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Posted to pr@cassandra.apache.org by GitBox <gi...@apache.org> on 2022/01/05 22:35:04 UTC
[GitHub] [cassandra] frankgh opened a new pull request #1376: CASSANDRA-17226: Consistency Level Considered Connectivity Checker
frankgh opened a new pull request #1376:
URL: https://github.com/apache/cassandra/pull/1376
This commit introduces two main features:
1. The ability to provide a custom implementation of the `StartupConnectivityChecker`
2. The `ConsistencyLevelStartupConnectivityChecker` checker
In `cassandra.yaml`, a custom implementation of the `StartupConnectivityChecker` can be
specified by providing the fully qualified class name by setting the `startup_connectivity_checker`
property in the yaml file. Additionally, the property supports the existing implementation
of the checker: `StrictStartupConnectivityChecker` (the default); and a new implementation
of the checker called the `ConsistencyLevelStartupConnectivityChecker`.
The current implementation of the `StartupConnectivityChecker` (the default) ensures that
all-but-one peers in each datacenter are available during Cassandra startup. We call this
implementation the strict implementation (`StrictStartupConnectivityChecker`). It is a
strict implemetation because it requires all-but-one of the peers are available during
cluster startup.
The Consistency Level Considered implementation of the checker borrows the concept of the
`ConsistencyLevel` to determine the number of peer connections required during startup.
The lowest non-zero replication factor among all user keyspaces is used to determine the
quorum.
The checker breaks the check into 2 phases:
1. In phase one, it checks if the primary set of peers has connected.
2. In phase two, if primary peers have not yet responded then it sends additional ping messages
to the rest of the peers and checks if the connected peers can satisfy the specified
consistency level.
The checker supports the following values for `ConsistencyLevel`:
- ALL: all peers are required for the checks
- QUORUM: primary peers required for quorum are used for the checks
- LOCAL_QUORUM: primary peers in the local DC required for local quorum are used for the checks
- EACH_QUORUM: quorum in each DC is required for the primary peers
The default consistency level is `LOCAL_QUORUM` and this value can be configured in
`cassandra.yaml` by specifying the `block_for_peers_consistency_level` property. The
checker reuses the original `block_for_peers_timeout_in_secs` property to determine
how long the node will wait to connect to other peers.
The cheker only supports the `NetworkTopologyStrategy`. The checker is not suitable
when using vnodes.
Co-authored-by: Yifan Cai <yi...@apple.com>
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[GitHub] [cassandra] clohfink commented on a change in pull request #1376: CASSANDRA-17226: Consistency Level Considered Connectivity Checker
Posted by GitBox <gi...@apache.org>.
clohfink commented on a change in pull request #1376:
URL: https://github.com/apache/cassandra/pull/1376#discussion_r793003967
##########
File path: src/java/org/apache/cassandra/config/DatabaseDescriptor.java
##########
@@ -1042,6 +1059,52 @@ public static void applySslContext()
}
}
+ public static void applyStartupConnectivityChecker()
+ {
+ applyStartupConnectivityChecker(conf);
+ }
+
+ @VisibleForTesting
+ static void applyStartupConnectivityChecker(Config conf)
+ {
+ StartupConnectivityChecker startupConnectivityChecker;
+
+ /* Startup cluster connectivity checker backend, implementing StartupClusterConnectivityChecker */
+ if (conf.startup_connectivity_checker != null)
+ {
+ // A ConfigurationException is thrown if the class is not found
+ startupConnectivityChecker = FBUtilities.newStartupConnectivityChecker(conf.startup_connectivity_checker);
+ }
+ else
+ {
+ startupConnectivityChecker = new StrictStartupConnectivityChecker();
+ }
+
+ // the configuration option block_for_peers_in_remote_dcs is only guaranteed
+ // to work with StrictStartupClusterConnectivityChecker, so log a message if
+ // some other startup cluster connectivity checker is in use and the non-default
+ // value is detected
+ if (!(startupConnectivityChecker instanceof StrictStartupConnectivityChecker)
Review comment:
instead of tying this logic in DD, can add a `validate` method to `StartupConnectivityChecker` with the config allowing it to log warnings or fail. This also means any custom implementation can have checks.
