[jira] [Created] (HADOOP-15423) Use single hash Path -> tuple(DirListingMetadata, PathMetadata) in LocalMetadataStore

["Gabor Bota (JIRA)" <ji...@apache.org>]

Gabor Bota created HADOOP-15423:
-----------------------------------

             Summary: Use single hash Path -> tuple(DirListingMetadata, PathMetadata) in LocalMetadataStore
                 Key: HADOOP-15423
                 URL: https://issues.apache.org/jira/browse/HADOOP-15423
             Project: Hadoop Common
          Issue Type: Sub-task
            Reporter: Gabor Bota
            Assignee: Gabor Bota


Right now the s3guard.LocalMetadataStore uses two HashMap in the implementation one for the file and one for the dir hash.
{code:java}
  /** Contains directories and files. */
  private LruHashMap<Path, PathMetadata> fileHash;

  /** Contains directory listings. */
  private LruHashMap<Path, DirListingMetadata> dirHash;
{code}

It would be nice to have only one hash instead of these two for storing the values. An idea for the implementation would be to have a class with nullable fields:

{code:java}
  static class LocalMetaEntry {
    @Nullable
    public PathMetadata pathMetadata;
    @Nullable
    public DirListingMetadata dirListingMetadata;
  }
{code}

or a Pair (tuple):

{code:java}
Pair<PathMetadata, DirListingMetadata> metaEntry;
{code}

And only one hash/cache for these elements.



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