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https://issues.apache.org/jira/browse/CASSANDRA-17102?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Benedict Elliott Smith updated CASSANDRA-17102:
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Description:
Create a new data structure and system for combining Commit Log and Hints. This
system will support compaction of commit log segments when the commit log is
under space pressure, but under normal operation will continue to drop entire
log records as soon as they become invalidated. By ensuring compaction only
occurs for segments that are under 50% utilised we bound space and bandwidth at
2x optimal (and can tune this trade-off if we prefer, e.g. trading more space
for less bandwidth)
This system will replace the storage layer for Commit Log and Hints, and be
used to implement distributed repair for Accord (and perhaps other systems in
future)
was:Create a new data structure and system for combining Commit Log and
Hints. This system will support compaction of commit log segments when the
commit log is under space pressure, but under normal operation will continue to
drop entire log records as soon as they become invalidated. By ensuring
compaction only occurs for segments that are under 50% utilised we bound space
and bandwidth at 2x optimal (and can tune this trade-off if we prefer, e.g.
trading more space for less bandwidth)
> CEP-15: (C*) Unified Commit Log
> -------------------------------
>
> Key: CASSANDRA-17102
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17102
> Project: Cassandra
> Issue Type: Sub-task
> Components: Local/Commit Log
> Reporter: Benedict Elliott Smith
> Priority: Normal
>
> Create a new data structure and system for combining Commit Log and Hints.
> This system will support compaction of commit log segments when the commit
> log is under space pressure, but under normal operation will continue to drop
> entire log records as soon as they become invalidated. By ensuring compaction
> only occurs for segments that are under 50% utilised we bound space and
> bandwidth at 2x optimal (and can tune this trade-off if we prefer, e.g.
> trading more space for less bandwidth)
> This system will replace the storage layer for Commit Log and Hints, and be
> used to implement distributed repair for Accord (and perhaps other systems in
> future)
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