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https://issues.apache.org/jira/browse/HDDS-7428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kaijie Chen updated HDDS-7428:
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Summary: Calculate number of blocks to allocate on SCM (was: Pass
RequestedSize to SCM in AllocateBlock RPC)
> Calculate number of blocks to allocate on SCM
> ---------------------------------------------
>
> Key: HDDS-7428
> URL: https://issues.apache.org/jira/browse/HDDS-7428
> Project: Apache Ozone
> Issue Type: Improvement
> Reporter: Kaijie Chen
> Assignee: Kaijie Chen
> Priority: Major
>
> Currently, AllocateBlock takes two major arguments: size and num. There are
> some problems in the current API:
> # For EC replication type, the allocated size for clients to write is {{size
> * ec.numData * num}}, which is not a good abstraction from the HDDS client's
> view.
> # It assumes all blocks are in same size. However, sometimes it's useful to
> let SCM allocate arbitrary size the client wants (e.g. when client know the
> key size in advance).
> In this Jira, I wish to add a {{RequestedSize}} field in the AllocateBlock
> RPC.
> When it's not set (equals to 0), SCM will use the legacy {{size}} and {{num}}.
> When it's set, SCM will calculate how many blocks to allocate based on
> {{RequestedSize}}.
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