HBASE-22976 [HBCK2] Add RecoveredEditsPlayer (#2504)

Make it so WALPlayer can replay recovered.edits files.

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALInputFormat.java
 Allow for WAL files that do NOT have a startime in their name.
 Use the 'generic' WAL-filename parser instead of the one that
 used be local here. Implement support for 'startTime' filter.
 Previous was just not implemented.

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALPlayer.java
 Checkstyle.

hbase-server/src/main/java/org/apache/hadoop/hbase/wal/AbstractFSWALProvider.java
 Use the new general WAL name timestamp parser.

hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WAL.java
 Utility for parsing timestamp from WAL filename.

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRecoveredEdits.java
 Export attributes about the local recovered.edits test file
 so other tests can play with it.

Signed-off-by: Wellington Chevreuil <wchevreuil@apache.org>

hbase-common/src/main/java/org/apache/hadoop/hbase/util/CommonFSUtils.java

@@ -365,7 +365,8 @@ public final class CommonFSUtils {
     if (!qualifiedWalDir.equals(rootDir)) {
       if (qualifiedWalDir.toString().startsWith(rootDir.toString() + "/")) {
         throw new IllegalStateException("Illegal WAL directory specified. " +
-            "WAL directories are not permitted to be under the root directory if set.");
+          "WAL directories are not permitted to be under root directory: rootDir=" +
+          rootDir.toString() + ", qualifiedWALDir=" + qualifiedWalDir);
       }
     }
     return true;

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALInputFormat.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
@@ -22,24 +22,21 @@ import java.io.DataOutput;
 import java.io.EOFException;
 import java.io.FileNotFoundException;
 import java.io.IOException;
+import java.time.Instant;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
-
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.fs.FileStatus;
 import org.apache.hadoop.fs.FileSystem;
 import org.apache.hadoop.fs.LocatedFileStatus;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.fs.RemoteIterator;
-import org.apache.yetus.audience.InterfaceAudience;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-import org.apache.hadoop.hbase.wal.WALEdit;
 import org.apache.hadoop.hbase.wal.AbstractFSWALProvider;
 import org.apache.hadoop.hbase.wal.WAL;
 import org.apache.hadoop.hbase.wal.WAL.Entry;
 import org.apache.hadoop.hbase.wal.WAL.Reader;
+import org.apache.hadoop.hbase.wal.WALEdit;
 import org.apache.hadoop.hbase.wal.WALKey;
 import org.apache.hadoop.io.Writable;
 import org.apache.hadoop.mapreduce.InputFormat;
@@ -49,6 +46,9 @@ import org.apache.hadoop.mapreduce.RecordReader;
 import org.apache.hadoop.mapreduce.TaskAttemptContext;
 import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
 import org.apache.hadoop.util.StringUtils;
+import org.apache.yetus.audience.InterfaceAudience;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 /**
  * Simple {@link InputFormat} for {@link org.apache.hadoop.hbase.wal.WAL} files.
@@ -77,10 +77,6 @@ public class WALInputFormat extends InputFormat<WALKey, WALEdit> {
      * Represent an WALSplit, i.e. a single WAL file.
      * Start- and EndTime are managed by the split, so that WAL files can be
      * filtered before WALEdits are passed to the mapper(s).
-     * @param logFileName
-     * @param fileSize
-     * @param startTime
-     * @param endTime
      */
     public WALSplit(String logFileName, long fileSize, long startTime, long endTime) {
       this.logFileName = logFileName;
@@ -186,7 +182,9 @@ public class WALInputFormat extends InputFormat<WALKey, WALEdit> {
 
