HBASE-20940 HStore.cansplit should not allow split to happen if it has references (Vishal Khandelwal)

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

@@ -1701,7 +1701,17 @@ public class HStore implements Store, HeapSize, StoreConfigInformation, Propagat
 
   @Override
   public boolean hasReferences() {
-    return StoreUtils.hasReferences(this.storeEngine.getStoreFileManager().getStorefiles());
+    List<HStoreFile> reloadedStoreFiles = null;
+    try {
+      // Reloading the store files from file system due to HBASE-20940. As split can happen with an
+      // region which has references
+      reloadedStoreFiles = loadStoreFiles();
+      return StoreUtils.hasReferences(reloadedStoreFiles);
+    } catch (IOException ioe) {
+      LOG.error("Error trying to determine if store has references, assuming references exists",
+        ioe);
+      return true;
+    }
   }
 
   /**

hbase-server/src/test/java/org/apache/hadoop/hbase/client/TestAsyncTableGetMultiThreaded.java

@@ -21,7 +21,6 @@ import static org.apache.hadoop.hbase.HConstants.HBASE_CLIENT_META_OPERATION_TIM
 import static org.apache.hadoop.hbase.master.LoadBalancer.TABLES_ON_MASTER;
 import static org.junit.Assert.assertEquals;
 
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
@@ -35,18 +34,21 @@ import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.stream.Collectors;
 import java.util.stream.IntStream;
+
 import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.MemoryCompactionPolicy;
 import org.apache.hadoop.hbase.ServerName;
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.Waiter.ExplainingPredicate;
 import org.apache.hadoop.hbase.io.ByteBufferPool;
 import org.apache.hadoop.hbase.regionserver.CompactingMemStore;
 import org.apache.hadoop.hbase.regionserver.HRegion;
 import org.apache.hadoop.hbase.testclassification.ClientTests;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.hbase.util.RetryCounter;
 import org.apache.hadoop.hbase.util.Threads;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
@@ -124,7 +126,7 @@ public class TestAsyncTableGetMultiThreaded {
   }
 
   @Test
-  public void test() throws IOException, InterruptedException, ExecutionException {
+  public void test() throws Exception {
     int numThreads = 20;
     AtomicBoolean stop = new AtomicBoolean(false);
     ExecutorService executor =
@@ -137,9 +139,31 @@ public class TestAsyncTableGetMultiThreaded {
     Collections.shuffle(Arrays.asList(SPLIT_KEYS), new Random(123));
     Admin admin = TEST_UTIL.getAdmin();
     for (byte[] splitPoint : SPLIT_KEYS) {
+      int oldRegionCount = admin.getRegions(TABLE_NAME).size();
       admin.split(TABLE_NAME, splitPoint);
+      TEST_UTIL.waitFor(30000, new ExplainingPredicate<Exception>() {
+        @Override
+        public boolean evaluate() throws Exception {
+          return TEST_UTIL.getMiniHBaseCluster().getRegions(TABLE_NAME).size() > oldRegionCount;
+        }
+
+        @Override
+        public String explainFailure() throws Exception {
+          return "Split has not finished yet";
+        }
+      });
+
       for (HRegion region : TEST_UTIL.getHBaseCluster().getRegions(TABLE_NAME)) {
         region.compact(true);
+
+        //Waiting for compaction to complete and references are cleaned up
+        RetryCounter retrier = new RetryCounter(30, 1, TimeUnit.SECONDS);
+        while (CompactionState.NONE != admin
+            .getCompactionStateForRegion(region.getRegionInfo().getRegionName())
+            && retrier.shouldRetry()) {
+          retrier.sleepUntilNextRetry();
+        }
+        region.getStores().get(0).closeAndArchiveCompactedFiles();
       }
       Thread.sleep(5000);
       admin.balance(true);

hbase-server/src/test/java/org/apache/hadoop/hbase/io/encoding/TestChangingEncoding.java

@@ -107,6 +107,10 @@ public class TestChangingEncoding {
   public static void setUpBeforeClass() throws Exception {
     // Use a small flush size to create more HFiles.
     conf.setInt(HConstants.HREGION_MEMSTORE_FLUSH_SIZE, 1024 * 1024);
+    // Disabling split to make sure split does not cause modify column to wait which timesout test
+    // sometime
+    conf.set(HConstants.HBASE_REGION_SPLIT_POLICY_KEY,
+        "org.apache.hadoop.hbase.regionserver.DisabledRegionSplitPolicy");
     // ((Log4JLogger)RpcServerImplementation.LOG).getLogger().setLevel(Level.TRACE);
     // ((Log4JLogger)RpcClient.LOG).getLogger().setLevel(Level.TRACE);
     TEST_UTIL.startMiniCluster();

hbase-server/src/test/java/org/apache/hadoop/hbase/namespace/TestNamespaceAuditor.java

