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Posted to issues@bookkeeper.apache.org by GitBox <gi...@apache.org> on 2018/05/26 03:53:00 UTC
[GitHub] sijie closed pull request #1445: [table] mark TableClientTest &
TableClientSimpleTest as FlakyTest
sijie closed pull request #1445: [table] mark TableClientTest & TableClientSimpleTest as FlakyTest
URL: https://github.com/apache/bookkeeper/pull/1445
This is a PR merged from a forked repository.
As GitHub hides the original diff on merge, it is displayed below for
the sake of provenance:
As this is a foreign pull request (from a fork), the diff is supplied
below (as it won't show otherwise due to GitHub magic):
diff --git a/bookkeeper-server/src/test/java/org/apache/bookkeeper/test/annotations/FlakyTest.java b/bookkeeper-common/src/test/java/org/apache/bookkeeper/common/testing/annotations/FlakyTest.java
similarity index 95%
rename from bookkeeper-server/src/test/java/org/apache/bookkeeper/test/annotations/FlakyTest.java
rename to bookkeeper-common/src/test/java/org/apache/bookkeeper/common/testing/annotations/FlakyTest.java
index 2890f35c4..8240cf2d3 100644
--- a/bookkeeper-server/src/test/java/org/apache/bookkeeper/test/annotations/FlakyTest.java
+++ b/bookkeeper-common/src/test/java/org/apache/bookkeeper/common/testing/annotations/FlakyTest.java
@@ -15,7 +15,7 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
-package org.apache.bookkeeper.test.annotations;
+package org.apache.bookkeeper.common.testing.annotations;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
diff --git a/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/BookKeeperDiskSpaceWeightedLedgerPlacementTest.java b/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/BookKeeperDiskSpaceWeightedLedgerPlacementTest.java
index 72f7c5213..fec5dd84b 100644
--- a/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/BookKeeperDiskSpaceWeightedLedgerPlacementTest.java
+++ b/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/BookKeeperDiskSpaceWeightedLedgerPlacementTest.java
@@ -32,12 +32,12 @@
import org.apache.bookkeeper.bookie.Bookie;
import org.apache.bookkeeper.client.BookKeeper.DigestType;
+import org.apache.bookkeeper.common.testing.annotations.FlakyTest;
import org.apache.bookkeeper.conf.ClientConfiguration;
import org.apache.bookkeeper.conf.ServerConfiguration;
import org.apache.bookkeeper.net.BookieSocketAddress;
import org.apache.bookkeeper.proto.BookieServer;
import org.apache.bookkeeper.test.BookKeeperClusterTestCase;
-import org.apache.bookkeeper.test.annotations.FlakyTest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
diff --git a/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/BookieDecommissionTest.java b/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/BookieDecommissionTest.java
index 0e4928eda..b55a8c612 100644
--- a/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/BookieDecommissionTest.java
+++ b/bookkeeper-server/src/test/java/org/apache/bookkeeper/client/BookieDecommissionTest.java
@@ -29,10 +29,10 @@
import org.apache.bookkeeper.bookie.Bookie;
import org.apache.bookkeeper.client.BKException.BKIllegalOpException;
import org.apache.bookkeeper.client.BookKeeper.DigestType;
+import org.apache.bookkeeper.common.testing.annotations.FlakyTest;
import org.apache.bookkeeper.conf.ServerConfiguration;
import org.apache.bookkeeper.meta.ZkLedgerUnderreplicationManager;
import org.apache.bookkeeper.test.BookKeeperClusterTestCase;
-import org.apache.bookkeeper.test.annotations.FlakyTest;
import org.junit.Test;
/**
diff --git a/stream/distributedlog/common/src/main/java/org/apache/distributedlog/common/annotations/DistributedLogAnnotations.java b/stream/distributedlog/common/src/main/java/org/apache/distributedlog/common/annotations/DistributedLogAnnotations.java
index a5144b89f..c1de7f6a2 100644
--- a/stream/distributedlog/common/src/main/java/org/apache/distributedlog/common/annotations/DistributedLogAnnotations.java
+++ b/stream/distributedlog/common/src/main/java/org/apache/distributedlog/common/annotations/DistributedLogAnnotations.java
@@ -21,12 +21,6 @@
* Common annotation types.
*/
public class DistributedLogAnnotations {
- /**
- * Annotation to identify flaky tests in DistributedLog.