     @Override
     public boolean nextKeyValue() throws IOException, InterruptedException {
-      if (reader == null) return false;
+      if (reader == null) {
+        return false;
+      }
       this.currentPos = reader.getPosition();
       Entry temp;
       long i = -1;
@@ -204,7 +202,9 @@ public class WALInputFormat extends InputFormat<WALKey, WALEdit> {
         } while (temp != null && temp.getKey().getWriteTime() < startTime);
 
         if (temp == null) {
-          if (i > 0) LOG.info("Skipped " + i + " entries.");
+          if (i > 0) {
+            LOG.info("Skipped " + i + " entries.");
+          }
           LOG.info("Reached end of file.");
           return false;
         } else if (i > 0) {
@@ -242,7 +242,9 @@ public class WALInputFormat extends InputFormat<WALKey, WALEdit> {
     @Override
     public void close() throws IOException {
       LOG.info("Closing reader");
-      if (reader != null) this.reader.close();
+      if (reader != null) {
+        this.reader.close();
+      }
     }
   }
 
@@ -301,40 +303,56 @@ public class WALInputFormat extends InputFormat<WALKey, WALEdit> {
       inpDirs.split(conf.get(WALPlayer.INPUT_FILES_SEPARATOR_KEY, ",")));
   }
 
+  /**
+   * @param startTime If file looks like it has a timestamp in its name, we'll check if newer
+   *                  or equal to this value else we will filter out the file. If name does not
+   *                  seem to have a timestamp, we will just return it w/o filtering.
+   * @param endTime If file looks like it has a timestamp in its name, we'll check if older or equal
+   *                to this value else we will filter out the file. If name does not seem to
+   *                have a timestamp, we will just return it w/o filtering.
+   */
   private List<FileStatus> getFiles(FileSystem fs, Path dir, long startTime, long endTime)
       throws IOException {
     List<FileStatus> result = new ArrayList<>();
     LOG.debug("Scanning " + dir.toString() + " for WAL files");
-
     RemoteIterator<LocatedFileStatus> iter = fs.listLocatedStatus(dir);
-    if (!iter.hasNext()) return Collections.emptyList();
+    if (!iter.hasNext()) {
+      return Collections.emptyList();
+    }
     while (iter.hasNext()) {
       LocatedFileStatus file = iter.next();
       if (file.isDirectory()) {
-        // recurse into sub directories
+        // Recurse into sub directories
         result.addAll(getFiles(fs, file.getPath(), startTime, endTime));
       } else {
-        String name = file.getPath().toString();
+        addFile(result, file, startTime, endTime);
-        int idx = name.lastIndexOf('.');
-        if (idx > 0) {
-          try {
-            long fileStartTime = Long.parseLong(name.substring(idx+1));
-            if (fileStartTime <= endTime) {
-              LOG.info("Found: " + file);
-              result.add(file);
-            }
-          } catch (NumberFormatException x) {
-            idx = 0;
-          }
-        }
-        if (idx == 0) {
-          LOG.warn("File " + name + " does not appear to be an WAL file. Skipping...");
-        }
       }
     }
+    // TODO: These results should be sorted? Results could be content of recovered.edits directory
+    // -- null padded increasing numeric -- or a WAL file w/ timestamp suffix or timestamp and
+    // then meta suffix. See AbstractFSWALProvider#WALStartTimeComparator
     return result;
   }
 
+  static void addFile(List<FileStatus> result, LocatedFileStatus lfs, long startTime,
+      long endTime) {
+    long timestamp = WAL.getTimestamp(lfs.getPath().getName());
+    if (timestamp > 0) {
+      // Looks like a valid timestamp.
+      if (timestamp <= endTime && timestamp >= startTime) {
+        LOG.info("Found {}", lfs.getPath());
+        result.add(lfs);
+      } else {
+        LOG.info("Skipped {}, outside range [{}/{} - {}/{}]", lfs.getPath(),
+          startTime, Instant.ofEpochMilli(startTime), endTime, Instant.ofEpochMilli(endTime));
+      }
+    } else {
+      // If no timestamp, add it regardless.
+      LOG.info("Found (no-timestamp!) {}", lfs);
+      result.add(lfs);
+    }
+  }
+
   @Override
   public RecordReader<WALKey, WALEdit> createRecordReader(InputSplit split,
       TaskAttemptContext context) throws IOException, InterruptedException {

hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/WALPlayer.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
@@ -22,7 +22,6 @@ import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Map;
 import java.util.TreeMap;
-
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.conf.Configured;
 import org.apache.hadoop.fs.Path;
@@ -279,6 +278,7 @@ public class WALPlayer extends Configured implements Tool {
       super.cleanup(context);
     }
 
