[jira] [Updated] (CASSANDRA-9779) Append-only optimization
[
https://issues.apache.org/jira/browse/CASSANDRA-9779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Jeremy Hanna updated CASSANDRA-9779:
Component/s: Materialized Views
> Append-only optimization
>
>
> Key: CASSANDRA-9779
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9779
> Project: Cassandra
> Issue Type: New Feature
> Components: CQL, Materialized Views
>Reporter: Jonathan Ellis
> Fix For: 4.x
>
>
> Many common workloads are append-only: that is, they insert new rows but do
> not update existing ones. However, Cassandra has no way to infer this and so
> it must treat all tables as if they may experience updates in the future.
> If we added syntax to tell Cassandra about this ({{WITH INSERTS ONLY}} for
> instance) then we could do a number of optimizations:
> - Compaction would only need to worry about defragmenting partitions, not
> rows. We could default to DTCS or similar.
> - CollationController could stop scanning sstables as soon as it finds a
> matching row
> - Most importantly, materialized views wouldn't need to worry about deleting
> prior values, which would eliminate the majority of the MV overhead
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[jira] [Updated] (CASSANDRA-9779) Append-only optimization
[
https://issues.apache.org/jira/browse/CASSANDRA-9779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Aleksey Yeschenko updated CASSANDRA-9779:
-
Flagged: Impediment
> Append-only optimization
>
>
> Key: CASSANDRA-9779
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9779
> Project: Cassandra
> Issue Type: New Feature
> Components: CQL
>Reporter: Jonathan Ellis
> Fix For: 3.x
>
>
> Many common workloads are append-only: that is, they insert new rows but do
> not update existing ones. However, Cassandra has no way to infer this and so
> it must treat all tables as if they may experience updates in the future.
> If we added syntax to tell Cassandra about this ({{WITH INSERTS ONLY}} for
> instance) then we could do a number of optimizations:
> - Compaction would only need to worry about defragmenting partitions, not
> rows. We could default to DTCS or similar.
> - CollationController could stop scanning sstables as soon as it finds a
> matching row
> - Most importantly, materialized views wouldn't need to worry about deleting
> prior values, which would eliminate the majority of the MV overhead
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
[jira] [Updated] (CASSANDRA-9779) Append-only optimization
[
https://issues.apache.org/jira/browse/CASSANDRA-9779?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Aleksey Yeschenko updated CASSANDRA-9779:
-
Flagged: (was: Impediment)
> Append-only optimization
>
>
> Key: CASSANDRA-9779
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9779
> Project: Cassandra
> Issue Type: New Feature
> Components: CQL
>Reporter: Jonathan Ellis
> Fix For: 3.x
>
>
> Many common workloads are append-only: that is, they insert new rows but do
> not update existing ones. However, Cassandra has no way to infer this and so
> it must treat all tables as if they may experience updates in the future.
> If we added syntax to tell Cassandra about this ({{WITH INSERTS ONLY}} for
> instance) then we could do a number of optimizations:
> - Compaction would only need to worry about defragmenting partitions, not
> rows. We could default to DTCS or similar.
> - CollationController could stop scanning sstables as soon as it finds a
> matching row
> - Most importantly, materialized views wouldn't need to worry about deleting
> prior values, which would eliminate the majority of the MV overhead
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