- * As and when we find that a test is flaky, we'll add this annotation to it for reference.
- */
- public @interface FlakyTest {}
-
/**
* Annotation to specify the occurrence of a compression operation. These are CPU intensive
* and should be avoided in low-latency paths.
diff --git a/stream/distributedlog/core/pom.xml b/stream/distributedlog/core/pom.xml
index 38937f490..8140eeab3 100644
--- a/stream/distributedlog/core/pom.xml
+++ b/stream/distributedlog/core/pom.xml
@@ -59,6 +59,13 @@
<artifactId>jmock</artifactId>
<scope>test</scope>
</dependency>
+ <dependency>
+ <groupId>org.apache.bookkeeper</groupId>
+ <artifactId>bookkeeper-common</artifactId>
+ <version>${project.version}</version>
+ <type>test-jar</type>
+ <scope>test</scope>
+ </dependency>
<dependency>
<groupId>org.apache.distributedlog</groupId>
<artifactId>distributedlog-common</artifactId>
diff --git a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestAsyncReaderWriter.java b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestAsyncReaderWriter.java
index 9c40834d0..75e22acfd 100644
--- a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestAsyncReaderWriter.java
+++ b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestAsyncReaderWriter.java
@@ -56,7 +56,6 @@
import org.apache.distributedlog.api.LogWriter;
import org.apache.distributedlog.api.namespace.Namespace;
import org.apache.distributedlog.api.namespace.NamespaceBuilder;
-import org.apache.distributedlog.common.annotations.DistributedLogAnnotations;
import org.apache.distributedlog.common.config.ConcurrentBaseConfiguration;
import org.apache.distributedlog.common.config.ConcurrentConstConfiguration;
import org.apache.distributedlog.config.DynamicDistributedLogConfiguration;
@@ -826,7 +825,6 @@ public void testSimpleAsyncReadWriteStartEmpty() throws Exception {
* Test Case: starting reading when the streams don't exist.
* {@link https://issues.apache.org/jira/browse/DL-42}
*/
- @DistributedLogAnnotations.FlakyTest
@Ignore
@Test(timeout = 120000)
public void testSimpleAsyncReadWriteStartEmptyFactory() throws Exception {
@@ -1505,7 +1503,6 @@ public void testReleaseLockAfterFailedToRecover() throws Exception {
dlm.close();
}
- @DistributedLogAnnotations.FlakyTest
@Test(timeout = 60000)
public void testAsyncReadMissingLogSegmentsNotification() throws Exception {
String name = "distrlog-async-reader-missing-zk-notification";
diff --git a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestNonBlockingReads.java b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestNonBlockingReads.java
index 4b17a1368..ef9f18450 100644
--- a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestNonBlockingReads.java
+++ b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestNonBlockingReads.java
@@ -30,7 +30,6 @@
import java.util.concurrent.TimeUnit;
import org.apache.distributedlog.api.DistributedLogManager;
import org.apache.distributedlog.api.LogReader;
-import org.apache.distributedlog.common.annotations.DistributedLogAnnotations;
import org.apache.distributedlog.exceptions.IdleReaderException;
import org.apache.distributedlog.util.Utils;
import org.junit.Assert;
@@ -42,7 +41,6 @@
/**
* {@link https://issues.apache.org/jira/browse/DL-12}.
*/
-@DistributedLogAnnotations.FlakyTest
@Ignore
public class TestNonBlockingReads extends TestDistributedLogBase {
static final Logger LOG = LoggerFactory.getLogger(TestNonBlockingReads.class);
diff --git a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestRollLogSegments.java b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestRollLogSegments.java
index 7a8d33c5a..a3a3f3467 100644
--- a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestRollLogSegments.java
+++ b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestRollLogSegments.java
@@ -33,7 +33,6 @@
import org.apache.bookkeeper.feature.SettableFeature;
import org.apache.distributedlog.api.DistributedLogManager;
import org.apache.distributedlog.api.LogReader;
-import org.apache.distributedlog.common.annotations.DistributedLogAnnotations.FlakyTest;
import org.apache.distributedlog.feature.CoreFeatureKeys;
import org.apache.distributedlog.impl.logsegment.BKLogSegmentEntryReader;
import org.apache.distributedlog.util.FailpointUtils;
@@ -42,10 +41,6 @@
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-
-
-
-
/**
* Test Cases for RollLogSegments.
