HDFS-17529. RBF: Improve router state store cache entry deletion (#6833)

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/CachedRecordStore.java

@@ -21,6 +21,7 @@
 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Map;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReadWriteLock;
 import java.util.concurrent.locks.ReentrantReadWriteLock;
@@ -172,7 +173,7 @@ private boolean isUpdateTime() {
    */
   public void overrideExpiredRecords(QueryResult<R> query) throws IOException {
     List<R> commitRecords = new ArrayList<>();
-    List<R> deleteRecords = new ArrayList<>();
+    List<R> toDeleteRecords = new ArrayList<>();
     List<R> newRecords = query.getRecords();
     long currentDriverTime = query.getTimestamp();
     if (newRecords == null || currentDriverTime <= 0) {
@@ -182,13 +183,8 @@ public void overrideExpiredRecords(QueryResult<R> query) throws IOException {
     for (R record : newRecords) {
       if (record.shouldBeDeleted(currentDriverTime)) {
         String recordName = StateStoreUtils.getRecordName(record.getClass());
-        if (getDriver().remove(record)) {
-          deleteRecords.add(record);
-          LOG.info("Deleted State Store record {}: {}", recordName, record);
-        } else {
-          LOG.warn("Couldn't delete State Store record {}: {}", recordName,
-              record);
-        }
+        LOG.info("State Store record to delete {}: {}", recordName, record);
+        toDeleteRecords.add(record);
       } else if (!record.isExpired() && record.checkExpired(currentDriverTime)) {
         String recordName = StateStoreUtils.getRecordName(record.getClass());
         LOG.info("Override State Store record {}: {}", recordName, record);
@@ -198,8 +194,12 @@ public void overrideExpiredRecords(QueryResult<R> query) throws IOException {
     if (commitRecords.size() > 0) {
       getDriver().putAll(commitRecords, true, false);
     }
-    if (deleteRecords.size() > 0) {
-      newRecords.removeAll(deleteRecords);
+    if (!toDeleteRecords.isEmpty()) {
+      for (Map.Entry<R, Boolean> entry : getDriver().removeMultiple(toDeleteRecords).entrySet()) {
+        if (entry.getValue()) {
+          newRecords.remove(entry.getKey());
+        }
+      }
     }
   }
 

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/driver/StateStoreRecordOperations.java

@@ -19,6 +19,7 @@
 
 import java.io.IOException;
 import java.util.List;
+import java.util.Map;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -127,6 +128,17 @@ <T extends BaseRecord> StateStoreOperationResult putAll(
   @AtMostOnce
   <T extends BaseRecord> boolean remove(T record) throws IOException;
 
+  /**
+   * Remove multiple records.
+   *
+   * @param <T> Record class of the records.
+   * @param records Records to be removed.
+   * @return Map of record to a boolean indicating if the record has being removed successfully.
+   * @throws IOException Throws exception if unable to query the data store.
+   */
+  @AtMostOnce
+  <T extends BaseRecord> Map<T, Boolean> removeMultiple(List<T> records) throws IOException;
+
   /**
    * Remove all records of this class from the store.
    *
@@ -152,4 +164,17 @@ <T extends BaseRecord> StateStoreOperationResult putAll(
   <T extends BaseRecord> int remove(Class<T> clazz, Query<T> query)
       throws IOException;
 
+  /**
+   * Remove all records of a specific class that match any query in a list of queries.
+   * Requires the getAll implementation to fetch fresh records on each call.
+   *
+   * @param clazz The class to match the records with.
+   * @param queries Queries (logical OR) to filter what to remove.
+   * @param <T> Record class of the records.
+   * @return Map of query to number of records removed by that query.
+   * @throws IOException Throws exception if unable to query the data store.
+   */
+  @AtMostOnce
+  <T extends BaseRecord> Map<Query<T>, Integer> remove(Class<T> clazz, List<Query<T>> queries)
+      throws IOException;
 }

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/driver/impl/StateStoreBaseImpl.java

@@ -21,7 +21,10 @@
 
 import java.io.IOException;
 import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
 
 import org.apache.hadoop.classification.InterfaceAudience;
 import org.apache.hadoop.classification.InterfaceStability;
@@ -86,4 +89,37 @@ public <T extends BaseRecord> boolean remove(T record) throws IOException {
     Class<T> recordClass = (Class<T>)StateStoreUtils.getRecordClass(clazz);
     return remove(recordClass, query) == 1;
   }
+
+  @Override
+  public <T extends BaseRecord> Map<T, Boolean> removeMultiple(List<T> records) throws IOException {
+    assert !records.isEmpty();
+    // Fall back to iterative remove() calls if all records don't share 1 class
+    Class<? extends BaseRecord> expectedClazz = records.get(0).getClass();
+    if (!records.stream().allMatch(x -> x.getClass() == expectedClazz)) {
+      Map<T, Boolean> result = new HashMap<>();
+      for (T record : records) {
+        result.put(record, remove(record));
+      }
+      return result;
+    }
+
+    final List<Query<T>> queries = new ArrayList<>();
+    for (T record : records) {
+      queries.add(new Query<>(record));
+    }
+    @SuppressWarnings("unchecked")
+    Class<T> recordClass = (Class<T>) StateStoreUtils.getRecordClass(expectedClazz);
+    Map<Query<T>, Integer> result = remove(recordClass, queries);
+    return result.entrySet().stream()
+        .collect(Collectors.toMap(e -> e.getKey().getPartial(), e -> e.getValue() == 1));
+  }
+
+  public <T extends BaseRecord> Map<Query<T>, Integer> remove(Class<T> clazz,
+      List<Query<T>> queries) throws IOException {
+    Map<Query<T>, Integer> result = new HashMap<>();
+    for (Query<T> query : queries) {
+      result.put(query, remove(clazz, query));
+    }
+    return result;
+  }
 }

hadoop-hdfs-project/hadoop-hdfs-rbf/src/main/java/org/apache/hadoop/hdfs/server/federation/store/driver/impl/StateStoreZooKeeperImpl.java

