HBASE-26474 Implement connection-level attributes (#4014)

Add support for `db.system`, `db.connection_string`, `db.user`.

Signed-off-by: Duo Zhang <zhangduo@apache.org>
Signed-off-by: Huaxiang Sun <huaxiangsun@apache.org>
Co-authored-by: Josh Elser <josh.elser@gmail.com>

hbase-client/src/main/java/org/apache/hadoop/hbase/client/AbstractRpcBasedConnectionRegistry.java

@@ -272,6 +272,11 @@ public CompletableFuture<ServerName> getActiveMaster() {
       getClass().getSimpleName() + ".getActiveMaster");
   }
 
+  @Override
+  public String getConnectionString() {
+    return "unimplemented";
+  }
+
   @Override
   public void close() {
     trace(() -> {

hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncConnectionImpl.java

@@ -71,7 +71,7 @@
  * The implementation of AsyncConnection.
  */
 @InterfaceAudience.Private
-class AsyncConnectionImpl implements AsyncConnection {
+public class AsyncConnectionImpl implements AsyncConnection {
 
   private static final Logger LOG = LoggerFactory.getLogger(AsyncConnectionImpl.class);
 
@@ -191,6 +191,14 @@ synchronized ChoreService getChoreService() {
     return choreService;
   }
 
+  public User getUser() {
+    return user;
+  }
+
+  public ConnectionRegistry getConnectionRegistry() {
+    return registry;
+  }
+
   @Override
   public Configuration getConfiguration() {
     return conf;

hbase-client/src/main/java/org/apache/hadoop/hbase/client/AsyncRegionLocator.java

@@ -1,4 +1,4 @@
-/**
+/*
  * 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
@@ -20,24 +20,27 @@
 import static org.apache.hadoop.hbase.TableName.META_TABLE_NAME;
 import static org.apache.hadoop.hbase.trace.HBaseSemanticAttributes.REGION_NAMES_KEY;
 import static org.apache.hadoop.hbase.trace.HBaseSemanticAttributes.SERVER_NAME_KEY;
-import static org.apache.hadoop.hbase.trace.TraceUtil.createSpan;
-import static org.apache.hadoop.hbase.trace.TraceUtil.createTableSpan;
 import static org.apache.hadoop.hbase.util.FutureUtils.addListener;
 
 import io.opentelemetry.api.trace.Span;
 import io.opentelemetry.api.trace.StatusCode;
 import io.opentelemetry.context.Scope;
-import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Function;
 import java.util.function.Supplier;
+import java.util.stream.Collectors;
 import org.apache.hadoop.hbase.HRegionLocation;
 import org.apache.hadoop.hbase.RegionLocations;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.trace.ConnectionSpanBuilder;
+import org.apache.hadoop.hbase.client.trace.TableSpanBuilder;
 import org.apache.hadoop.hbase.exceptions.TimeoutIOException;
 import org.apache.hadoop.hbase.trace.TraceUtil;
 import org.apache.hadoop.hbase.util.Bytes;
@@ -95,9 +98,12 @@ private boolean isMeta(TableName tableName) {
     return TableName.isMetaTableName(tableName);
   }
 
-  private <T> CompletableFuture<T> tracedLocationFuture(Supplier<CompletableFuture<T>> action,
-    Function<T, List<String>> getRegionNames, TableName tableName, String methodName) {
-    Span span = createTableSpan("AsyncRegionLocator." + methodName, tableName);
+  private <T> CompletableFuture<T> tracedLocationFuture(
+    Supplier<CompletableFuture<T>> action,
+    Function<T, List<String>> getRegionNames,
+    Supplier<Span> spanSupplier
+  ) {
+    final Span span = spanSupplier.get();
     try (Scope scope = span.makeCurrent()) {
       CompletableFuture<T> future = action.get();
       FutureUtils.addListener(future, (resp, error) -> {
@@ -116,18 +122,30 @@ private <T> CompletableFuture<T> tracedLocationFuture(Supplier<CompletableFuture
     }
   }
 
