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new b420e4092ef MINOR: ELR release note for 4.1 (#19909)
b420e4092ef is described below
commit b420e4092efab73a428ab53f3011c94e5bb7461f
Author: Calvin Liu <[email protected]>
AuthorDate: Mon Jun 9 17:05:20 2025 -0700
MINOR: ELR release note for 4.1 (#19909)
Mention that ELR will be enabled by default on new clusters in 4.1
Reviewers: Justine Olshan <[email protected]>
---
docs/ops.html | 8 ++++----
docs/upgrade.html | 4 ++++
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/docs/ops.html b/docs/ops.html
index 247c7c00529..09842ee2084 100644
--- a/docs/ops.html
+++ b/docs/ops.html
@@ -4446,10 +4446,10 @@ $ bin/kafka-topics.sh --create --topic tieredTopic
--bootstrap-server localhost:
<h4 class="anchor-heading"><a id="eligible_leader_replicas_overview"
class="anchor-link"></a><a
href="#eligible_leader_replicas_overview">Overview</a></h4>
<p>Starting from Apache Kafka 4.0, Eligible Leader Replicas (<a
href="https://cwiki.apache.org/confluence/x/mpOzDw";>KIP-966 Part 1</a>)
- is available for the users to an improvement to Kafka replication. As the
"strict min ISR" rule has been generally applied, which means the high
watermark for the data partition can't advance
- if the size of the ISR is smaller than the min
ISR(<code>min.insync.replicas</code>), it makes some replicas that are not in
the ISR safe to become the leader. The KRaft controller
- stores such replicas in the PartitionRecord field called <code>Eligible
Leader Replicas</code>. During the leader election, the controller will select
the leaders
- with the following order:</p>
+ is available for the users to an improvement to Kafka replication (ELR is
enabled by default on new clusters starting 4.1). As the "strict min ISR" rule
has been generally applied,
+ which means the high watermark for the data partition can't advance if the
size of the ISR is smaller than the min ISR(<code>min.insync.replicas</code>),
it makes some replicas
+ that are not in the ISR safe to become the leader. The KRaft controller
stores such replicas in the PartitionRecord field called <code>Eligible Leader
Replicas</code>. During the
+ leader election, the controller will select the leaders with the following
order:</p>
<ul>
<li>If ISR is not empty, select one of them.</li>
<li>If ELR is not empty, select one that is not fenced.</li>
diff --git a/docs/upgrade.html b/docs/upgrade.html
index ad011aa2587..1be3a20faa7 100644
--- a/docs/upgrade.html
+++ b/docs/upgrade.html
@@ -46,6 +46,10 @@
After the removal, <code>log.cleaner.threads</code>
will also have a lower bound of 1.
For further details, please refer to <a
href="https://cwiki.apache.org/confluence/x/XAyWF";>KIP-1148</a>.
</li>
+ <li>
+ The KIP-966 part 1: Eligible Leader Replicas(ELR) will
be enabled by default on the new clusters.
+ For further details, please refer to <a
href="/{{version}}/documentation.html#eligible_leader_replicas">here</a>.
+ </li>
</ul>
</li>
<li><b>Producer</b>
