Janardhan Hungund created HBASE-28772:
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Summary: Implement asynchronous bucket-cache recovery from
persistence.
Key: HBASE-28772
URL: https://issues.apache.org/jira/browse/HBASE-28772
Project: HBase
Issue Type: Task
Components: BucketCache
Reporter: Janardhan Hungund
Assignee: Janardhan Hungund
During the recovery of bucket cache from persistence, we need to rebuild a
transient in-memory structure (blockByHfile) which has the blocks sorted
according to their filenames.
This transient structure population is done during the server start-up during
the recreation of bucket cache from persistence. This process can be
time-consuming if bucket-cache has large number of blocks. (in millions). This
population is executed inline with the server restart and this blocks the
server from being available for several minutes. This makes the server restart
inconvenient for the external users.
The need is to make the cache retrieval asynchronous to server restart by
spawning a new thread that rebuilds cache from the persistence, while the
server continues with its restart. This prevents an unnecessary delay in the
server restart.
Note that the bucket cache may not available immediately for usage and will
only be ready to use after the data is repopulated from persistence into memory.
Thanks,
Janardhan
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