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https://issues.apache.org/jira/browse/CASSANDRA-17034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17436054#comment-17436054
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Branimir Lambov edited comment on CASSANDRA-17034 at 10/29/21, 4:17 PM:
------------------------------------------------------------------------
Patch uploaded here:
[branch|https://github.com/blambov/cassandra/tree/CASSANDRA-17034] [pull
request|https://github.com/apache/cassandra/pull/1295]
For reviewers it will be better to look at the individual commits. The first
one is sizeable but trivial, adding the flush reason to all places that request
a flush. The second is the bulk of the work, which splits {{Memtable}} into an
interface and hierarchy of classes that add pieces of memtable functionality,
ending in {{SkipListMemtable}} which is the current implementation; flushing
functionality is moved outside of {{ColumnFamilyStore}}, and new functionality
to write temporary sstables for streaming from long-lived memtables is added.
The rest of the commits add a mechanism for providing shard boundaries that
split the owned space equally, and a basic common interface for reading
memtables and sstables.
Usages of the API, i.e. alternative memtable implementations, will be provided
soon.
was (Author: blambov):
Patch uploaded here:
[branch|https://github.com/blambov/cassandra/tree/CASSANDRA-17034] [pull
request|https://github.com/apache/cassandra/pull/1295]
For reviewers it will be better to look at the individual commits. The first
one is sizeable but trivial, adding the flush reason to all places that request
a flush. The second is the bulk of the work, which splits {{Memtable}} into an
interface and hierarchy of classes that add pieces of memtable functionality,
ending in {{SkipListMemtable}} which is the current implementation. The rest of
the commits add a mechanism for providing shard boundaries that split the owned
space equally, and a basic common interface for reading memtables and sstables.
> CEP-11: Memtable API implementation
> -----------------------------------
>
> Key: CASSANDRA-17034
> URL: https://issues.apache.org/jira/browse/CASSANDRA-17034
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Memtable
> Reporter: Branimir Lambov
> Assignee: Branimir Lambov
> Priority: Normal
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Pluggable memtable API as described in
> [CEP-11|https://cwiki.apache.org/confluence/display/CASSANDRA/CEP-11%3A+Pluggable+memtable+implementations].
>
> Initial version is already available in [this
> branch|https://github.com/datastax/cassandra/tree/memtable-api], and needs to
> be updated to the changes in trunk. Two additional features suggested by CEP
> reviewers are also to be implemented:
> * Sharding support: extending the memtable owner interface to supply
> suitable shard boundaries that split the owned token space and are in
> agreement with disk boundaries.
> * Shared read API with sstables: defining a common interface for reading
> partitions from memtables and sstables; this is to include filters to avoid
> unnecessary copying.
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