[jira] [Created] (CASSANDRA-12907) Different data directories for SSDs and HDDs at configuration level

["Natale Galioto (JIRA)" <ji...@apache.org>]

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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