-  private List<String> getRegionName(RegionLocations locs) {
-    List<String> names = new ArrayList<>();
-    for (HRegionLocation loc : locs.getRegionLocations()) {
-      if (loc != null) {
-        names.add(loc.getRegion().getRegionNameAsString());
-      }
+  static List<String> getRegionNames(RegionLocations locs) {
+    if (locs == null || locs.getRegionLocations() == null) {
+      return Collections.emptyList();
     }
-    return names;
+    return Arrays.stream(locs.getRegionLocations())
+      .filter(Objects::nonNull)
+      .map(HRegionLocation::getRegion)
+      .map(RegionInfo::getRegionNameAsString)
+      .collect(Collectors.toList());
+  }
+
+  static List<String> getRegionNames(HRegionLocation location) {
+    return Optional.ofNullable(location)
+      .map(HRegionLocation::getRegion)
+      .map(RegionInfo::getRegionNameAsString)
+      .map(Collections::singletonList)
+      .orElseGet(Collections::emptyList);
   }
 
   CompletableFuture<RegionLocations> getRegionLocations(TableName tableName, byte[] row,
     RegionLocateType type, boolean reload, long timeoutNs) {
+    final Supplier<Span> supplier = new TableSpanBuilder(conn)
+      .setName("AsyncRegionLocator.getRegionLocations")
+      .setTableName(tableName);
     return tracedLocationFuture(() -> {
       CompletableFuture<RegionLocations> future = isMeta(tableName) ?
         metaRegionLocator.getRegionLocations(RegionReplicaUtil.DEFAULT_REPLICA_ID, reload) :
@@ -137,11 +155,14 @@ CompletableFuture<RegionLocations> getRegionLocations(TableName tableName, byte[
         () -> "Timeout(" + TimeUnit.NANOSECONDS.toMillis(timeoutNs) +
           "ms) waiting for region locations for " + tableName + ", row='" +
           Bytes.toStringBinary(row) + "'");
-    }, this::getRegionName, tableName, "getRegionLocations");
+    }, AsyncRegionLocator::getRegionNames, supplier);
   }
 
   CompletableFuture<HRegionLocation> getRegionLocation(TableName tableName, byte[] row,
     int replicaId, RegionLocateType type, boolean reload, long timeoutNs) {
+    final Supplier<Span> supplier = new TableSpanBuilder(conn)
+      .setName("AsyncRegionLocator.getRegionLocation")
+      .setTableName(tableName);
     return tracedLocationFuture(() -> {
       // meta region can not be split right now so we always call the same method.
       // Change it later if the meta table can have more than one regions.
@@ -172,8 +193,7 @@ CompletableFuture<HRegionLocation> getRegionLocation(TableName tableName, byte[]
         () -> "Timeout(" + TimeUnit.NANOSECONDS.toMillis(timeoutNs) +
           "ms) waiting for region location for " + tableName + ", row='" +
           Bytes.toStringBinary(row) + "', replicaId=" + replicaId);
-    }, loc -> Arrays.asList(loc.getRegion().getRegionNameAsString()), tableName,
-      "getRegionLocation");
+    }, AsyncRegionLocator::getRegionNames, supplier);
   }
 
   CompletableFuture<HRegionLocation> getRegionLocation(TableName tableName, byte[] row,
@@ -201,31 +221,38 @@ void updateCachedLocationOnError(HRegionLocation loc, Throwable exception) {
   }
 
   void clearCache(TableName tableName) {
+    Supplier<Span> supplier = new TableSpanBuilder(conn)
+      .setName("AsyncRegionLocator.clearCache")
+      .setTableName(tableName);
     TraceUtil.trace(() -> {
       LOG.debug("Clear meta cache for {}", tableName);
       if (tableName.equals(META_TABLE_NAME)) {
         metaRegionLocator.clearCache();
       } else {
         nonMetaRegionLocator.clearCache(tableName);
       }
-    }, () -> createTableSpan("AsyncRegionLocator.clearCache", tableName));
+    }, supplier);
   }
 
   void clearCache(ServerName serverName) {
+    Supplier<Span> supplier = new ConnectionSpanBuilder(conn)
+      .setName("AsyncRegionLocator.clearCache")
+      .addAttribute(SERVER_NAME_KEY, serverName.getServerName());
     TraceUtil.trace(() -> {
       LOG.debug("Clear meta cache for {}", serverName);
       metaRegionLocator.clearCache(serverName);
       nonMetaRegionLocator.clearCache(serverName);
       conn.getConnectionMetrics().ifPresent(MetricsConnection::incrMetaCacheNumClearServer);
-    }, () -> createSpan("AsyncRegionLocator.clearCache").setAttribute(SERVER_NAME_KEY,
-      serverName.getServerName()));
+    }, supplier);
   }
 
