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Date: Tue, 19 Jul 2016 22:57:20 +0000 (UTC)
From: "Daryn Sharp (JIRA)" <jira@apache.org>
To: hdfs-dev@hadoop.apache.org
Message-ID: <JIRA.12990950.1468969012000.77955.1468969040520@Atlassian.JIRA>
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Subject: [jira] [Created] (HDFS-10656) Optimize conversion of byte arrays
 back to path string
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archived-at: Tue, 19 Jul 2016 22:57:22 -0000

Daryn Sharp created HDFS-10656:
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             Summary: Optimize conversion of byte arrays back to path string
                 Key: HDFS-10656
                 URL: https://issues.apache.org/jira/browse/HDFS-10656
             Project: Hadoop HDFS
          Issue Type: Sub-task
          Components: hdfs
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp


{{DFSUtil.byteArray2PathString}} generates excessive object allocation.
# each byte array is encoded to a string (copy)
# string appended to a builder which extracts the chars from the intermediate string (copy) and adds to its own char array
# builder's char array is re-alloced if over 16 chars (copy)
# builder's toString creates another string (copy)

Instead of allocating all these objects and performing multiple byte/char encoding/decoding conversions, the byte array can be built in-place with a single final conversion to a string.


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