HBASE-26065 StripeStoreFileManager does not need to throw IOException…

… for most methods (#3459)

Signed-off-by: Xiaolin Ha <haxiaolin@apache.org>

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

@@ -88,9 +88,9 @@ public Collection<HStoreFile> getCompactedfiles() {
   }
 
   @Override
-  public void insertNewFiles(Collection<HStoreFile> sfs) throws IOException {
+  public void insertNewFiles(Collection<HStoreFile> sfs) {
     this.storefiles =
-        ImmutableList.sortedCopyOf(storeFileComparator, Iterables.concat(this.storefiles, sfs));
+      ImmutableList.sortedCopyOf(storeFileComparator, Iterables.concat(this.storefiles, sfs));
   }
 
   @Override
@@ -132,11 +132,10 @@ public void addCompactionResults(Collection<HStoreFile> newCompactedfiles,
   }
 
   @Override
-  public void removeCompactedFiles(Collection<HStoreFile> removedCompactedfiles)
-      throws IOException {
+  public void removeCompactedFiles(Collection<HStoreFile> removedCompactedfiles) {
     this.compactedfiles =
-        this.compactedfiles.stream().filter(sf -> !removedCompactedfiles.contains(sf))
-            .sorted(storeFileComparator).collect(ImmutableList.toImmutableList());
+      this.compactedfiles.stream().filter(sf -> !removedCompactedfiles.contains(sf))
+        .sorted(storeFileComparator).collect(ImmutableList.toImmutableList());
   }
 
   @Override

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

@@ -32,12 +32,15 @@
 import org.apache.hbase.thirdparty.com.google.common.collect.ImmutableCollection;
 
 /**
- * Manages the store files and basic metadata about that that determines the logical structure
- * (e.g. what files to return for scan, how to determine split point, and such).
- * Does NOT affect the physical structure of files in HDFS.
- * Example alternative structures - the default list of files by seqNum; levelDB one sorted
- * by level and seqNum.
- *
+ * Manages the store files and basic metadata about that that determines the logical structure (e.g.
+ * what files to return for scan, how to determine split point, and such). Does NOT affect the
+ * physical structure of files in HDFS. Example alternative structures - the default list of files
+ * by seqNum; levelDB one sorted by level and seqNum.
+ * <p/>
+ * Notice that, all the states are only in memory, we do not persist anything here. The only place
+ * where we throw an {@link IOException} is the {@link #getSplitPoint()} method, where we need to
+ * read startKey, endKey etc, which may lead to an {@link IOException}.
+ * <p/>
  * Implementations are assumed to be not thread safe.
  */
 @InterfaceAudience.Private
@@ -52,22 +55,20 @@ public interface StoreFileManager {
    * Adds new files, either for from MemStore flush or bulk insert, into the structure.
    * @param sfs New store files.
    */
-  void insertNewFiles(Collection<HStoreFile> sfs) throws IOException;
+  void insertNewFiles(Collection<HStoreFile> sfs);
 
   /**
    * Adds only the new compaction results into the structure.
    * @param compactedFiles The input files for the compaction.
    * @param results The resulting files for the compaction.
    */
-  void addCompactionResults(
-      Collection<HStoreFile> compactedFiles, Collection<HStoreFile> results) throws IOException;
+  void addCompactionResults(Collection<HStoreFile> compactedFiles, Collection<HStoreFile> results);
 
   /**
    * Remove the compacted files
    * @param compactedFiles the list of compacted files
-   * @throws IOException
    */
-  void removeCompactedFiles(Collection<HStoreFile> compactedFiles) throws IOException;
+  void removeCompactedFiles(Collection<HStoreFile> compactedFiles);
 
   /**
    * Clears all the files currently in use and returns them.
@@ -145,7 +146,6 @@ Iterator<HStoreFile> updateCandidateFilesForRowKeyBefore(Iterator<HStoreFile> ca
   /**
    * Gets the split point for the split of this set of store files (approx. middle).
    * @return The mid-point if possible.
-   * @throws IOException
    */
   Optional<byte[]> getSplitPoint() throws IOException;
 

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

@@ -152,10 +152,9 @@ public int getCompactedFilesCount() {
   }
 
   @Override
-  public void insertNewFiles(Collection<HStoreFile> sfs) throws IOException {
+  public void insertNewFiles(Collection<HStoreFile> sfs) {
     CompactionOrFlushMergeCopy cmc = new CompactionOrFlushMergeCopy(true);
-    // Passing null does not cause NPE??
-    cmc.mergeResults(null, sfs);
+    cmc.mergeResults(Collections.emptyList(), sfs);
     debugDumpState("Added new files");
   }
 
