Kaijie Chen created HDDS-7428:
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Summary: Pass RequestedSize to SCM in AllocateBlock RPC
Key: HDDS-7428
URL: https://issues.apache.org/jira/browse/HDDS-7428
Project: Apache Ozone
Issue Type: Improvement
Reporter: Kaijie Chen
Assignee: Kaijie Chen
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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