+    @SuppressWarnings("checkstyle:EmptyBlock")
     @Override
     public void setup(Context context) throws IOException {
       String[] tableMap = context.getConfiguration().getStrings(TABLE_MAP_KEY);
@@ -409,17 +409,21 @@ public class WALPlayer extends Configured implements Tool {
     System.err.println(" <WAL inputdir>   directory of WALs to replay.");
     System.err.println(" <tables>         comma separated list of tables. If no tables specified,");
     System.err.println("                  all are imported (even hbase:meta if present).");
-    System.err.println(" <tableMappings>  WAL entries can be mapped to a new set of tables by passing");
+    System.err.println(" <tableMappings>  WAL entries can be mapped to a new set of tables by " +
-    System.err.println("                  <tableMappings>, a comma separated list of target tables.");
+      "passing");
-    System.err.println("                  If specified, each table in <tables> must have a mapping.");
+    System.err.println("                  <tableMappings>, a comma separated list of target " +
+      "tables.");
+    System.err.println("                  If specified, each table in <tables> must have a " +
+      "mapping.");
     System.err.println("To generate HFiles to bulk load instead of loading HBase directly, pass:");
     System.err.println(" -D" + BULK_OUTPUT_CONF_KEY + "=/path/for/output");
     System.err.println(" Only one table can be specified, and no mapping allowed!");
     System.err.println("To specify a time range, pass:");
     System.err.println(" -D" + WALInputFormat.START_TIME_KEY + "=[date|ms]");
     System.err.println(" -D" + WALInputFormat.END_TIME_KEY + "=[date|ms]");
-    System.err.println(" The start and the end date of timerange. The dates can be expressed");
+    System.err.println(" The start and the end date of timerange (inclusive). The dates can be");
-    System.err.println(" in milliseconds since epoch or in yyyy-MM-dd'T'HH:mm:ss.SS format.");
+    System.err.println(" expressed in milliseconds-since-epoch or yyyy-MM-dd'T'HH:mm:ss.SS " +
+      "format.");
     System.err.println(" E.g. 1234567890120 or 2009-02-13T23:32:30.12");
     System.err.println("Other options:");
     System.err.println(" -D" + JOB_NAME_CONF_KEY + "=jobName");