@@ -321,11 +320,11 @@ public Collection<HStoreFile> getFilesForScan(byte[] startRow, boolean includeSt
   }
 
   @Override
-  public void addCompactionResults(
-    Collection<HStoreFile> compactedFiles, Collection<HStoreFile> results) throws IOException {
+  public void addCompactionResults(Collection<HStoreFile> compactedFiles,
+    Collection<HStoreFile> results) {
     // See class comment for the assumptions we make here.
-    LOG.debug("Attempting to merge compaction results: " + compactedFiles.size()
-        + " files replaced by " + results.size());
+    LOG.debug("Attempting to merge compaction results: " + compactedFiles.size() +
+      " files replaced by " + results.size());
     // In order to be able to fail in the middle of the operation, we'll operate on lazy
     // copies and apply the result at the end.
     CompactionOrFlushMergeCopy cmc = new CompactionOrFlushMergeCopy(false);
@@ -345,7 +344,7 @@ private void markCompactedAway(Collection<HStoreFile> compactedFiles) {
   }
 
   @Override
-  public void removeCompactedFiles(Collection<HStoreFile> compactedFiles) throws IOException {
+  public void removeCompactedFiles(Collection<HStoreFile> compactedFiles) {
     // See class comment for the assumptions we make here.
     LOG.debug("Attempting to delete compaction results: " + compactedFiles.size());
     // In order to be able to fail in the middle of the operation, we'll operate on lazy
@@ -728,13 +727,15 @@ public CompactionOrFlushMergeCopy(boolean isFlush) {
       this.isFlush = isFlush;
     }
 
-    private void mergeResults(Collection<HStoreFile> compactedFiles, Collection<HStoreFile> results)
-        throws IOException {
+    private void mergeResults(Collection<HStoreFile> compactedFiles,
+      Collection<HStoreFile> results) {
       assert this.compactedFiles == null && this.results == null;
       this.compactedFiles = compactedFiles;
       this.results = results;
       // Do logical processing.
-      if (!isFlush) removeCompactedFiles();
+      if (!isFlush) {
+        removeCompactedFiles();
+      }
       TreeMap<byte[], HStoreFile> newStripes = processResults();
       if (newStripes != null) {
         processNewCandidateStripes(newStripes);
@@ -745,7 +746,7 @@ private void mergeResults(Collection<HStoreFile> compactedFiles, Collection<HSto
       updateMetadataMaps();
     }
 
-    private void deleteResults(Collection<HStoreFile> compactedFiles) throws IOException {
+    private void deleteResults(Collection<HStoreFile> compactedFiles) {
       this.compactedFiles = compactedFiles;
       // Create new state and update parent.
       State state = createNewState(true);
@@ -828,11 +829,11 @@ private final ArrayList<HStoreFile> getLevel0Copy() {
     }
 
     /**
-     * Process new files, and add them either to the structure of existing stripes,
-     * or to the list of new candidate stripes.
+     * Process new files, and add them either to the structure of existing stripes, or to the list
+     * of new candidate stripes.
      * @return New candidate stripes.
      */
-    private TreeMap<byte[], HStoreFile> processResults() throws IOException {
+    private TreeMap<byte[], HStoreFile> processResults() {
       TreeMap<byte[], HStoreFile> newStripes = null;
       for (HStoreFile sf : this.results) {
         byte[] startRow = startOf(sf), endRow = endOf(sf);
@@ -859,8 +860,9 @@ private TreeMap<byte[], HStoreFile> processResults() throws IOException {
         }
         HStoreFile oldSf = newStripes.put(endRow, sf);
         if (oldSf != null) {
-          throw new IOException("Compactor has produced multiple files for the stripe ending in ["
-              + Bytes.toString(endRow) + "], found " + sf.getPath() + " and " + oldSf.getPath());
+          throw new IllegalStateException(
+            "Compactor has produced multiple files for the stripe ending in [" +
+              Bytes.toString(endRow) + "], found " + sf.getPath() + " and " + oldSf.getPath());
         }
       }
       return newStripes;
@@ -869,7 +871,7 @@ private TreeMap<byte[], HStoreFile> processResults() throws IOException {
     /**
      * Remove compacted files.
      */
-    private void removeCompactedFiles() throws IOException {
+    private void removeCompactedFiles() {
       for (HStoreFile oldFile : this.compactedFiles) {
         byte[] oldEndRow = endOf(oldFile);
         List<HStoreFile> source = null;
@@ -878,13 +880,14 @@ private void removeCompactedFiles() throws IOException {
         } else {
           int stripeIndex = findStripeIndexByEndRow(oldEndRow);
           if (stripeIndex < 0) {
-            throw new IOException("An allegedly compacted file [" + oldFile + "] does not belong"
-                + " to a known stripe (end row - [" + Bytes.toString(oldEndRow) + "])");
+            throw new IllegalStateException(
+              "An allegedly compacted file [" + oldFile + "] does not belong" +
+                " to a known stripe (end row - [" + Bytes.toString(oldEndRow) + "])");
           }
           source = getStripeCopy(stripeIndex);
         }
         if (!source.remove(oldFile)) {
-          throw new IOException("An allegedly compacted file [" + oldFile + "] was not found");
+          LOG.warn("An allegedly compacted file [{}] was not found", oldFile);
         }
       }
     }
@@ -894,16 +897,15 @@ private void removeCompactedFiles() throws IOException {
      * new candidate stripes/removes old stripes; produces new set of stripe end rows.
      * @param newStripes  New stripes - files by end row.
      */
-    private void processNewCandidateStripes(
-        TreeMap<byte[], HStoreFile> newStripes) throws IOException {
+    private void processNewCandidateStripes(TreeMap<byte[], HStoreFile> newStripes) {
       // Validate that the removed and added aggregate ranges still make for a full key space.
       boolean hasStripes = !this.stripeFiles.isEmpty();
       this.stripeEndRows = new ArrayList<>(Arrays.asList(StripeStoreFileManager.this.state.stripeEndRows));
       int removeFrom = 0;
       byte[] firstStartRow = startOf(newStripes.firstEntry().getValue());
       byte[] lastEndRow = newStripes.lastKey();
       if (!hasStripes && (!isOpen(firstStartRow) || !isOpen(lastEndRow))) {
-        throw new IOException("Newly created stripes do not cover the entire key space.");
+        throw new IllegalStateException("Newly created stripes do not cover the entire key space.");
       }
 