@@ -48,7 +48,9 @@ import org.apache.hadoop.hbase.MiniHBaseCluster;
 import org.apache.hadoop.hbase.NamespaceDescriptor;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.Waiter;
+import org.apache.hadoop.hbase.Waiter.ExplainingPredicate;
 import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.client.CompactionState;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.client.DoNotRetryRegionException;
@@ -81,6 +83,7 @@ import org.apache.hadoop.hbase.snapshot.RestoreSnapshotException;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.FSUtils;
+import org.apache.hadoop.hbase.util.RetryCounter;
 import org.apache.hadoop.hbase.util.Threads;
 import org.apache.zookeeper.KeeperException;
 import org.junit.After;
@@ -365,6 +368,23 @@ public class TestNamespaceAuditor {
     HRegion regionToSplit = UTIL.getMiniHBaseCluster().getRegions(tableTwo).stream()
       .filter(r -> r.getRegionInfo().containsRow(splitKey)).findFirst().get();
     regionToSplit.compact(true);
+    // Waiting for compaction to finish
+    UTIL.waitFor(30000, new Waiter.Predicate<Exception>() {
+      @Override
+      public boolean evaluate() throws Exception {
+        return (CompactionState.NONE == ADMIN
+            .getCompactionStateForRegion(regionToSplit.getRegionInfo().getRegionName()));
+      }
+    });
+
+    // Cleaning compacted references for split to proceed
+    regionToSplit.getStores().stream().forEach(s -> {
+      try {
+        s.closeAndArchiveCompactedFiles();
+      } catch (IOException e1) {
+        LOG.error("Error whiling cleaning compacted file");
+      }
+    });
     // the above compact may quit immediately if there is a compaction ongoing, so here we need to
     // wait a while to let the ongoing compaction finish.
     UTIL.waitFor(10000, regionToSplit::isSplittable);

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

@@ -24,10 +24,13 @@ import static org.junit.Assert.assertTrue;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.Map;
 import java.util.Random;
 import java.util.Set;
 import java.util.TreeSet;
+import java.util.concurrent.TimeUnit;
 import java.util.stream.Collectors;
+
 import org.apache.commons.io.IOUtils;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hbase.ChoreService;
@@ -41,6 +44,8 @@ import org.apache.hadoop.hbase.ScheduledChore;
 import org.apache.hadoop.hbase.Stoppable;
 import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
+import org.apache.hadoop.hbase.client.CompactionState;
 import org.apache.hadoop.hbase.client.Connection;
 import org.apache.hadoop.hbase.client.ConnectionFactory;
 import org.apache.hadoop.hbase.client.Get;
@@ -49,13 +54,19 @@ import org.apache.hadoop.hbase.client.RegionInfo;
 import org.apache.hadoop.hbase.client.RegionLocator;
 import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.Table;
+import org.apache.hadoop.hbase.client.TableDescriptor;
+import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.Pair;
 import org.apache.hadoop.hbase.util.PairOfSameType;
+import org.apache.hadoop.hbase.util.RetryCounter;
 import org.apache.hadoop.hbase.util.StoppableImplementation;
 import org.apache.hadoop.hbase.util.Threads;
+import org.apache.hbase.thirdparty.com.google.common.collect.Iterators;
+import org.apache.hbase.thirdparty.com.google.common.collect.Maps;
 import org.junit.AfterClass;
+import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
 import org.junit.Rule;
@@ -65,8 +76,6 @@ import org.junit.rules.TestName;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import org.apache.hbase.thirdparty.com.google.common.collect.Iterators;
-
 @Category(LargeTests.class)
 public class TestEndToEndSplitTransaction {
 
@@ -92,6 +101,78 @@ public class TestEndToEndSplitTransaction {
     TEST_UTIL.shutdownMiniCluster();
   }
 
