing to touch the .meta file at all.
Since the purpose of skip checksum is to also avoid the performance penalty of
the extra seek, we should not be seeking into .meta if skip checksum is true
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