##########
File path: src/java/org/apache/cassandra/net/ConsistencyLevelStartupConnectivityChecker.java
##########
@@ -0,0 +1,442 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.cassandra.net;
+
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
+import java.util.function.ToIntFunction;
+import java.util.stream.Stream;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Multimap;
+
+import org.apache.cassandra.config.DatabaseDescriptor;
+import org.apache.cassandra.db.ConsistencyLevel;
+import org.apache.cassandra.dht.Token;
+import org.apache.cassandra.locator.InetAddressAndPort;
+import org.apache.cassandra.locator.NetworkTopologyStrategy;
+import org.apache.cassandra.schema.Schema;
+import org.apache.cassandra.service.StorageService;
+import org.apache.cassandra.utils.concurrent.CountDownLatch;
+
+import static java.util.stream.Collectors.groupingBy;
+import static org.apache.cassandra.utils.concurrent.CountDownLatch.newCountDownLatch;
+
+
+/**
+ * A {@link StartupConnectivityChecker} implementation that based on the configured {@link ConsistencyLevel} to
+ * determine how many peers in the local datacenter or all datacenters to wait for before it is ready to advertise to clients.
+ * The lowest non-zero replication factor among all user keyspaces is used to determine the quorum.
+ *
+ * <p>The checker breaks the check into 2 phases.
+ * 1. In phase one, it checks if the primary set of peers has connected.
+ * 2. In phase two, it sends additional ping messages to the rest of the peers and check if the connected peers can satisfy
+ * the specified consistency level at the end.
+ *
+ * <p>Supported values for {@code blockForPeersConsistencyLevel} are:
+ * <ul>
+ * <li>ALL
+ * <li>QUORUM
+ * <li>LOCAL_QUORUM
+ * <li>EACH_QUORUM
+ * </ul>
+ *
+ * <p>The checker only supports the {@link NetworkTopologyStrategy}. The checker is not suitable when using vnodes.
+ */
+public class ConsistencyLevelStartupConnectivityChecker
+extends AbstractStartupConnectivityChecker
+{
Review comment:
At a high level, I think a lot of this logic is replicated in the ReplicaPlan stuff that is used by the Read/Writes already. (hence will accurately reflect if they will throw UnavailableExceptions). Can we use this directly and cut almost all this logic? ie:
``` while (System.currentTimeMillis() < timeout)
{
boolean allGood = true;
// different RFs
for (Keyspace keyspace : Keyspace.all())
{
for (TableMetadata table : keyspace.getMetadata().tables)
{
allGood &= RangeCommands.sufficientLiveNodesForSelectStar(table, consistencyLevel);
}
}
if (allGood) break;
sleep(1000);
}
##########
File path: src/java/org/apache/cassandra/net/ConsistencyLevelStartupConnectivityChecker.java
##########
@@ -0,0 +1,442 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.cassandra.net;
+
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
+import java.util.function.ToIntFunction;
+import java.util.stream.Stream;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Multimap;
+
+import org.apache.cassandra.config.DatabaseDescriptor;
+import org.apache.cassandra.db.ConsistencyLevel;
+import org.apache.cassandra.dht.Token;
+import org.apache.cassandra.locator.InetAddressAndPort;
+import org.apache.cassandra.locator.NetworkTopologyStrategy;
+import org.apache.cassandra.schema.Schema;
+import org.apache.cassandra.service.StorageService;
+import org.apache.cassandra.utils.concurrent.CountDownLatch;
+
+import static java.util.stream.Collectors.groupingBy;
+import static org.apache.cassandra.utils.concurrent.CountDownLatch.newCountDownLatch;
+
+
+/**
+ * A {@link StartupConnectivityChecker} implementation that based on the configured {@link ConsistencyLevel} to
+ * determine how many peers in the local datacenter or all datacenters to wait for before it is ready to advertise to clients.
+ * The lowest non-zero replication factor among all user keyspaces is used to determine the quorum.
+ *
+ * <p>The checker breaks the check into 2 phases.
+ * 1. In phase one, it checks if the primary set of peers has connected.
+ * 2. In phase two, it sends additional ping messages to the rest of the peers and check if the connected peers can satisfy
+ * the specified consistency level at the end.
+ *
+ * <p>Supported values for {@code blockForPeersConsistencyLevel} are:
+ * <ul>
+ * <li>ALL
+ * <li>QUORUM
+ * <li>LOCAL_QUORUM
+ * <li>EACH_QUORUM
+ * </ul>
+ *
+ * <p>The checker only supports the {@link NetworkTopologyStrategy}. The checker is not suitable when using vnodes.
+ */
+public class ConsistencyLevelStartupConnectivityChecker
+extends AbstractStartupConnectivityChecker
Review comment:
NP: dont place implements/extends on new lines
##########
File path: src/java/org/apache/cassandra/config/DatabaseDescriptor.java
##########
@@ -18,9 +18,21 @@
package org.apache.cassandra.config;
import java.io.IOException;
-import java.net.*;
+import java.net.Inet4Address;
Review comment:
NP: maybe dont explode these out, next persons pr might fold them back up.
