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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