Aravindan Vijayan created HDDS-1105:
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Summary: Create an OM API that takes in a RocksDB sequence number
and attempts to return all transactions after that.
Key: HDDS-1105
URL: https://issues.apache.org/jira/browse/HDDS-1105
Project: Hadoop Distributed Data Store
Issue Type: Sub-task
Reporter: Aravindan Vijayan
Assignee: Aravindan Vijayan
*Some context*
The FSCK server will periodically invoke this OM API passing in the most recent
sequence number of its own RocksDB instance. The OM will use the RockDB
getUpdateSince() API to answer this query. Since the getUpdateSince API only
works against the RocksDB WAL, we have to configure OM RocksDB WAL
(https://github.com/facebook/rocksdb/wiki/Write-Ahead-Log) with sufficient max
size to make this API useful. If the OM cannot get all transactions since the
given sequence number (due to WAL flushing), it can error out. In that case the
FSCK server can fall back to getting the entire checkpoint snapshot implemented
in HDDS-1085.
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