*/
@@ -339,7 +334,6 @@ private void checkAndWaitWriterReaderPosition(BKLogSegmentWriter writer, long ex
assertEquals(expectedReaderPosition, readPosition.getEntryId());
}
- @FlakyTest
@Test(timeout = 60000)
@SuppressWarnings("deprecation")
public void testCaughtUpReaderOnLogSegmentRolling() throws Exception {
diff --git a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestZooKeeperClient.java b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestZooKeeperClient.java
index 0c8daad3b..022b02819 100644
--- a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestZooKeeperClient.java
+++ b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/TestZooKeeperClient.java
@@ -33,7 +33,6 @@
import org.apache.bookkeeper.zookeeper.BoundExponentialBackoffRetryPolicy;
import org.apache.distributedlog.ZooKeeperClient.Credentials;
import org.apache.distributedlog.ZooKeeperClient.DigestCredentials;
-import org.apache.distributedlog.common.annotations.DistributedLogAnnotations;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.WatchedEvent;
@@ -265,7 +264,6 @@ public void process(WatchedEvent event) {
/**
* {@link https://issues.apache.org/jira/browse/DL-34}.
*/
- @DistributedLogAnnotations.FlakyTest
@Ignore
@Test(timeout = 60000)
public void testAclAuthSpansExpiration() throws Exception {
@@ -290,7 +288,6 @@ public void testAclAuthSpansExpiration() throws Exception {
/**
* {@link https://issues.apache.org/jira/browse/DL-34}.
*/
- @DistributedLogAnnotations.FlakyTest
@Ignore
@Test(timeout = 60000)
public void testAclAuthSpansExpirationNonRetryableClient() throws Exception {
diff --git a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/admin/TestDistributedLogAdmin.java b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/admin/TestDistributedLogAdmin.java
index f5cd75e20..b48d002d4 100644
--- a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/admin/TestDistributedLogAdmin.java
+++ b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/admin/TestDistributedLogAdmin.java
@@ -23,6 +23,7 @@
import java.net.URI;
import java.util.concurrent.CompletableFuture;
+import org.apache.bookkeeper.common.testing.annotations.FlakyTest;
import org.apache.distributedlog.DLMTestUtil;
import org.apache.distributedlog.DLSN;
import org.apache.distributedlog.DistributedLogConfiguration;
@@ -35,7 +36,6 @@
import org.apache.distributedlog.api.DistributedLogManager;
import org.apache.distributedlog.api.namespace.Namespace;
import org.apache.distributedlog.api.namespace.NamespaceBuilder;
-import org.apache.distributedlog.common.annotations.DistributedLogAnnotations;
import org.apache.distributedlog.exceptions.UnexpectedException;
import org.apache.distributedlog.metadata.DryrunLogSegmentMetadataStoreUpdater;
import org.apache.distributedlog.metadata.LogSegmentMetadataStoreUpdater;
@@ -44,12 +44,9 @@
import org.apache.zookeeper.ZooDefs;
import org.junit.After;
import org.junit.Before;
-import org.junit.Ignore;
-import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-
/**
* TestDistributedLogAdmin.
*/
@@ -73,12 +70,7 @@ public void teardown() throws Exception {
zooKeeperClient.close();
}
- /**
- * {@link https://issues.apache.org/jira/browse/DL-44}.
