pvcnt commented on code in PR #2039:
URL: https://github.com/apache/solr/pull/2039#discussion_r1410851764
##########
solr/solrj/src/java/org/apache/solr/common/cloud/Replica.java:
##########
@@ -103,31 +104,41 @@ public enum Type {
* support NRT (soft commits) and RTG. Any {@link Type#NRT} replica can
become a leader. A shard
* leader will forward updates to all active {@link Type#NRT} and {@link
Type#TLOG} replicas.
*/
- NRT(true),
+ NRT(true, CollectionAdminParams.NRT_REPLICAS),
/**
* Writes to transaction log, but not to index, uses replication. Any
{@link Type#TLOG} replica
* can become leader (by first applying all local transaction log
elements). If a replica is of
* type {@link Type#TLOG} but is also the leader, it will behave as a
{@link Type#NRT}. A shard
* leader will forward updates to all active {@link Type#NRT} and {@link
Type#TLOG} replicas.
*/
- TLOG(true),
+ TLOG(true, CollectionAdminParams.TLOG_REPLICAS),
/**
* Doesn’t index or writes to transaction log. Just replicates from {@link
Type#NRT} or {@link
* Type#TLOG} replicas. {@link Type#PULL} replicas can’t become shard
leaders (i.e., if there
* are only pull replicas in the collection at some point, updates will
fail same as if there is
* no leaders, queries continue to work), so they don’t even participate
in elections.
*/
- PULL(false);
+ PULL(false, CollectionAdminParams.PULL_REPLICAS);
public final boolean leaderEligible;
+ public final String numReplicasPropertyName;
- Type(boolean b) {
- this.leaderEligible = b;
+ Type(boolean leaderEligible, String numReplicasPropertyName) {
+ this.leaderEligible = leaderEligible;
+ this.numReplicasPropertyName = numReplicasPropertyName;
}
public static Type get(String name) {
return StrUtils.isNullOrEmpty(name) ? NRT :
Type.valueOf(name.toUpperCase(Locale.ROOT));
}
+
+ /**
+ * Returns a default replica type. It is most notably used by the replica
factor, which maps
+ * onto this replica type. This replica type needs to be leader-eligible.
+ */
+ public static Type defaultType() {
Review Comment:
Not sure to understand your comment. This currently mainly affects the
replica type impacted by the replication factor, or the default replica type if
none is explicitly specified. If we were to switch it dynamically to another
type (only TLOG is eligible as of now), that would change this.
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