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[GitHub] [cassandra] frankgh commented on a change in pull request #1376: CASSANDRA-17226: Consistency Level Considered Connectivity Checker
Posted by GitBox <gi...@apache.org>.
frankgh commented on a change in pull request #1376:
URL: https://github.com/apache/cassandra/pull/1376#discussion_r793103919
##########
File path: src/java/org/apache/cassandra/config/DatabaseDescriptor.java
##########
@@ -1042,6 +1059,52 @@ public static void applySslContext()
}
}
+ public static void applyStartupConnectivityChecker()
+ {
+ applyStartupConnectivityChecker(conf);
+ }
+
+ @VisibleForTesting
+ static void applyStartupConnectivityChecker(Config conf)
+ {
+ StartupConnectivityChecker startupConnectivityChecker;
+
+ /* Startup cluster connectivity checker backend, implementing StartupClusterConnectivityChecker */
+ if (conf.startup_connectivity_checker != null)
+ {
+ // A ConfigurationException is thrown if the class is not found
+ startupConnectivityChecker = FBUtilities.newStartupConnectivityChecker(conf.startup_connectivity_checker);
+ }
+ else
+ {
+ startupConnectivityChecker = new StrictStartupConnectivityChecker();
+ }
+
+ // the configuration option block_for_peers_in_remote_dcs is only guaranteed
+ // to work with StrictStartupClusterConnectivityChecker, so log a message if
+ // some other startup cluster connectivity checker is in use and the non-default
+ // value is detected
+ if (!(startupConnectivityChecker instanceof StrictStartupConnectivityChecker)
Review comment:
Found it: https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/auth/AuthConfig.java#L63
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[GitHub] [cassandra] frankgh commented on a change in pull request #1376: CASSANDRA-17226: Consistency Level Considered Connectivity Checker
Posted by GitBox <gi...@apache.org>.
frankgh commented on a change in pull request #1376:
URL: https://github.com/apache/cassandra/pull/1376#discussion_r793099514
##########
File path: src/java/org/apache/cassandra/config/DatabaseDescriptor.java
##########
@@ -1042,6 +1059,52 @@ public static void applySslContext()
}
}
+ public static void applyStartupConnectivityChecker()
+ {
+ applyStartupConnectivityChecker(conf);
+ }
+
+ @VisibleForTesting
+ static void applyStartupConnectivityChecker(Config conf)
+ {
+ StartupConnectivityChecker startupConnectivityChecker;
+
+ /* Startup cluster connectivity checker backend, implementing StartupClusterConnectivityChecker */
+ if (conf.startup_connectivity_checker != null)
+ {
+ // A ConfigurationException is thrown if the class is not found
+ startupConnectivityChecker = FBUtilities.newStartupConnectivityChecker(conf.startup_connectivity_checker);
+ }
+ else
+ {
+ startupConnectivityChecker = new StrictStartupConnectivityChecker();
+ }
+
+ // the configuration option block_for_peers_in_remote_dcs is only guaranteed
+ // to work with StrictStartupClusterConnectivityChecker, so log a message if
+ // some other startup cluster connectivity checker is in use and the non-default
+ // value is detected
+ if (!(startupConnectivityChecker instanceof StrictStartupConnectivityChecker)
Review comment:
so `validate` wouldn't make sense, since we are validating that other implementations are not using configuration properties intended for a different use case.
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[GitHub] [cassandra] frankgh commented on a change in pull request #1376: CASSANDRA-17226: Consistency Level Considered Connectivity Checker
Posted by GitBox <gi...@apache.org>.
frankgh commented on a change in pull request #1376:
URL: https://github.com/apache/cassandra/pull/1376#discussion_r804310155
##########
File path: src/java/org/apache/cassandra/net/ConsistencyLevelStartupConnectivityChecker.java
##########
@@ -0,0 +1,442 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.cassandra.net;
+
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.EnumSet;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.concurrent.TimeUnit;
+import java.util.function.Function;
+import java.util.function.ToIntFunction;
+import java.util.stream.Stream;
+
+import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ArrayListMultimap;
+import com.google.common.collect.Multimap;
+
+import org.apache.cassandra.config.DatabaseDescriptor;
+import org.apache.cassandra.db.ConsistencyLevel;
+import org.apache.cassandra.dht.Token;
+import org.apache.cassandra.locator.InetAddressAndPort;
+import org.apache.cassandra.locator.NetworkTopologyStrategy;
+import org.apache.cassandra.schema.Schema;
+import org.apache.cassandra.service.StorageService;
+import org.apache.cassandra.utils.concurrent.CountDownLatch;
+
+import static java.util.stream.Collectors.groupingBy;
+import static org.apache.cassandra.utils.concurrent.CountDownLatch.newCountDownLatch;
+
+
+/**
+ * A {@link StartupConnectivityChecker} implementation that based on the configured {@link ConsistencyLevel} to
+ * determine how many peers in the local datacenter or all datacenters to wait for before it is ready to advertise to clients.