- */
- @DistributedLogAnnotations.FlakyTest
- @Ignore
- @Test(timeout = 60000)
+ @FlakyTest("https://issues.apache.org/jira/browse/DL-44")
@SuppressWarnings("deprecation")
public void testChangeSequenceNumber() throws Exception {
DistributedLogConfiguration confLocal = new DistributedLogConfiguration();
diff --git a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/bk/TestLedgerAllocator.java b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/bk/TestLedgerAllocator.java
index 0270a4a3c..1786fe4e1 100644
--- a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/bk/TestLedgerAllocator.java
+++ b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/bk/TestLedgerAllocator.java
@@ -31,6 +31,7 @@
import org.apache.bookkeeper.client.BookKeeper;
import org.apache.bookkeeper.client.LedgerEntry;
import org.apache.bookkeeper.client.LedgerHandle;
+import org.apache.bookkeeper.common.testing.annotations.FlakyTest;
import org.apache.bookkeeper.versioning.LongVersion;
import org.apache.bookkeeper.versioning.Versioned;
import org.apache.distributedlog.BookKeeperClient;
@@ -41,7 +42,6 @@
import org.apache.distributedlog.ZooKeeperClient;
import org.apache.distributedlog.bk.SimpleLedgerAllocator.AllocationException;
import org.apache.distributedlog.bk.SimpleLedgerAllocator.Phase;
-import org.apache.distributedlog.common.annotations.DistributedLogAnnotations;
import org.apache.distributedlog.exceptions.ZKException;
import org.apache.distributedlog.util.Transaction.OpListener;
import org.apache.distributedlog.util.Utils;
@@ -54,7 +54,6 @@
import org.apache.zookeeper.data.Stat;
import org.junit.After;
import org.junit.Before;
-import org.junit.Ignore;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TestName;
@@ -125,12 +124,7 @@ private SimpleLedgerAllocator createAllocator(String allocationPath,
return Utils.ioResult(SimpleLedgerAllocator.of(allocationPath, null, newQuorumConfigProvider(conf), zkc, bkc));
}
- /**
- * {@link https://issues.apache.org/jira/browse/DL-43}.
- */
- @DistributedLogAnnotations.FlakyTest
- @Ignore
- @Test(timeout = 60000)
+ @FlakyTest("https://issues.apache.org/jira/browse/DL-43")
public void testAllocation() throws Exception {
String allocationPath = "/allocation1";
SimpleLedgerAllocator allocator = createAllocator(allocationPath);
@@ -310,12 +304,7 @@ public void testCloseAllocatorDuringObtaining() throws Exception {
dlConf.getBKDigestPW().getBytes(UTF_8));
}
- /**
- * {@link https://issues.apache.org/jira/browse/DL-26}.
- */
- @DistributedLogAnnotations.FlakyTest
- @Ignore
- @Test(timeout = 60000)
+ @FlakyTest("https://issues.apache.org/jira/browse/DL-26")
public void testCloseAllocatorAfterConfirm() throws Exception {
String allocationPath = "/allocation2";
SimpleLedgerAllocator allocator = createAllocator(allocationPath);
diff --git a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/feature/TestDynamicConfigurationFeatureProvider.java b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/feature/TestDynamicConfigurationFeatureProvider.java
index 536a6c017..e3953450b 100644
--- a/stream/distributedlog/core/src/test/java/org/apache/distributedlog/feature/TestDynamicConfigurationFeatureProvider.java
+++ b/stream/distributedlog/core/src/test/java/org/apache/distributedlog/feature/TestDynamicConfigurationFeatureProvider.java
@@ -21,16 +21,13 @@
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;
+import org.apache.bookkeeper.common.testing.annotations.FlakyTest;
import org.apache.bookkeeper.feature.Feature;
import org.apache.bookkeeper.stats.NullStatsLogger;
import org.apache.distributedlog.DistributedLogConfiguration;
-import org.apache.distributedlog.common.annotations.DistributedLogAnnotations;
import org.apache.distributedlog.common.config.PropertiesWriter;
-import org.junit.Ignore;
import org.junit.Test;
-
-
/**
* Test case for dynamic configuration based feature provider.
*/
@@ -79,12 +76,7 @@ public void testLoadFeaturesFromBase() throws Exception {
provider.stop();
}
- /**
- * {@link https://issues.apache.org/jira/browse/DL-40}.