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestWALInputFormat.java

@@ -0,0 +1,75 @@
+/*
+ * 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
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hbase.mapreduce;
+
+import static org.junit.Assert.assertEquals;
+import java.util.ArrayList;
+import java.util.List;
+import org.apache.hadoop.fs.FileStatus;
+import org.apache.hadoop.fs.LocatedFileStatus;
+import org.apache.hadoop.fs.Path;
+import org.apache.hadoop.hbase.HBaseClassTestRule;
+import org.apache.hadoop.hbase.testclassification.MapReduceTests;
+import org.apache.hadoop.hbase.testclassification.SmallTests;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.experimental.categories.Category;
+import org.mockito.Mockito;
+
+@Category({ MapReduceTests.class, SmallTests.class})
+public class TestWALInputFormat {
+  @ClassRule
+  public static final HBaseClassTestRule CLASS_RULE =
+    HBaseClassTestRule.forClass(TestWALInputFormat.class);
+
+  /**
+   * Test the primitive start/end time filtering.
+   */
+  @Test
+  public void testAddFile() {
+    List<FileStatus> lfss = new ArrayList<>();
+    LocatedFileStatus lfs = Mockito.mock(LocatedFileStatus.class);
+    long now = System.currentTimeMillis();
+    Mockito.when(lfs.getPath()).thenReturn(new Path("/name." + now));
+    WALInputFormat.addFile(lfss, lfs, now, now);
+    assertEquals(1, lfss.size());
+    WALInputFormat.addFile(lfss, lfs, now - 1, now - 1);
+    assertEquals(1, lfss.size());
+    WALInputFormat.addFile(lfss, lfs, now - 2, now - 1);
+    assertEquals(1, lfss.size());
+    WALInputFormat.addFile(lfss, lfs, now - 2, now);
+    assertEquals(2, lfss.size());
+    WALInputFormat.addFile(lfss, lfs, Long.MIN_VALUE, now);
+    assertEquals(3, lfss.size());
+    WALInputFormat.addFile(lfss, lfs, Long.MIN_VALUE, Long.MAX_VALUE);
+    assertEquals(4, lfss.size());
+    WALInputFormat.addFile(lfss, lfs, now, now + 2);
+    assertEquals(5, lfss.size());
+    WALInputFormat.addFile(lfss, lfs, now + 1, now + 2);
+    assertEquals(5, lfss.size());
+    Mockito.when(lfs.getPath()).thenReturn(new Path("/name"));
+    WALInputFormat.addFile(lfss, lfs, Long.MIN_VALUE, Long.MAX_VALUE);
+    assertEquals(6, lfss.size());
+    Mockito.when(lfs.getPath()).thenReturn(new Path("/name.123"));
+    WALInputFormat.addFile(lfss, lfs, Long.MIN_VALUE, Long.MAX_VALUE);
+    assertEquals(7, lfss.size());
+    Mockito.when(lfs.getPath()).thenReturn(new Path("/name." + now + ".meta"));
+    WALInputFormat.addFile(lfss, lfs, now, now);
+    assertEquals(8, lfss.size());
+  }
+}

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestWALPlayer.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
@@ -24,8 +24,8 @@ import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.Mockito.doAnswer;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
-
 import java.io.ByteArrayOutputStream;
+import java.io.File;
 import java.io.PrintStream;
 import java.util.ArrayList;
 import org.apache.hadoop.conf.Configuration;
@@ -46,6 +46,7 @@ import org.apache.hadoop.hbase.client.Result;
 import org.apache.hadoop.hbase.client.Table;
 import org.apache.hadoop.hbase.io.ImmutableBytesWritable;
 import org.apache.hadoop.hbase.mapreduce.WALPlayer.WALKeyValueMapper;
+import org.apache.hadoop.hbase.regionserver.TestRecoveredEdits;
 import org.apache.hadoop.hbase.testclassification.LargeTests;
 import org.apache.hadoop.hbase.testclassification.MapReduceTests;
 import org.apache.hadoop.hbase.util.Bytes;
@@ -73,7 +74,6 @@ import org.mockito.stubbing.Answer;
 @Category({MapReduceTests.class, LargeTests.class})
 //TODO : Remove this in 3.0
 public class TestWALPlayer {
-
   @ClassRule
   public static final HBaseClassTestRule CLASS_RULE =
       HBaseClassTestRule.forClass(TestWALPlayer.class);
@@ -91,7 +91,7 @@ public class TestWALPlayer {
 
   @BeforeClass
   public static void beforeClass() throws Exception {
-    conf= TEST_UTIL.getConfiguration();
+    conf = TEST_UTIL.getConfiguration();
     rootDir = TEST_UTIL.createRootDir();
     walRootDir = TEST_UTIL.createWALRootDir();
     fs = CommonFSUtils.getRootDirFileSystem(conf);
@@ -106,9 +106,32 @@ public class TestWALPlayer {
     logFs.delete(walRootDir, true);
   }
 
