BlockInfo.ensureCapacity may get a speedup from System.arraycopy()
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Key: HDFS-554
URL: https://issues.apache.org/jira/browse/HDFS-554
Project: Hadoop HDFS
Issue Type: Improvement
Components: name-node
Affects Versions: 0.21.0
Reporter: Steve Loughran
Priority: Minor
BlockInfo.ensureCapacity() uses a for() loop to copy the old array data into
the expanded array. {{System.arraycopy()}} is generally much faster for this,
as it can do a bulk memory copy. There is also the typesafe Java6
{{Arrays.copyOf()}} to consider, though here it offers no tangible benefit.
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