[jira] [Created] (HDFS-12652) INodeAttributesProvider#getAttributes(): Avoid multiple conversions of path components byte[][] to String[] when requesting INode attributes

["Manoj Govindassamy (JIRA)" <ji...@apache.org>]

Manoj Govindassamy created HDFS-12652:
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             Summary: INodeAttributesProvider#getAttributes(): Avoid multiple conversions of path components byte[][] to String[] when requesting INode attributes
                 Key: HDFS-12652
                 URL: https://issues.apache.org/jira/browse/HDFS-12652
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs
    Affects Versions: 3.0.0-beta1
            Reporter: Manoj Govindassamy
            Assignee: Manoj Govindassamy


{{INodeAttributesProvider#getAttributes}} needs the path components passed in to be an array of Strings. Where as the INode and related layers maintain path components as an array of byte[]. So, these layers are required to convert each byte[] component of the path back into a string and for multiple times when requesting for INode attributes from the Provider. 

That is, the path "/a/b/c" requires calling the attribute provider with: (1) "", (2) "", "a", (3) "", "a","b", (4) "", "a","b", "c". Every single one of those strings were freshly (re)converted from a byte[]. Say, a file listing is done on a huge directory containing 100s of millions of files, then these multiple time redundant conversions of byte[][] to String[] create lots of tiny object garbages, occupying memory and affecting performance. Better if we could avoid creating redundant copies of path component strings.
  



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