+
+  /*
+   * This is the test for : HBASE-20940 This test will split the region and try to open an reference
+   * over store file. Once store file has any reference, it makes sure that region can't be split
+   * @throws Exception
+   */
+  @Test
+  public void testCanSplitJustAfterASplit() throws Exception {
+    LOG.info("Starting testCanSplitJustAfterASplit");
+    byte[] fam = Bytes.toBytes("cf_split");
+
+    TableName tableName = TableName.valueOf("CanSplitTable");
+    Table source = TEST_UTIL.getConnection().getTable(tableName);
+    Admin admin = TEST_UTIL.getAdmin();
+    Map<String, StoreFileReader> scanner = Maps.newHashMap();
+
+    try {
+      TableDescriptor htd = TableDescriptorBuilder.newBuilder(tableName)
+          .setColumnFamily(ColumnFamilyDescriptorBuilder.of(fam)).build();
+
+      admin.createTable(htd);
+      TEST_UTIL.loadTable(source, fam);
+      List<HRegion> regions = TEST_UTIL.getHBaseCluster().getRegions(tableName);
+      regions.get(0).forceSplit(null);
+      admin.split(tableName);
+
+      while (regions.size() <= 1) {
+        regions = TEST_UTIL.getHBaseCluster().getRegions(tableName);
+        regions.stream()
+            .forEach(r -> r.getStores().get(0).getStorefiles().stream()
+                .filter(
+                  s -> s.isReference() && !scanner.containsKey(r.getRegionInfo().getEncodedName()))
+                .forEach(sf -> {
+                  StoreFileReader reader = ((HStoreFile) sf).getReader();
+                  reader.getStoreFileScanner(true, false, false, 0, 0, false);
+                  scanner.put(r.getRegionInfo().getEncodedName(), reader);
+                  LOG.info("Got reference to file = " + sf.getPath() + ",for region = "
+                      + r.getRegionInfo().getEncodedName());
+                }));
+      }
+
+      Assert.assertTrue("Regions did not split properly", regions.size() > 1);
+      Assert.assertTrue("Could not get reference any of the store file", scanner.size() > 1);
+
+      RetryCounter retrier = new RetryCounter(30, 1, TimeUnit.SECONDS);
+      while (CompactionState.NONE != admin.getCompactionState(tableName) && retrier.shouldRetry()) {
+        retrier.sleepUntilNextRetry();
+      }
+
+      Assert.assertEquals("Compaction did not complete in 30 secs", CompactionState.NONE,
+        admin.getCompactionState(tableName));
+
+      regions.stream()
+          .filter(region -> scanner.containsKey(region.getRegionInfo().getEncodedName()))
+          .forEach(r -> Assert.assertTrue("Contains an open file reference which can be split",
+            !r.getStores().get(0).canSplit()));
+    } finally {
+      scanner.values().stream().forEach(s -> {
+        try {
+          s.close(true);
+        } catch (IOException ioe) {
+          LOG.error("Failed while closing store file", ioe);
+        }
+      });
+      scanner.clear();
+      if (source != null) {
+        source.close();
+      }
+      TEST_UTIL.deleteTableIfAny(tableName);
+    }
+  }
+
   /**
    * Tests that the client sees meta table changes as atomic during splits
    */
@@ -151,18 +232,17 @@ public class TestEndToEndSplitTransaction {
     public void run() {
       try {
         Random random = new Random();
-        for (int i= 0; i< 5; i++) {
+        for (int i = 0; i < 5; i++) {
-          List<RegionInfo> regions =
+          List<RegionInfo> regions = MetaTableAccessor.getTableRegions(connection, tableName, true);
-              MetaTableAccessor.getTableRegions(connection, tableName, true);
           if (regions.isEmpty()) {
             continue;
           }
           int regionIndex = random.nextInt(regions.size());
 
-          //pick a random region and split it into two
+          // pick a random region and split it into two
           RegionInfo region = Iterators.get(regions.iterator(), regionIndex);
 
-          //pick the mid split point
+          // pick the mid split point
           int start = 0, end = Integer.MAX_VALUE;
           if (region.getStartKey().length > 0) {
             start = Bytes.toInt(region.getStartKey());
@@ -173,7 +253,7 @@ public class TestEndToEndSplitTransaction {
           int mid = start + ((end - start) / 2);
           byte[] splitPoint = Bytes.toBytes(mid);
 
-          //put some rows to the regions
+          // put some rows to the regions
           addData(start);
           addData(mid);
 