+  /**
+   * Test that WALPlayer can replay recovered.edits files.
+   */
+  @Test
+  public void testPlayingRecoveredEdit() throws Exception {
+    TableName tn = TableName.valueOf(TestRecoveredEdits.RECOVEREDEDITS_TABLENAME);
+    TEST_UTIL.createTable(tn, TestRecoveredEdits.RECOVEREDEDITS_COLUMNFAMILY);
+    // Copy testing recovered.edits file that is over under hbase-server test resources
+    // up into a dir in our little hdfs cluster here.
+    String hbaseServerTestResourcesEdits = System.getProperty("test.build.classes") +
+        "/../../../hbase-server/src/test/resources/" +
+      TestRecoveredEdits.RECOVEREDEDITS_PATH.getName();
+    assertTrue(new File(hbaseServerTestResourcesEdits).exists());
+    FileSystem dfs = TEST_UTIL.getDFSCluster().getFileSystem();
+    // Target dir.
+    Path targetDir = new Path("edits").makeQualified(dfs.getUri(), dfs.getHomeDirectory());
+    assertTrue(dfs.mkdirs(targetDir));
+    dfs.copyFromLocalFile(new Path(hbaseServerTestResourcesEdits), targetDir);
+    assertEquals(0,
+      ToolRunner.run(new WALPlayer(this.conf), new String [] {targetDir.toString()}));
+    // I don't know how many edits are in this file for this table... so just check more than 1.
+    assertTrue(TEST_UTIL.countRows(tn) > 0);
+  }
+
   /**
    * Simple end-to-end test
-   * @throws Exception
    */
   @Test
   public void testWALPlayer() throws Exception {

hbase-mapreduce/src/test/java/org/apache/hadoop/hbase/mapreduce/TestWALRecordReader.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
@@ -20,7 +20,6 @@ package org.apache.hadoop.hbase.mapreduce;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
-
 import java.util.List;
 import java.util.NavigableMap;
 import java.util.TreeMap;
@@ -42,6 +41,8 @@ import org.apache.hadoop.hbase.testclassification.MapReduceTests;
 import org.apache.hadoop.hbase.testclassification.MediumTests;
 import org.apache.hadoop.hbase.util.Bytes;
 import org.apache.hadoop.hbase.util.CommonFSUtils;
+import org.apache.hadoop.hbase.util.Threads;
+import org.apache.hadoop.hbase.wal.AbstractFSWALProvider;
 import org.apache.hadoop.hbase.wal.WAL;
 import org.apache.hadoop.hbase.wal.WALEdit;
 import org.apache.hadoop.hbase.wal.WALFactory;
@@ -122,8 +123,7 @@ public class TestWALRecordReader {
   }
 
   /**
-   * Test partial reads from the log based on passed time range
+   * Test partial reads from the WALs based on passed time range.
-   * @throws Exception
    */
   @Test
   public void testPartialRead() throws Exception {
@@ -139,6 +139,7 @@ public class TestWALRecordReader {
     edit.add(new KeyValue(rowName, family, Bytes.toBytes("2"), ts+1, value));
     log.appendData(info, getWalKeyImpl(ts+1, scopes), edit);
     log.sync();
+    Threads.sleep(10);
     LOG.info("Before 1st WAL roll " + log.toString());
     log.rollWriter();
     LOG.info("Past 1st WAL roll " + log.toString());
@@ -163,26 +164,29 @@ public class TestWALRecordReader {
     jobConf.set("mapreduce.input.fileinputformat.inputdir", logDir.toString());
     jobConf.setLong(WALInputFormat.END_TIME_KEY, ts);
 
-    // only 1st file is considered, and only its 1st entry is used
+    // Only 1st file is considered, and only its 1st entry is in-range.
     List<InputSplit> splits = input.getSplits(MapreduceTestingShim.createJobContext(jobConf));
-
     assertEquals(1, splits.size());
     testSplit(splits.get(0), Bytes.toBytes("1"));
 
