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https://issues.apache.org/jira/browse/HBASE-28804?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wellington Chevreuil resolved HBASE-28804.
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Resolution: Fixed
Merged into master, branch-3 and branch-2. Thanks for the contribution,
[~janardhan.hungund]!
> Implement asynchronous retrieval of bucket-cache data from persistence.
> -----------------------------------------------------------------------
>
> Key: HBASE-28804
> URL: https://issues.apache.org/jira/browse/HBASE-28804
> Project: HBase
> Issue Type: Task
> Components: BucketCache
> Affects Versions: 2.6.0, 3.0.0-beta-1, 4.0.0-alpha-1, 2.7.0
> Reporter: Janardhan Hungund
> Assignee: Janardhan Hungund
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0-alpha-1, 2.7.0, 3.0.0-beta-2
>
>
> During the retrieval of data from bucket cache persistence file, a
> transient structure that stores the blocks ordered by filename is constructed
> from the backing map entries. The population of this transient structure is
> done during the server start-up. This process increases the region-server
> startup time, if the bucketcache has large number of blocks.
> This population happens inline with the server restart and blocks the server
> for several minutes. This makes the server restart inconvenient for the
> external users. Restarts during upgrade can run into timeout issues due to
> this delay in the server startup.
> Hence, the recommendation in this Jira is to make the cache-retrieval
> asynchronous to the server startup. During a server startup, a new thread is
> spawn that reads the persistence file and creates the required structures
> from persistence file. The server continues with the restart and does not
> wait for the bucket-cache initialisation to complete.
> Note that the bucket cache is 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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