Saketa Chalamchala created HDDS-16229:
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Summary: Add RocksDB skip-cache-only MultiGet for secondary DBs
Key: HDDS-16229
URL: https://issues.apache.org/jira/browse/HDDS-16229
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Saketa Chalamchala
Assignee: Saketa Chalamchala
Add a skip-cache-only batch read path through the HDDS DB layer and wire
snap-diff to use it. Useful for batched gets on secondary DBs like snapshots
for snapshot diff.
1. RocksDatabase.multiGet(ColumnFamily, List<byte[]>) -> RocksDB.multiGetAsList
2. RDBTable.multiGetSkipCache
3. Table.multiGetSkipCache(default loops getSkipCache; override in TypedTable,
DatanodeTable, InMemoryTestTable)
DagDiffSequentialReader.loadFileBatch → one multiGetSkipCache call per batch
(1000 keys){{{}{}}}
Out of scope: cache-aware `multiGet`, dedicated metrics, `CodecBuffer` fast
path, adoption outside snap-diff.
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