THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- receives callback events for leadership changes and stop/delete events of topic partitions on a broker.
- delegates copy and read of these segments and deleting topic partitions to a pluggable storage manager(viz RemoteStorageManager) implementation.
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- RLM Leader Task - It checks for rolled over LogSegments (which have last message offset less than last stable offset of that topic partition) and copies them 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 here. It also serves the fetch requests for older data from the remote tier. Local logs are not cleanedup till those segments are copied successfully to remote even though their retention time/size is reached.
- RLM Follower Task - In this mode, RLM it 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. Local logs are not cleanedup till their remote log indexes are copied locally from remote storage even though their retention time/size is reached. RLM follower can also serve reading old data from the remote tier.
Core Kafka changes
To satisfy the goal of keeping Kafka changes minimal when RLM is not configured, Kafka behavior remains unchanged for existing users.
- Core Kafka starts RLM service if tiered storage is configured
- When an offset index is not found, if RLM is configured, the read request is delegated to RLM to serve the data from the remote tier.
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Remote
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Log Indexes
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For each topic partition that has RLM configured, RLM leader for a topic partition copies log segments which have last message offset less than last stable offset of that topic partition to remote storage. The active segment file (the last segment file of each partition, to which the new records are appending) is never shipped to remote storage.
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