[jira] [Created] (JAMES-3135) Write a CassandraDumbBlobStoreCache

["Nguyễn Việt Đức (Jira)" <se...@james.apache.org>]

Nguyễn Việt Đức created JAMES-3135:
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             Summary: Write a CassandraDumbBlobStoreCache
                 Key: JAMES-3135
                 URL: https://issues.apache.org/jira/browse/JAMES-3135
             Project: James Server
          Issue Type: Improvement
            Reporter: Nguyễn Việt Đức


Location: {{blob-store-cassandra}} maven project.
 
{{interface BlobStoreCache {   Publisher<Void> cache(BlobId blobId, byte[] data);   Publisher<Void> cache(BlobId blobId, InputStream data);   Publisher<byte[]> read(BlobId);   Publisher<byte[]> delete(BlobId);}}}

*DOD* Write a {{Cassandra}} implementation of it.
 * The cache is responsible of caching only small input, below a configurable threshold. Calling {{cache}} on a too big input should result in nothing being stored. (default 8kb)

 * Failure handling:

 ** Circuit breaking: if retrieving the content takes more than {{blobStore.cache.timeout}} (default to 50ms) then return empty which will result in reading the main data store
 ** Ignore errors: return empty.

GC grace period for this table should be set to 0

ConsistencyLevel ONE

API + contract test + implementation
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Why a cache:
 * We don't want to read the blobStore for small input as it comes with high latency.
 * eg headers

Why Cassandra: distributed on disk storage without "yet another strategy"

Limitation:
 * Replication factor. Should we consider a dedicated 'cache' keyspace with a replicationFactor of one



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