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Posted to commits@cassandra.apache.org by "Romain Hardouin (JIRA)" <ji...@apache.org> on 2017/02/28 10:10:45 UTC
[jira] [Created] (CASSANDRA-13279) Table settings file
Romain Hardouin created CASSANDRA-13279:
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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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