       boolean canAddNewStripes = true;
@@ -915,11 +917,15 @@ private void processNewCandidateStripes(
           removeFrom = 0;
         } else {
           removeFrom = findStripeIndexByEndRow(firstStartRow);
-          if (removeFrom < 0) throw new IOException("Compaction is trying to add a bad range.");
+          if (removeFrom < 0) {
+            throw new IllegalStateException("Compaction is trying to add a bad range.");
+          }
           ++removeFrom;
         }
         int removeTo = findStripeIndexByEndRow(lastEndRow);
-        if (removeTo < 0) throw new IOException("Compaction is trying to add a bad range.");
+        if (removeTo < 0) {
+          throw new IllegalStateException("Compaction is trying to add a bad range.");
+        }
         // See if there are files in the stripes we are trying to replace.
         ArrayList<HStoreFile> conflictingFiles = new ArrayList<>();
         for (int removeIndex = removeTo; removeIndex >= removeFrom; --removeIndex) {
@@ -961,7 +967,9 @@ private void processNewCandidateStripes(
         }
       }
 
-      if (!canAddNewStripes) return; // Files were already put into L0.
+      if (!canAddNewStripes) {
+        return; // Files were already put into L0.
+      }
 
       // Now, insert new stripes. The total ranges match, so we can insert where we removed.
       byte[] previousEndRow = null;
@@ -972,8 +980,8 @@ private void processNewCandidateStripes(
           assert !isOpen(previousEndRow);
           byte[] startRow = startOf(newStripe.getValue());
           if (!rowEquals(previousEndRow, startRow)) {
-            throw new IOException("The new stripes produced by "
-                + (isFlush ? "flush" : "compaction") + " are not contiguous");
+            throw new IllegalStateException("The new stripes produced by " +
+              (isFlush ? "flush" : "compaction") + " are not contiguous");
           }
         }
         // Add the new stripe.

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

@@ -21,8 +21,9 @@
 import static org.junit.Assert.assertArrayEquals;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertThrows;
 import static org.junit.Assert.assertTrue;
-import static org.junit.Assert.fail;
+
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -542,14 +543,10 @@ private void testPriorityScenario(int expectedPriority,
   }
 
   private void verifyInvalidCompactionScenario(StripeStoreFileManager manager,
-      ArrayList<HStoreFile> filesToCompact, ArrayList<HStoreFile> filesToInsert) throws Exception {
+    ArrayList<HStoreFile> filesToCompact, ArrayList<HStoreFile> filesToInsert) throws Exception {
     Collection<HStoreFile> allFiles = manager.getStorefiles();
-    try {
-      manager.addCompactionResults(filesToCompact, filesToInsert);
-      fail("Should have thrown");
-    } catch (IOException ex) {
-      // Ignore it.
-    }
+    assertThrows(IllegalStateException.class,
+      () -> manager.addCompactionResults(filesToCompact, filesToInsert));
     verifyAllFiles(manager, allFiles); // must have the same files.
   }