Janardhan Hungund created HBASE-28805:
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Summary: Implement chunked persistence of backing map for
persistent bucket cache.
Key: HBASE-28805
URL: https://issues.apache.org/jira/browse/HBASE-28805
Project: HBase
Issue Type: Task
Components: BucketCache
Reporter: Janardhan Hungund
Assignee: Janardhan Hungund
The persistent bucket cache implementation feature relies on the persistence of
backing map to a persistent file. the protobuf APIs are used to serialise the
backing map and its related structures into the file. An asynchronous thread
periodically flushes the contents of backing map to the persistence file.
The protobuf library has a limitation of 2GB on the size of protobuf messages.
If the size of backing map increases beyond 2GB, an unexpected exception is
reported in the asynchronous thread and stops the persister thread. This causes
the persistent file go out of sync with the actual bucket cache. Due to this,
the bucket cache shrinks to a smaller size after a cache restart.
This Jira tracks the implementation of introducing chunking of the backing map
to persistence such that every protobuf is smaller than 2GB in size.
Thanks,
Janardhan
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