tolbertam commented on code in PR #4304:
URL: https://github.com/apache/cassandra/pull/4304#discussion_r2296375066
##########
src/java/org/apache/cassandra/config/DatabaseDescriptor.java:
##########
@@ -5940,6 +5940,16 @@ public static void
setIncrementalRepairDiskHeadroomRejectRatio(double value)
conf.incremental_repair_disk_headroom_reject_ratio = value;
}
+ public static boolean getMixedMajorVersionRepairEnabled()
+ {
+ return conf.auto_repair.mixed_major_version_repair_enabled;
+ }
+
+ public static void setMixedMajorVersionRepairEnabled(boolean
mixed_major_version_repair_enabled)
+ {
+ conf.auto_repair.mixed_major_version_repair_enabled =
mixed_major_version_repair_enabled;
+ }
+
Review Comment:
It looks like we already have a
`AutoRepairConfig.isMixedMajorVersionRepairEnabled()` which is currently
unused. Since this is an `AutoRepair`-specific thing can we remove these
methods and use methods on `AutoRepairConfig` instead?
Would also be nice to update `SetAutoRepairConfig` to allow configuring this
value.
##########
test/unit/org/apache/cassandra/repair/autorepair/AutoRepairUtilsTest.java:
##########
@@ -232,6 +236,52 @@ public void testGetHostIdsInCurrentRing_multiple_nodes()
assertTrue(hosts.contains(hostId));
}
+ @Test
+ public void testHasMultipleLiveMajorVersionsWithSingleNode()
+ {
+ boolean result = AutoRepairUtils.hasMultipleLiveMajorVersions();
+ assertFalse(result);
+ }
+
+ @Test
+ public void
testHasMultipleLiveMajorVersionsWithMultipleNodesOfSameVersion()
+ {
+ ClusterMetadataTestHelper.addEndpoint(2);
+ // Test the current behavior with the existing cluster setup
+ // In a single-node test environment, this should return false
+ boolean result = AutoRepairUtils.hasMultipleLiveMajorVersions();
+ assertFalse(result);
+ }
+
+ @Test
+ public void
testHasMultipleLiveMajorVersionsWithMultipleNodesOfSameMajorVersionDifferentMinorVersions()
+ {
+ // add two nodes with cassandra 5 major version, but different minor
version
+ CassandraVersion differentCassandraVersion = new CassandraVersion(
+ String.format("%d.%d",
+ NodeVersion.CURRENT.cassandraVersion.major,
+ NodeVersion.CURRENT.cassandraVersion.minor+1));
+ ClusterMetadataTestHelper.addEndpoint(2, new NodeVersion(
+ differentCassandraVersion,
+ NodeVersion.CURRENT_METADATA_VERSION));
+ // With the same major versions, but different minor versions, we
should still see this function return true
+ boolean result = AutoRepairUtils.hasMultipleLiveMajorVersions();
+ assertFalse(result);
+ }
+
+ @Test
+ public void
testHasMultipleLiveMajorVersionsWithMultipleNodesOfDifferentMajorVersions()
+ {
+ // add two nodes with cassandra 5 major version, but different minor
version
Review Comment:
A bit pedantic I know, but in future the current major version will change.
```suggestion
// add two nodes with current cassandra major version, but different
minor version
```
##########
conf/cassandra.yaml:
##########
@@ -2779,6 +2779,9 @@ storage_compatibility_mode: NONE
# # for a specified duration to ensure they are indeed removed before
adjustments are made to the schedule.
# history_clear_delete_hosts_buffer_interval: 2h
# # NOTE: Each of the below settings can be overridden per repair type under
repair_type_overrides
+# # by default repair is disabled if there are mixed major versions detected
- which would happen
+# # if a major version upgrade is being performed on the cluster, but a user
can enable it using this flag
+# # mixed_major_version_repair_enabled = false;
Review Comment:
Small suggestions:
* Move `#NOTE: ...` to the line before `global_settings` as it makes more
sense to be proximate to there.
* Uncomment `mixed_major_version_repair_enabled = false` and remove
semi-colon.
```suggestion
# # by default repair is disabled if there are mixed major versions
detected - which would happen
# # if a major version upgrade is being performed on the cluster, but a
user can enable it using this flag
# mixed_major_version_repair_enabled = false
# # NOTE: Each of the below settings can be overridden per repair type
under repair_type_overrides
```
A couple of other things that would to be good to do:
1. Can you also add this to `cassandra_latest.yaml` as well?
2. Add to 'Top level settings' in auto_repair.adoc? In that file it would
also be good to expand on why repairs should not be run during major version
upgrades (previous slack thread about it:
https://the-asf.slack.com/archives/C06MR8K2Q0Z/p1729716524563759)
##########
test/distributed/org/apache/cassandra/distributed/test/log/ClusterMetadataTestHelper.java:
##########
@@ -798,19 +798,27 @@ public MoveProcess finishMove()
public static void addEndpoint(int i)
{
+ addEndpoint(i, NodeVersion.CURRENT);
+ }
+
+ public static void addEndpoint(int i, NodeVersion nodeVersion) {
try
Review Comment:
`{` on next line
```suggestion
public static void addEndpoint(int i, NodeVersion nodeVersion)
{
try
```
##########
test/distributed/org/apache/cassandra/distributed/test/log/ClusterMetadataTestHelper.java:
##########
@@ -798,19 +798,27 @@ public MoveProcess finishMove()
public static void addEndpoint(int i)
{
+ addEndpoint(i, NodeVersion.CURRENT);
+ }
+
+ public static void addEndpoint(int i, NodeVersion nodeVersion) {
try
{
- addEndpoint(InetAddressAndPort.getByName("127.0.0." + i), new
Murmur3Partitioner.LongToken(i));
+ addEndpoint(InetAddressAndPort.getByName("127.0.0." + i), new
Murmur3Partitioner.LongToken(i), nodeVersion);
}
catch (UnknownHostException e)
{
throw new RuntimeException(e);
}
}
- public static void addEndpoint(InetAddressAndPort endpoint, Token t)
+ public static void addEndpoint(InetAddressAndPort endpoint, Token t) {
+ addEndpoint(endpoint, t, NodeVersion.CURRENT);
Review Comment:
{ on next line:
```suggestion
public static void addEndpoint(InetAddressAndPort endpoint, Token t)
{
addEndpoint(endpoint, t, NodeVersion.CURRENT);
```
##########
src/java/org/apache/cassandra/repair/autorepair/AutoRepairUtils.java:
##########
@@ -425,6 +425,21 @@ public static CurrentRepairStatus
getCurrentRepairStatus(RepairType repairType,
return null;
}
+ /**
+ * Checks whether the cluster has multiple major versions
+ * @return
+ * true if more than one major versions are detected
+ * false if only one major version is detected
+ *
+ */
+ public static boolean hasMultipleLiveMajorVersions()
+ {
+ ClusterMetadata metadata = ClusterMetadata.current();
+ int maxMajorVersion =
ClusterMetadata.current().directory.clusterMaxVersion.cassandraVersion.major;
+ int minMajorVersion =
ClusterMetadata.current().directory.clusterMinVersion.cassandraVersion.major;
+ return maxMajorVersion != minMajorVersion;
+ }
+
Review Comment:
👍 nice and simple.
I had some doubts on whether this is sufficient given Cassandra's version
history. e.g. between 2.0 and 2.1 maybe this wouldn't be safe? But I'd hope
from C* 6.0 on this is probably sufficient.
##########
src/java/org/apache/cassandra/repair/autorepair/AutoRepair.java:
##########
@@ -165,6 +166,11 @@ public void repair(AutoRepairConfig.RepairType repairType)
logger.debug("Auto-repair is disabled for repair type {}",
repairType);
return;
}
+ if (!DatabaseDescriptor.getMixedMajorVersionRepairEnabled() &&
+ Gossiper.instance.hasMultipleLiveMajorVersions()) {
+ logger.info("Auto-repair is disabled when nodes in the cluster
have different major versions");
Review Comment:
I think the metrics are calculated off of / engaged by `AutoRepairState`
(accessed 2 lines below). You could add something to that. Curious on the
metric we are interested in adding? I'm guess maybe a `Counter` that
increments whenever repair is skipped because mixed versions are detected?
##########
test/unit/org/apache/cassandra/repair/autorepair/AutoRepairUtilsTest.java:
##########
@@ -232,6 +236,52 @@ public void testGetHostIdsInCurrentRing_multiple_nodes()
assertTrue(hosts.contains(hostId));
}
+ @Test
+ public void testHasMultipleLiveMajorVersionsWithSingleNode()
+ {
+ boolean result = AutoRepairUtils.hasMultipleLiveMajorVersions();
+ assertFalse(result);
+ }
+
+ @Test
+ public void
testHasMultipleLiveMajorVersionsWithMultipleNodesOfSameVersion()
+ {
+ ClusterMetadataTestHelper.addEndpoint(2);
+ // Test the current behavior with the existing cluster setup
+ // In a single-node test environment, this should return false
+ boolean result = AutoRepairUtils.hasMultipleLiveMajorVersions();
+ assertFalse(result);
+ }
+
+ @Test
+ public void
testHasMultipleLiveMajorVersionsWithMultipleNodesOfSameMajorVersionDifferentMinorVersions()
+ {
+ // add two nodes with cassandra 5 major version, but different minor
version
Review Comment:
```suggestion
// add two nodes with current cassandra major version, but different
minor version
```
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