sk0x50 commented on a change in pull request #394:
URL: https://github.com/apache/ignite-3/pull/394#discussion_r727191016
##########
File path:
examples/src/main/java/org/apache/ignite/example/rebalance/RebalanceExample.java
##########
@@ -19,56 +19,62 @@
import java.nio.file.Files;
import java.nio.file.Path;
-import java.util.ArrayList;
-import java.util.List;
import java.util.Set;
import org.apache.ignite.Ignite;
import org.apache.ignite.IgnitionManager;
+import org.apache.ignite.client.IgniteClient;
import
org.apache.ignite.internal.schema.configuration.SchemaConfigurationConverter;
import org.apache.ignite.schema.SchemaBuilders;
import org.apache.ignite.schema.definition.ColumnType;
import org.apache.ignite.schema.definition.TableDefinition;
import org.apache.ignite.table.KeyValueView;
-import org.apache.ignite.table.Table;
import org.apache.ignite.table.Tuple;
/**
* This example demonstrates the data rebalance process.
- * The following sequence of events is emulated:
- *
- * <ul>
- * <li>Start 3 nodes (A, B and C)</li>
- * <li>Insert some data</li>
- * <li>Add 2 more nodes (D and E)</li>
- * <li>Set new baseline to (A, D, E)</li>
- * <li>Stop nodes B and C</li>
- * <li>Check that data is still available on the new configuration</li>
- * </ul>
- *
+ * <p>
+ * The example emulates the basic scenario when one starts a three-node
topology,
+ * inserts some data, and then scales out by adding two more nodes. After the
+ * topology is changed, the data is rebalanced and verified for correctness.
* <p>
* To run the example, do the following:
* <ol>
* <li>Import the examples project into you IDE.</li>
+ * <li>
+ * Start <b>two</b> nodes using the CLI tool:<br>
+ * {@code ignite node start
--config=$IGNITE_HOME/examples/config/ignite-config.json my-first-node}<br>
+ * {@code ignite node start
--config=$IGNITE_HOME/examples/config/ignite-config.json my-second-node}
+ * </li>
* <li>Run the example in the IDE.</li>
+ * <li>
+ * When requested, start another two nodes using the CLI tool:
+ * {@code ignite node start
--config=$IGNITE_HOME/examples/config/ignite-config.json
my-first-additional-node}<br>
+ * {@code ignite node start
--config=$IGNITE_HOME/examples/config/ignite-config.json
my-second-additional-node}
+ * </li>
+ * <li>Press {@code Enter} to resume the example.</li>
* </ol>
*/
public class RebalanceExample {
public static void main(String[] args) throws Exception {
- List<Ignite> nodes = new ArrayList<>();
-
- try {
- System.out.println("Starting server nodes... Logging to file:
ignite.log");
-
- System.setProperty("java.util.logging.config.file",
"config/java.util.logging.properties");
-
- for (int i = 0; i < 3; i++) {
- nodes.add(IgnitionManager.start("node-" + i,
- Files.readString(Path.of("config", "rebalance",
"ignite-config-" + i + ".json")),
- Path.of("work" + i)));
- }
-
- Ignite node0 = nodes.get(0);
-
+
//--------------------------------------------------------------------------------------
+ //
+ // Starting a server node.
+ //
+ // NOTE: An embedded server node is only needed to invoke the
'createTable' API.
+ // In the future releases, this API will be available on the
client,
+ // eliminating the need to start an embedded server node in this
example.
+ //
+
//--------------------------------------------------------------------------------------
+
+ System.out.println("Starting a server node... Logging to file:
ignite.log");
Review comment:
```suggestion
System.out.println("Starting a server node... Logging to file:
example-node.log");
```
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