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https://issues.apache.org/jira/browse/CASSANDRA-18344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17707343#comment-17707343
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Aleksey Yeschenko commented on CASSANDRA-18344:
-----------------------------------------------
[https://github.com/apache/cassandra/pull/2256]
Pre-requisite patch-set for several upcoming Accord changes.
Introduces an append-only journal for Accord messages. The journal supports
invalidating individual entries by id and sets of owners, and looking up
records by id, among other things.
Several complete/near-complete parts of the generic journal implementation have
been temporarily taken out until we need them (soon, once bootstrap/state
reclamation are implemented).
These include:
* invalidation support (in memory and on-disk implementations), and
* segment compaction (not needed without invalidations)
PreAccept, Accept, Commit, and Apply are now written to a journal but aren't
yet being read/used.
Test coverage needs and comments around certain areas need work before commit.
Coming soon.
> Store PreAccept, Accept, Commit, and Apply in a durable log before processing
> by CommandStores
> ----------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-18344
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18344
> Project: Cassandra
> Issue Type: New Feature
> Components: Accord
> Reporter: Aleksey Yeschenko
> Assignee: Aleksey Yeschenko
> Priority: Normal
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Write PreAccept, Accept, Commit, and Apply messages durably to a journal.
> CommandStore will then processes the messages in write order.
>
> This is a prerequisite JIRA for several incoming improvements, such as
> reducing the data we store in system tables, making command stores and
> progress log persistent, simplifying caching.
> The journal supports invalidating individual entries by id and sets of
> owners, and looking up records by id, both needed for near-future Accord work.
>
> Several complete/near-complete parts of the generic journal implementation
> have been temporarily taken out until we need them (soon, once
> bootstrap/state reclamation are implemented).
> These include invalidation support (in memory and on-disk implementations),
> and segment compaction (not needed without invalidations).
>
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