- */
- @DistributedLogAnnotations.FlakyTest
- @Ignore
- @Test(timeout = 60000)
+ @FlakyTest("https://issues.apache.org/jira/browse/DL-40")
public void testLoadFeaturesFromOverlay() throws Exception {
PropertiesWriter writer = new PropertiesWriter();
writer.setProperty("feature_1", "10000");
diff --git a/tests/integration/cluster/pom.xml b/tests/integration/cluster/pom.xml
index 422269acb..b33b7ab36 100644
--- a/tests/integration/cluster/pom.xml
+++ b/tests/integration/cluster/pom.xml
@@ -51,6 +51,14 @@
<scope>test</scope>
</dependency>
+ <dependency>
+ <groupId>org.apache.bookkeeper</groupId>
+ <artifactId>bookkeeper-common</artifactId>
+ <version>${project.version}</version>
+ <type>test-jar</type>
+ <scope>test</scope>
+ </dependency>
+
</dependencies>
<build>
diff --git a/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/StorageAdminClientTest.java b/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/StorageAdminClientTest.java
index 4e39dfa8c..5aaf89e20 100644
--- a/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/StorageAdminClientTest.java
+++ b/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/StorageAdminClientTest.java
@@ -30,6 +30,7 @@
import org.apache.bookkeeper.clients.exceptions.StreamExistsException;
import org.apache.bookkeeper.clients.exceptions.StreamNotFoundException;
import org.apache.bookkeeper.common.concurrent.FutureUtils;
+import org.apache.bookkeeper.common.testing.annotations.FlakyTest;
import org.apache.bookkeeper.stream.proto.NamespaceConfiguration;
import org.apache.bookkeeper.stream.proto.NamespaceProperties;
import org.apache.bookkeeper.stream.proto.StreamConfiguration;
@@ -38,7 +39,6 @@
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
-import org.junit.Test;
import org.junit.rules.TestName;
/**
@@ -63,7 +63,7 @@ public void teardown() {
}
}
- @Test
+ @FlakyTest("https://github.com/apache/bookkeeper/issues/1440")
public void testNamespaceAPI() throws Exception {
// Create a namespace
String nsName = testName.getMethodName();
@@ -119,7 +119,7 @@ public void testNamespaceAPI() throws Exception {
}
}
- @Test
+ @FlakyTest("https://github.com/apache/bookkeeper/issues/1440")
public void testStreamAPI() throws Exception {
// Create a namespace
String nsName = testName.getMethodName() + "_ns";
diff --git a/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/TableClientSimpleTest.java b/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/TableClientSimpleTest.java
index d1ff09154..e88dfc384 100644
--- a/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/TableClientSimpleTest.java
+++ b/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/TableClientSimpleTest.java
@@ -40,6 +40,7 @@
import org.apache.bookkeeper.api.kv.result.KeyValue;
import org.apache.bookkeeper.clients.admin.StorageAdminClient;
import org.apache.bookkeeper.clients.config.StorageClientSettings;
+import org.apache.bookkeeper.common.testing.annotations.FlakyTest;
import org.apache.bookkeeper.stream.proto.NamespaceConfiguration;
import org.apache.bookkeeper.stream.proto.NamespaceProperties;
import org.apache.bookkeeper.stream.proto.StreamConfiguration;
@@ -47,7 +48,6 @@
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
-import org.junit.Test;
import org.junit.rules.TestName;
/**
@@ -89,7 +89,7 @@ private static ByteBuf getValue(int i) {
return Unpooled.wrappedBuffer(String.format("test-val-%06d", i).getBytes(UTF_8));
}
- @Test
+ @FlakyTest("https://github.com/apache/bookkeeper/issues/1440")
public void testTableSimpleAPI() throws Exception {
// Create a namespace
NamespaceConfiguration nsConf = NamespaceConfiguration.newBuilder()
diff --git a/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/TableClientTest.java b/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/TableClientTest.java
index 0dff7fa3a..6a287da42 100644
--- a/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/TableClientTest.java
+++ b/tests/integration/cluster/src/test/java/org/apache/bookkeeper/tests/integration/stream/TableClientTest.java
@@ -50,6 +50,7 @@
import org.apache.bookkeeper.clients.admin.StorageAdminClient;
import org.apache.bookkeeper.clients.config.StorageClientSettings;
import org.apache.bookkeeper.common.concurrent.FutureUtils;
+import org.apache.bookkeeper.common.testing.annotations.FlakyTest;
import org.apache.bookkeeper.stream.proto.NamespaceConfiguration;
import org.apache.bookkeeper.stream.proto.NamespaceProperties;
import org.apache.bookkeeper.stream.proto.StreamConfiguration;
@@ -57,7 +58,6 @@
import org.junit.After;
import org.junit.Before;
import org.junit.Rule;
-import org.junit.Test;
import org.junit.rules.TestName;
/**
@@ -100,7 +100,7 @@ private static ByteBuf getValue(int i) {
return Unpooled.wrappedBuffer(String.format("test-val-%06d", i).getBytes(UTF_8));
}
- @Test
+ @FlakyTest("https://github.com/apache/bookkeeper/issues/1440")
public void testTableAPI() throws Exception {
// Create a namespace
NamespaceConfiguration nsConf = NamespaceConfiguration.newBuilder()
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