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Date: Thu, 20 Aug 2009 06:47:14 -0700 (PDT)
From: "Steve Loughran (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Subject: [jira] Created: (HDFS-554) BlockInfo.ensureCapacity may get a
 speedup from System.arraycopy()
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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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