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https://issues.apache.org/jira/browse/HDDS-11894?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17911721#comment-17911721
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Wei-Chiu Chuang commented on HDDS-11894:
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Hi I'm gearing up for the upcoming Ozone 2.0 release. Please let me know if
this feature is going to complete within the next few days, otherwise I'll move
it out to 2.1.0
> PreAllocate and Cache Blocks in OM
> ----------------------------------
>
> Key: HDDS-11894
> URL: https://issues.apache.org/jira/browse/HDDS-11894
> Project: Apache Ozone
> Issue Type: New Feature
> Components: Ozone Manager, SCM
> Reporter: Tanvi Penumudy
> Assignee: Tanvi Penumudy
> Priority: Major
> Labels: pull-request-available
>
> Whenever a write operation occurs, OM calls into SCM for allocateBlock. This
> adds overhead to each create request, including added latency to reach the
> create and allocateBlock request, as well as resource starvation as the
> thread in OM is blocked for the duration SCM responds to the call. Frequent
> RPC calls to SCM can become a performance bottleneck under heavy workloads.
> To address this, what if we could prefetch (preallocate) blocks from SCM
> asynchronously and cache them within OM to reduce this dependency on SCM?
> Design Proposal:
> [https://docs.google.com/document/d/1hQAIBClitlVbZRetSPNat9Z-6qZzra8QmWLo1I2WL3k/]
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