This is an automated email from the ASF dual-hosted git repository.
maedhroz pushed a commit to branch trunk
in repository https://gitbox.apache.org/repos/asf/cassandra.git
commit 3e38b3d641c076f45ebc108f68218529766c7492
Author: Caleb Rackliffe <maedh...@users.noreply.github.com>
AuthorDate: Tue Jul 18 12:46:18 2023 -0700
Release notes and README updates for CEP-7 (Storage-Attached Indexes)
---
CHANGES.txt | 1 +
NEWS.txt | 2 ++
src/java/org/apache/cassandra/index/sai/README.md | 9 +++++----
3 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/CHANGES.txt b/CHANGES.txt
index 153117ba85..3b7d1bc9ff 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,4 +1,5 @@
5.0
+ * CEP-7: Storage Attached Indexes (CASSANDRA-16052)
* Add equals/hashCode override for ServerEncryptionOptions (CASSANDRA-18428)
* Upgrade ECJ to version 3.33.0 (CASSANDRA-18190)
* Fix ClassCastException from jdk GaloisCounterMode when using JDK17
provider (CASSANDRA-18180)
diff --git a/NEWS.txt b/NEWS.txt
index d2c9f21945..91fac33c98 100644
--- a/NEWS.txt
+++ b/NEWS.txt
@@ -71,6 +71,8 @@ using the provided 'sstableupgrade' tool.
New features
------------
+ - Added a new secondary index implementation, Storage-Attached Indexes
(SAI). Overview documentation and a basic
+ tutorial can be found at
src/java/org/apache/cassandra/index/sai/README.md.
- *Experimental* support for Java 17 has been added. JVM options that
differ between or are
specific for Java 17 have been added into jvm17.options.
IMPORTANT: Running C* on Java 17 is *experimental* and do it at your own
risk.
diff --git a/src/java/org/apache/cassandra/index/sai/README.md
b/src/java/org/apache/cassandra/index/sai/README.md
index 1b434dba3c..36176a4c61 100644
--- a/src/java/org/apache/cassandra/index/sai/README.md
+++ b/src/java/org/apache/cassandra/index/sai/README.md
@@ -19,24 +19,25 @@
# Storage-Attached Indexing
## Overview
-Storage-attached indexing is a column based secondary indexing apparatus for
Cassandra.
+Storage-attached indexing is a column based local secondary index
implementation for Cassandra.
The project was inspired by SASI (SSTable-Attached Secondary Indexes) and
retains some of its high-level
architectural character (and even some actual code), but makes significant
improvements in a number of areas:
- The on-disk/SSTable index formats for both string and numeric data have been
completely replaced. Strings are indexed
- on disk using our proprietary on-disk byte-ordered trie data structure,
while numeric types are indexed using a
- balanced tree.
+ on disk using a byte-ordered trie data structure, while numeric types are
indexed using a block-oriented balanced tree.
- While indexes continue to be managed at the column level from the user's
perspective, the storage design at the column
index level is row-based, with related offset and token information stored
only once at the SSTable level. This
drastically reduces our on-disk footprint when several columns are indexed
on the same table.
- Tracing, metrics, virtual table-based metadata and snapshot-based
backup/restore are supported out of the box.
+- On-disk index components can be streamed completely when entire SSTable
streaming is enabled.
+- Incremental index building is supported, and on-disk index components are
included in snapshots.
Many similarities with standard secondary indexes remain:
- The full set of C* consistency levels is supported for both reads and writes.
- Index updates are synchronous with mutations and do not require any kind of
read-before-write.
-- Queries are implemented on the back of C* range reads.
+- Global queries are implemented on the back of C* range reads.
- Paging is supported.
- Only token ordering of results is supported.
- Index builds are visible to operators as compactions and are executed on
compaction threads.
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