Natale Galioto created CASSANDRA-12907:
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Summary: Different data directories for SSDs and HDDs at
configuration level
Key: CASSANDRA-12907
URL: https://issues.apache.org/jira/browse/CASSANDRA-12907
Project: Cassandra
Issue Type: Improvement
Reporter: Natale Galioto
Currently, users can speed up some CFs by symlinking its data directory to fast
media such as SSDs. In my opinion, instead, configuration file should allow two
different sets of directory: one dedicated to spindles, one dedicated to SSDs.
This would allow a "once and for all mixed SSD & HDD configuration", instead of
continuously symlinking the "right" directory each time a CF is created (due to
the name mangling of the CF directories).
And this in turn would allow a priori knowledge on disk structures, and would
allow to place indexes of all sort (lookup, partition, etc... everything that
is needed to "just" locate data) on fast SSDs, speeding up ALL the CFs instead
of only one, while the HDDs could be used just for data retrieval and
sequential reads.
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