   void clearCache() {
+    Supplier<Span> supplier = new ConnectionSpanBuilder(conn)
+      .setName("AsyncRegionLocator.clearCache");
     TraceUtil.trace(() -> {
       metaRegionLocator.clearCache();
       nonMetaRegionLocator.clearCache();
-    }, "AsyncRegionLocator.clearCache");
+    }, supplier);
   }
 
   AsyncNonMetaRegionLocator getNonMetaRegionLocator() {

hbase-client/src/main/java/org/apache/hadoop/hbase/client/ClusterConnection.java

@@ -31,6 +31,7 @@
 import org.apache.hadoop.hbase.ZooKeeperConnectionException;
 import org.apache.hadoop.hbase.client.backoff.ClientBackoffPolicy;
 import org.apache.hadoop.hbase.ipc.RpcControllerFactory;
+import org.apache.hadoop.hbase.security.User;
 import org.apache.yetus.audience.InterfaceAudience;
 
 import org.apache.hadoop.hbase.shaded.protobuf.generated.AdminProtos.AdminService;
@@ -175,8 +176,7 @@ void updateCachedLocations(TableName tableName, byte[] regionName, byte[] rowkey
    *   question
    * @throws IOException if a remote or network exception occurs
    */
-  HRegionLocation locateRegion(final byte[] regionName)
-  throws IOException;
+  HRegionLocation locateRegion(final byte[] regionName) throws IOException;
 
   /**
    * Gets the locations of all regions in the specified table, <i>tableName</i>.
@@ -335,4 +335,14 @@ List<ServerName> getLiveRegionServers(Supplier<ServerName> masterAddrTracker, in
    * Get the bootstrap node list of another region server.
    */
   List<ServerName> getAllBootstrapNodes(ServerName regionServer) throws IOException;
+
+  /**
+   * Get the {@link User} associated with this connection. May be {@code null}.
+   */
+  User getUser();
+
+  /**
+   * Get the {@link ConnectionRegistry} used to orient this cluster.
+   */
+  ConnectionRegistry getConnectionRegistry();
 }

hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionImplementation.java

@@ -166,7 +166,7 @@
     value="AT_OPERATION_SEQUENCE_ON_CONCURRENT_ABSTRACTION",
     justification="Access to the conncurrent hash map is under a lock so should be fine.")
 @InterfaceAudience.Private
-class ConnectionImplementation implements ClusterConnection, Closeable {
+public class ConnectionImplementation implements ClusterConnection, Closeable {
   public static final String RETRIES_BY_SERVER_KEY = "hbase.client.retries.by.server";
   private static final Logger LOG = LoggerFactory.getLogger(ConnectionImplementation.class);
 
@@ -513,6 +513,16 @@ public MetricsConnection getConnectionMetrics() {
     return this.metrics;
   }
 
+  @Override
+  public User getUser() {
+    return user;
+  }
+
+  @Override
+  public ConnectionRegistry getConnectionRegistry() {
+    return registry;
+  }
+
   private ThreadPoolExecutor getBatchPool() {
     if (batchPool == null) {
       synchronized (this) {

hbase-client/src/main/java/org/apache/hadoop/hbase/client/ConnectionRegistry.java

@@ -29,7 +29,7 @@
  * Internal use only.
  */
 @InterfaceAudience.Private
-interface ConnectionRegistry extends Closeable {
+public interface ConnectionRegistry extends Closeable {
 
   /**
    * Get the location of meta region(s).
@@ -48,6 +48,13 @@ interface ConnectionRegistry extends Closeable {
    */
   CompletableFuture<ServerName> getActiveMaster();
 
+  /**
+   * Return the connection string associated with this registry instance. This value is
+   * informational, used for annotating traces. Values returned may not be valid for establishing a
+   * working cluster connection.
+   */
+  String getConnectionString();
+
   /**
    * Closes this instance and releases any system resources associated with it
    */