@@ -183,11 +263,11 @@ public class TestEndToEndSplitTransaction {
           log("Initiating region split for:" + region.getRegionNameAsString());
           try {
             admin.splitRegion(region.getRegionName(), splitPoint);
-            //wait until the split is complete
+            // wait until the split is complete
             blockUntilRegionSplit(CONF, 50000, region.getRegionName(), true);
 
           } catch (NotServingRegionException ex) {
-            //ignore
+            // ignore
           }
         }
       } catch (Throwable ex) {
@@ -226,9 +306,11 @@ public class TestEndToEndSplitTransaction {
     /** verify region boundaries obtained from MetaScanner */
     void verifyRegionsUsingMetaTableAccessor() throws Exception {
       List<RegionInfo> regionList = MetaTableAccessor.getTableRegions(connection, tableName, true);
-      verifyTableRegions(regionList.stream().collect(Collectors.toCollection(() -> new TreeSet<>(RegionInfo.COMPARATOR))));
+      verifyTableRegions(regionList.stream()
+          .collect(Collectors.toCollection(() -> new TreeSet<>(RegionInfo.COMPARATOR))));
       regionList = MetaTableAccessor.getAllRegions(connection, true);
-      verifyTableRegions(regionList.stream().collect(Collectors.toCollection(() -> new TreeSet<>(RegionInfo.COMPARATOR))));
+      verifyTableRegions(regionList.stream()
+          .collect(Collectors.toCollection(() -> new TreeSet<>(RegionInfo.COMPARATOR))));
     }
 
     /** verify region boundaries obtained from HTable.getStartEndKeys() */
@@ -343,7 +425,9 @@ public class TestEndToEndSplitTransaction {
     }
   }
 
-  /** Blocks until the region split is complete in hbase:meta and region server opens the daughters */
+  /**
+   * Blocks until the region split is complete in hbase:meta and region server opens the daughters
+   */
   public static void blockUntilRegionSplit(Configuration conf, long timeout,
       final byte[] regionName, boolean waitForDaughters)
       throws IOException, InterruptedException {
@@ -389,10 +473,32 @@ public class TestEndToEndSplitTransaction {
 
         rem = timeout - (System.currentTimeMillis() - start);
         blockUntilRegionIsOpened(conf, rem, daughterB);
+
+        // Compacting the new region to make sure references can be cleaned up
+        compactAndBlockUntilDone(TEST_UTIL.getAdmin(),
+          TEST_UTIL.getMiniHBaseCluster().getRegionServer(0), daughterA.getRegionName());
+        compactAndBlockUntilDone(TEST_UTIL.getAdmin(),
+          TEST_UTIL.getMiniHBaseCluster().getRegionServer(0), daughterB.getRegionName());
+
+        removeCompactedFiles(conn, timeout, daughterA);
+        removeCompactedFiles(conn, timeout, daughterB);
       }
     }
   }
 
+  public static void removeCompactedFiles(Connection conn, long timeout, RegionInfo hri)
+      throws IOException, InterruptedException {
+    log("remove compacted files for : " + hri.getRegionNameAsString());
+    List<HRegion> regions = TEST_UTIL.getHBaseCluster().getRegions(hri.getTable());
+    regions.stream().forEach(r -> {
+      try {
+        r.getStores().get(0).closeAndArchiveCompactedFiles();
+      } catch (IOException ioe) {
+        LOG.error("failed in removing compacted file", ioe);
+      }
+    });
+  }
+
   public static void blockUntilRegionIsInMeta(Connection conn, long timeout, RegionInfo hri)
       throws IOException, InterruptedException {
     log("blocking until region is in META: " + hri.getRegionNameAsString());
@@ -415,7 +521,9 @@ public class TestEndToEndSplitTransaction {
         Table table = conn.getTable(hri.getTable())) {
       byte[] row = hri.getStartKey();
       // Check for null/empty row. If we find one, use a key that is likely to be in first region.
-      if (row == null || row.length <= 0) row = new byte[] { '0' };
+      if (row == null || row.length <= 0) {
+        row = new byte[] { '0' };
+      }
       Get get = new Get(row);
       while (System.currentTimeMillis() - start < timeout) {
         try {

