HDFGroup / HDFGroup/hermes

Implement Policy-Based Metadata Replication

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Dominant language
C++
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19
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Description

Write-only workloads:
* Keep metadata locally to the node

Read-only workloads:
* Check if metadata replicated on this node
* If not, get metadata using distributed hashing and keep until space is needed

Read-After-Write File Per Process:
* Keep metadata locally on node
* Reads and writes are automatically synchronized.

Read-After-Write Across Processes (Strong Consistency):
* The set of replicas need to be tracked
* For each write, invalidate replicas
* For each read, cache replica

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