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From "Romain Hardouin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CASSANDRA-13279) Table settings file
Date Tue, 28 Feb 2017 10:10:45 GMT
Romain Hardouin created CASSANDRA-13279:
-------------------------------------------

             Summary: Table settings file
                 Key: CASSANDRA-13279
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13279
             Project: Cassandra
          Issue Type: Wish
          Components: Configuration
            Reporter: Romain Hardouin
            Priority: Minor


Following CASSANDRA-13241 we often see that there is no one-size-fits-all value for settings.
We can't find a sweet spot for every use cases.

It's true for settings in cassandra.yaml but as [~brstgt] said for {{chunk_length_in_kb}}:
"this is somewhat hidden for the average user". 
Many table settings are somewhat hidden for the average user. Some people will think RTFM
but if a file - say tables.yaml - contains default values for table settings, more people
would pay attention to them. And of course this file could contain useful comments and guidance.


Example with SSTable compression options:

{code}
# General comments about sstable compression
compression:

    # First of all: explain what is it. We split each SSTable into chunks, etc.
    # Explain when users should lower this value (e.g. 4) or when a higher value like 64 or
128 are recommended.
    # Explain the trade-off between read latency and off-heap compression metadata size.
    chunk_length_in_kb: 16
    
    # List of available compressor: LZ4Compressor, SnappyCompressor, and DeflateCompressor
    # Explain trade-offs, some specific use cases (e.g. archives), etc.
    class: 'LZ4Compressor'
    
    # If you want to disable compression by default, uncomment the following line
    #enabled: false
{code}

So instead of hard coded values we would end up with something like TableConfig + TableDescriptor
à la Config + DatabaseDescriptor.



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