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

@@ -31,7 +31,9 @@ import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicBoolean;
+
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.Path;
@@ -50,6 +52,7 @@ import org.apache.hadoop.hbase.TableName;
 import org.apache.hadoop.hbase.UnknownRegionException;
 import org.apache.hadoop.hbase.ZooKeeperConnectionException;
 import org.apache.hadoop.hbase.client.Admin;
+import org.apache.hadoop.hbase.client.CompactionState;
 import org.apache.hadoop.hbase.client.Consistency;
 import org.apache.hadoop.hbase.client.Delete;
 import org.apache.hadoop.hbase.client.DoNotRetryRegionException;
@@ -78,6 +81,10 @@ import org.apache.hadoop.hbase.master.assignment.RegionStates;
 import org.apache.hadoop.hbase.procedure2.ProcedureTestingUtility;
 import org.apache.hadoop.hbase.regionserver.compactions.CompactionContext;
 import org.apache.hadoop.hbase.regionserver.throttle.NoLimitThroughputController;
+import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.ReportRegionStateTransitionRequest;
+import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.ReportRegionStateTransitionResponse;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.testclassification.RegionServerTests;
 import org.apache.hadoop.hbase.util.Bytes;
@@ -85,7 +92,10 @@ import org.apache.hadoop.hbase.util.EnvironmentEdgeManager;
 import org.apache.hadoop.hbase.util.FSUtils;
 import org.apache.hadoop.hbase.util.HBaseFsck;
 import org.apache.hadoop.hbase.util.JVMClusterUtil.RegionServerThread;
+import org.apache.hadoop.hbase.util.RetryCounter;
 import org.apache.hadoop.hbase.util.Threads;
+import org.apache.hbase.thirdparty.com.google.protobuf.RpcController;
+import org.apache.hbase.thirdparty.com.google.protobuf.ServiceException;
 import org.apache.zookeeper.KeeperException;
 import org.apache.zookeeper.KeeperException.NodeExistsException;
 import org.junit.After;
@@ -101,14 +111,6 @@ import org.junit.rules.TestName;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import org.apache.hbase.thirdparty.com.google.protobuf.RpcController;
-import org.apache.hbase.thirdparty.com.google.protobuf.ServiceException;
-
-import org.apache.hadoop.hbase.shaded.protobuf.ProtobufUtil;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.RegionStateTransition.TransitionCode;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.ReportRegionStateTransitionRequest;
-import org.apache.hadoop.hbase.shaded.protobuf.generated.RegionServerStatusProtos.ReportRegionStateTransitionResponse;
-
 /**
  * The below tests are testing split region against a running cluster
  */
@@ -386,11 +388,18 @@ public class TestSplitTransactionOnCluster {
       // Compact first to ensure we have cleaned up references -- else the split
       // will fail.
       this.admin.compactRegion(daughter.getRegionName());
+      RetryCounter retrier = new RetryCounter(30, 1, TimeUnit.SECONDS);
+      while (CompactionState.NONE != admin.getCompactionStateForRegion(daughter.getRegionName())
+          && retrier.shouldRetry()) {
+        retrier.sleepUntilNextRetry();
+      }
       daughters = cluster.getRegions(tableName);
       HRegion daughterRegion = null;
-      for (HRegion r: daughters) {
+      for (HRegion r : daughters) {
         if (RegionInfo.COMPARATOR.compare(r.getRegionInfo(), daughter) == 0) {
           daughterRegion = r;
+          // Archiving the compacted references file
+          r.getStores().get(0).closeAndArchiveCompactedFiles();
           LOG.info("Found matching HRI: " + daughterRegion);
           break;
         }
@@ -533,11 +542,19 @@ public class TestSplitTransactionOnCluster {
       // Call split.
       this.admin.splitRegion(hri.getRegionName());
       List<HRegion> daughters = checkAndGetDaughters(tableName);
+
       // Before cleanup, get a new master.
       HMaster master = abortAndWaitForMaster();
       // Now call compact on the daughters and clean up any references.
-      for (HRegion daughter: daughters) {
+      for (HRegion daughter : daughters) {
         daughter.compact(true);
+        RetryCounter retrier = new RetryCounter(30, 1, TimeUnit.SECONDS);
+        while (CompactionState.NONE != admin
+            .getCompactionStateForRegion(daughter.getRegionInfo().getRegionName())
+            && retrier.shouldRetry()) {
+          retrier.sleepUntilNextRetry();
+        }
+        daughter.getStores().get(0).closeAndArchiveCompactedFiles();
         assertFalse(daughter.hasReferences());
       }
       // BUT calling compact on the daughters is not enough. The CatalogJanitor looks