@@ -25,7 +25,11 @@
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Map;
+import java.util.Set;
 import java.util.concurrent.Callable;
 import java.util.concurrent.Future;
 import java.util.concurrent.LinkedBlockingQueue;
@@ -284,51 +288,86 @@ public <T extends BaseRecord> StateStoreOperationResult putAll(
   }
 
   @Override
-  public <T extends BaseRecord> int remove(
-      Class<T> clazz, Query<T> query) throws IOException {
+  public <T extends BaseRecord> Map<Query<T>, Integer> remove(Class<T> clazz,
+      List<Query<T>> queries) throws IOException {
     verifyDriverReady();
-    if (query == null) {
-      return 0;
+    // Track how many entries are deleted by each query
+    Map<Query<T>, Integer> ret = new HashMap<>();
+    final List<T> trueRemoved = Collections.synchronizedList(new ArrayList<>());
+    if (queries.isEmpty()) {
+      return ret;
     }
 
     // Read the current data
     long start = monotonicNow();
-    List<T> records = null;
+    List<T> records;
     try {
       QueryResult<T> result = get(clazz);
       records = result.getRecords();
     } catch (IOException ex) {
       LOG.error("Cannot get existing records", ex);
       getMetrics().addFailure(monotonicNow() - start);
-      return 0;
+      return ret;
     }
 
     // Check the records to remove
     String znode = getZNodeForClass(clazz);
-    List<T> recordsToRemove = filterMultiple(query, records);
+    Set<T> recordsToRemove = new HashSet<>();
+    Map<Query<T>, List<T>> queryToRecords = new HashMap<>();
+    for (Query<T> query : queries) {
+      List<T> filtered = filterMultiple(query, records);
+      queryToRecords.put(query, filtered);
+      recordsToRemove.addAll(filtered);
+    }
 
     // Remove the records
-    int removed = 0;
-    for (T existingRecord : recordsToRemove) {
+    List<Callable<Void>> callables = new ArrayList<>();
+    recordsToRemove.forEach(existingRecord -> callables.add(() -> {
       LOG.info("Removing \"{}\"", existingRecord);
       try {
         String primaryKey = getPrimaryKey(existingRecord);
         String path = getNodePath(znode, primaryKey);
         if (zkManager.delete(path)) {
-          removed++;
+          trueRemoved.add(existingRecord);
         } else {
           LOG.error("Did not remove \"{}\"", existingRecord);
         }
       } catch (Exception e) {
         LOG.error("Cannot remove \"{}\"", existingRecord, e);
         getMetrics().addFailure(monotonicNow() - start);
       }
+      return null;
+    }));
+    try {
+      if (enableConcurrent) {
+        executorService.invokeAll(callables);
+      } else {
+        for (Callable<Void> callable : callables) {
+          callable.call();
+        }
+      }
+    } catch (Exception e) {
+      LOG.error("Record removal failed : {}", e.getMessage(), e);
     }
     long end = monotonicNow();
-    if (removed > 0) {
+    if (!trueRemoved.isEmpty()) {
       getMetrics().addRemove(end - start);
     }
-    return removed;
+    // Generate return map
+    for (Map.Entry<Query<T>, List<T>> entry : queryToRecords.entrySet()) {
+      for (T record : entry.getValue()) {
+        if (trueRemoved.contains(record)) {
+          ret.compute(entry.getKey(), (k, v) ->  (v == null) ? 1 : v + 1);
+        }
+      }
+    }
+    return ret;
+  }
+
+  @Override
+  public <T extends BaseRecord> int remove(Class<T> clazz, Query<T> query)
+      throws IOException {
+    return remove(clazz, Collections.singletonList(query)).get(query);
   }
 
   @Override

hadoop-hdfs-project/hadoop-hdfs-rbf/src/test/java/org/apache/hadoop/hdfs/server/federation/store/driver/TestStateStoreZK.java

@@ -140,17 +140,28 @@ public void testAsyncPerformance() throws Exception {
       insertList.add(newRecord);
     }
     // Insert Multiple on sync mode
-    long startSync = Time.now();
+    long startSyncPut = Time.now();
     stateStoreDriver.putAll(insertList, true, false);
-    long endSync = Time.now();
+    long endSyncPut = Time.now();
+    // Removing 1000 records synchronously is painfully slow so test with only 5 records
+    // Then remove the rest with removeAll()
+    long startSyncRemove = Time.now();
+    for (MountTable entry : insertList.subList(0, 5)) {
+      stateStoreDriver.remove(entry);
+    }
+    long endSyncRemove = Time.now();
     stateStoreDriver.removeAll(MembershipState.class);
 
     stateStoreDriver.setEnableConcurrent(true);
     // Insert Multiple on async mode
-    long startAsync = Time.now();
+    long startAsyncPut = Time.now();
     stateStoreDriver.putAll(insertList, true, false);
-    long endAsync = Time.now();
-    assertTrue((endSync - startSync) > (endAsync - startAsync));
+    long endAsyncPut = Time.now();
+    long startAsyncRemove = Time.now();
+    stateStoreDriver.removeMultiple(insertList.subList(0, 5));
+    long endAsyncRemove = Time.now();
+    assertTrue((endSyncPut - startSyncPut) > (endAsyncPut - startAsyncPut));
+    assertTrue((endSyncRemove - startSyncRemove) > (endAsyncRemove - startAsyncRemove));
   }
 
   @Test