Created Choosing a Filer Store (markdown)

Choosing-a-Filer-Store.md

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+Here is a list of common questions about choosing a filer store.
+
+## Cassandra vs ScyllaDB vs others
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+Cassandra and ScyllaDB are distributed, having native support for TTL.
+
+The data structure is the same for Cassandra and ScyllaDB. If a directory has too many updates, there would be corresponding number of tombstones if the SSTable compaction did not kick in. Too many tombstones would slow down the queries.
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+This happened in one user where “/tmp” folder is used as a staging folder for all uploaded files, the read operations becomes slower and slower for this folder. Changing to redis with [[Path-Specific-Filer-Store]] for this folder resolved this performance issue.
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