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  • It will delegate the copy and read of these segments to a pluggable storage manager implementation.
  • RLM has two modes:
    • RLM Leader - In this mode, RLM is the leader for topic-partition, checks for rolled over LogSegments (which have last message offset less than last stable offset of that topic partition) and copies it along with their remote offset/time indexes to the remote tier. RLM creates an index file, called RemoteLogSegmentIndex, per topic-partition to track remote LogSegments. These indexes are described in detail in the next section. Additionally, the RLM leader also serves the fetch requests for older data from the remote tier.
    • RLM Follower - In this mode, RLM keeps track of the segments and index files on remote tier and updates its RemoteLogSegmentIndex file per topic-partition. RLM follower does not serve reading old data from the remote tier.

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