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https://issues.apache.org/jira/browse/HBASE-28805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated HBASE-28805:
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Labels: pull-request-available (was: )
> 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
> Priority: Major
> Labels: pull-request-available
>
> 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. Checksum errors are also reported.
> 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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