HBASE-25880 remove files from filesCompacting when clear compaction queue

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/CompactSplit.java

@@ -24,6 +24,7 @@
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.io.StringWriter;
+import java.util.Collection;
 import java.util.Comparator;
 import java.util.Iterator;
 import java.util.Optional;
@@ -794,13 +795,23 @@ void shutdownLongCompactions(){
   }
 
   public void clearLongCompactionsQueue() {
+    removeFromFilesCompacting(longCompactions);
     longCompactions.getQueue().clear();
   }
 
   public void clearShortCompactionsQueue() {
+    removeFromFilesCompacting(shortCompactions);
     shortCompactions.getQueue().clear();
   }
 
+  private void removeFromFilesCompacting(ThreadPoolExecutor compactor) {
+    for (Runnable runnable : compactor.getQueue()) {
+      CompactionRunner runner = (CompactionRunner) runnable;
+      Collection<HStoreFile> files = runner.compaction.getRequest().getFiles();
+      runner.store.removeFromCompactingFiles(files);
+    }
+  }
+
   public boolean isCompactionsEnabled() {
     return compactionsEnabled;
   }

hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HStore.java

@@ -1953,6 +1953,22 @@ private void addToCompactingFiles(Collection<HStoreFile> filesToAdd) {
     Collections.sort(filesCompacting, storeEngine.getStoreFileManager().getStoreFileComparator());
   }
 
+  /**
+   * Remove the files from compacting files. This usually happens when we clear compaction queues.
+   */
+  public void removeFromCompactingFiles(Collection<HStoreFile> filesToRemove) {
+    synchronized (filesCompacting) {
+      filesCompacting.removeAll(filesToRemove);
+      Collections.sort(filesCompacting, storeEngine.getStoreFileManager().getStoreFileComparator());
+    }
+  }
+
+  public List<HStoreFile> getFilesCompacting() {
+    synchronized (filesCompacting) {
+      return Lists.newArrayList(filesCompacting);
+    }
+  }
+
   private void removeUnneededFiles() throws IOException {
     if (!conf.getBoolean("hbase.store.delete.expired.storefile", true)) {
       return;

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestCompaction.java

@@ -553,6 +553,49 @@ public void testMultipleCustomCompactionRequests() throws Exception {
     thread.interruptIfNecessary();
   }
 
+  /**
+   *  HBASE-25880: remove files in CompactionContext from filesCompacting
+   *  when clear compaction queues
+   */
+  @Test
+  public void testRemoveCompactingFilesWhenClearCompactionQueue() throws Exception {
+    // setup a compact/split thread on a mock server
+    HRegionServer mockServer = Mockito.mock(HRegionServer.class);
+    Mockito.when(mockServer.getConfiguration()).thenReturn(r.getBaseConf());
+    CompactSplit thread = new CompactSplit(mockServer);
+    Mockito.when(mockServer.getCompactSplitThread()).thenReturn(thread);
+
+    // create some store files and setup requests for each store on which we want to do a
+    // compaction
+    for (HStore store : r.getStores()) {
+      createStoreFile(r, store.getColumnFamilyName());
+      createStoreFile(r, store.getColumnFamilyName());
+      createStoreFile(r, store.getColumnFamilyName());
+      thread.requestCompaction(r, store, "test remove compacting files", PRIORITY_USER,
+        new LazyTracker(), null);
+    }
+
+    // I am a little confused here. Why longCompactions take one CompactionRunner?
+    assertEquals(2, thread.getLongCompactions().getActiveCount() +
+      thread.getShortCompactions().getActiveCount());
+
+    // compaction queues start from the third store.
+    List<HStoreFile> compactingFiles = r.getStores().get(2).getFilesCompacting();
+    Collection<HStoreFile> storeFiles = r.getStores().get(2).getStorefiles();
+    for (HStoreFile file : storeFiles) {
+      assertTrue(compactingFiles.contains(file));
+    }
+
+    thread.clearShortCompactionsQueue();
+
+    compactingFiles = r.getStores().get(2).getFilesCompacting();
+    for (HStoreFile file : storeFiles) {
+      assertFalse(compactingFiles.contains(file));
+    }
+
+    thread.interruptIfNecessary();
+  }
+
   class StoreMockMaker extends StatefulStoreMockMaker {
     public ArrayList<HStoreFile> compacting = new ArrayList<>();
     public ArrayList<HStoreFile> notCompacting = new ArrayList<>();
@@ -874,6 +917,21 @@ public void afterExecution(Store store) {
     }
   }
 
+  /**
+   * Simple {@link CompactionLifeCycleTracker} that sleep 10s before actually doCompaction to keep
+   * compaction queue nonempty
+   */
+  public static class LazyTracker implements CompactionLifeCycleTracker {
+    @Override
+    public void beforeExecution(Store store) {
+      try {
+        Thread.sleep(10000);
+      } catch (InterruptedException e) {
+        throw new RuntimeException(e);
+      }
+    }
+  }
+
   /**
    * Simple {@link CompactionLifeCycleTracker} on which you can wait until the requested compaction
    * finishes.