steveloughran commented on a change in pull request #802: HADOOP-16279.
S3Guard: Implement time-based (TTL) expiry for entries …
URL: https://github.com/apache/hadoop/pull/802#discussion_r289509523
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File path:
hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/s3guard/MetadataStore.java
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@@ -212,29 +225,54 @@ void move(Collection<Path> pathsToDelete,
void destroy() throws IOException;
/**
- * Clear any metadata older than a specified time from the repository.
- * Implementations MUST clear file metadata, and MAY clear directory metadata
- * (s3a itself does not track modification time for directories).
- * Implementations may also choose to throw UnsupportedOperationException
- * istead. Note that modification times should be in UTC, as returned by
- * System.currentTimeMillis at the time of modification.
+ * Prune method with two modes of operation:
+ * <ul>
+ * <li>
+ * {@link PruneMode#ALL_BY_MODTIME}
+ * Clear any metadata older than a specified mod_time from the store.
+ * Note that this modification time is the S3 modification time from the
+ * object's metadata - from the object store.
+ * Implementations MUST clear file metadata, and MAY clear directory
+ * metadata (s3a itself does not track modification time for directories).
+ * Implementations may also choose to throw UnsupportedOperationException
+ * instead. Note that modification times should be in UTC, as returned by
Review comment:
MUST be in UTC
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