HDDS-6541. [Merge rocksdb in datanode] Per-disk DB location management.#3292

Merged

ChenSammi merged 16 commits intoapache:HDDS-3630from

guihecheng:HDDS-6541

Apr 22, 2022

Commits on Apr 11, 2022

Add necessary LayoutFeature utils so as to init per-disk db instances conditionally.
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Define new DbVolume for optional dedicated volumes for db instances.
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DB instance format and load for HddsVolume.
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Fix TestDatanodeUpgradeToScmHA.
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Commits on Apr 12, 2022

Fix acceptance test of non-rolling-upgrade.
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Commits on Apr 15, 2022

Refine the description of a new config item.
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Shutdown dbVolumeSet and add dbVolume info to node reports.
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Commits on Apr 19, 2022

Add VERSION file for DbVolume and refactor db instance create & load logics.
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Add a config switch for schema v3 and a helper function.
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Add dedicated tests to verify that no odd db instance is created.
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Make chooseSchemaVersion use isFinalizedAndEnabled.
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Fix findbugs.
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Commits on Apr 21, 2022

Some renames.
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Log level warn -> error.
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Check state NORMAL instead of clusterID.
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DbVolume Set -> Map.
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