+ * The lowest non-zero replication factor among all user keyspaces is used to determine the quorum.
+ *
+ * <p>The checker breaks the check into 2 phases.
+ * 1. In phase one, it checks if the primary set of peers has connected.
+ * 2. In phase two, it sends additional ping messages to the rest of the peers and check if the connected peers can satisfy
+ * the specified consistency level at the end.
+ *
+ * <p>Supported values for {@code blockForPeersConsistencyLevel} are:
+ * <ul>
+ * <li>ALL
+ * <li>QUORUM
+ * <li>LOCAL_QUORUM
+ * <li>EACH_QUORUM
+ * </ul>
+ *
+ * <p>The checker only supports the {@link NetworkTopologyStrategy}. The checker is not suitable when using vnodes.
+ */
+public class ConsistencyLevelStartupConnectivityChecker
+extends AbstractStartupConnectivityChecker
+{
Review comment:
Thanks for your review @clohfink. The drawback with this approach is that it does not establish small/large connections for the checks. Without those checks, we can only prevent unavailables and not timeouts.
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[GitHub] [cassandra] clohfink commented on a change in pull request #1376: CASSANDRA-17226: Consistency Level Considered Connectivity Checker
Posted by GitBox <gi...@apache.org>.
clohfink commented on a change in pull request #1376:
URL: https://github.com/apache/cassandra/pull/1376#discussion_r793707414
##########
File path: src/java/org/apache/cassandra/config/DatabaseDescriptor.java
##########
@@ -1042,6 +1059,52 @@ public static void applySslContext()
}
}
+ public static void applyStartupConnectivityChecker()
+ {
+ applyStartupConnectivityChecker(conf);
+ }
+
+ @VisibleForTesting
+ static void applyStartupConnectivityChecker(Config conf)
+ {
+ StartupConnectivityChecker startupConnectivityChecker;
+
+ /* Startup cluster connectivity checker backend, implementing StartupClusterConnectivityChecker */
+ if (conf.startup_connectivity_checker != null)
+ {
+ // A ConfigurationException is thrown if the class is not found
+ startupConnectivityChecker = FBUtilities.newStartupConnectivityChecker(conf.startup_connectivity_checker);
+ }
+ else
+ {
+ startupConnectivityChecker = new StrictStartupConnectivityChecker();
+ }
+
+ // the configuration option block_for_peers_in_remote_dcs is only guaranteed
+ // to work with StrictStartupClusterConnectivityChecker, so log a message if
+ // some other startup cluster connectivity checker is in use and the non-default
+ // value is detected
+ if (!(startupConnectivityChecker instanceof StrictStartupConnectivityChecker)
Review comment:
I still think the StrictStartupConnectivityChecker validates could just confirm that the settings are not made for different checkers inside of it. But fair enough
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[GitHub] [cassandra] frankgh commented on a change in pull request #1376: CASSANDRA-17226: Consistency Level Considered Connectivity Checker
Posted by GitBox <gi...@apache.org>.
frankgh commented on a change in pull request #1376:
URL: https://github.com/apache/cassandra/pull/1376#discussion_r793099116
##########
File path: src/java/org/apache/cassandra/config/DatabaseDescriptor.java
##########
@@ -1042,6 +1059,52 @@ public static void applySslContext()
}
}
+ public static void applyStartupConnectivityChecker()
+ {
+ applyStartupConnectivityChecker(conf);
+ }
+
+ @VisibleForTesting
+ static void applyStartupConnectivityChecker(Config conf)
+ {
+ StartupConnectivityChecker startupConnectivityChecker;
+
+ /* Startup cluster connectivity checker backend, implementing StartupClusterConnectivityChecker */
+ if (conf.startup_connectivity_checker != null)
+ {
+ // A ConfigurationException is thrown if the class is not found
+ startupConnectivityChecker = FBUtilities.newStartupConnectivityChecker(conf.startup_connectivity_checker);
+ }
+ else
+ {
+ startupConnectivityChecker = new StrictStartupConnectivityChecker();
+ }
+
+ // the configuration option block_for_peers_in_remote_dcs is only guaranteed
+ // to work with StrictStartupClusterConnectivityChecker, so log a message if
+ // some other startup cluster connectivity checker is in use and the non-default
+ // value is detected
+ if (!(startupConnectivityChecker instanceof StrictStartupConnectivityChecker)
Review comment:
This is warning the user that the properties specific for the `StrictStartupConnectivityChecker` are not unintentionally being configured with a different `startupConnectivityChecker`. So it's basically saying "hey, you changed the default value of this configuration property that is intended for a different startup checker than the one you are using". It's a pattern I saw somewhere else in this codebase, I will try to find where exactly that is being used.
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