-    jobConf.setLong(WALInputFormat.START_TIME_KEY, ts+1);
     jobConf.setLong(WALInputFormat.END_TIME_KEY, ts1+1);
     splits = input.getSplits(MapreduceTestingShim.createJobContext(jobConf));
-    // both files need to be considered
     assertEquals(2, splits.size());
-    // only the 2nd entry from the 1st file is used
+    // Both entries from first file are in-range.
-    testSplit(splits.get(0), Bytes.toBytes("2"));
+    testSplit(splits.get(0), Bytes.toBytes("1"), Bytes.toBytes("2"));
-    // only the 1nd entry from the 2nd file is used
+    // Only the 1st entry from the 2nd file is in-range.
     testSplit(splits.get(1), Bytes.toBytes("3"));
+
+    jobConf.setLong(WALInputFormat.START_TIME_KEY, ts + 1);
+    jobConf.setLong(WALInputFormat.END_TIME_KEY, ts1 + 1);
+    splits = input.getSplits(MapreduceTestingShim.createJobContext(jobConf));
+    assertEquals(1, splits.size());
+    // Only the 1st entry from the 2nd file is in-range.
+    testSplit(splits.get(0), Bytes.toBytes("3"));
   }
 
   /**
    * Test basic functionality
-   * @throws Exception
    */
   @Test
   public void testWALRecordReader() throws Exception {
@@ -233,11 +237,7 @@ public class TestWALRecordReader {
     jobConf.setLong(WALInputFormat.END_TIME_KEY, Long.MAX_VALUE);
     jobConf.setLong(WALInputFormat.START_TIME_KEY, thirdTs);
     splits = input.getSplits(MapreduceTestingShim.createJobContext(jobConf));
-    // both logs need to be considered
+    assertTrue(splits.isEmpty());
-    assertEquals(2, splits.size());
-    // but both readers skip all edits
-    testSplit(splits.get(0));
-    testSplit(splits.get(1));
   }
 
   protected WALKeyImpl getWalKeyImpl(final long time, NavigableMap<byte[], Integer> scopes) {

hbase-server/src/main/java/org/apache/hadoop/hbase/wal/AbstractFSWALProvider.java

@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.hbase.wal;
 
-import static org.apache.commons.lang3.StringUtils.isNumeric;
 import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.util.ArrayList;
@@ -440,17 +439,12 @@ public abstract class AbstractFSWALProvider<T extends AbstractFSWAL<?>> implemen
      * @return start time
      */
     private static long getTS(Path p) {
-      String name = p.getName();
+      return WAL.getTimestamp(p.getName());
-      String [] splits = name.split("\\.");
-      String ts = splits[splits.length - 1];
-      if (!isNumeric(ts)) {
-        // Its a '.meta' or a '.syncrep' suffix.
-        ts = splits[splits.length - 2];
-      }
-      return Long.parseLong(ts);
     }
   }
 
+
+
   public static boolean isArchivedLogFile(Path p) {
     String oldLog = Path.SEPARATOR + HConstants.HREGION_OLDLOGDIR_NAME + Path.SEPARATOR;
     return p.toString().contains(oldLog);

hbase-server/src/main/java/org/apache/hadoop/hbase/wal/WAL.java

@@ -33,6 +33,7 @@ import org.apache.yetus.audience.InterfaceAudience;
 import org.apache.yetus.audience.InterfaceStability;
 
 import org.apache.hbase.thirdparty.com.google.common.annotations.VisibleForTesting;
+import static org.apache.commons.lang3.StringUtils.isNumeric;
 
 /**
  * A Write Ahead Log (WAL) provides service for reading, writing waledits. This interface provides
@@ -312,4 +313,32 @@ public interface WAL extends Closeable, WALFileLengthProvider {
       return this.key + "=" + this.edit;
     }
   }
+
+  /**
+   * Split a WAL filename to get a start time. WALs usually have the time we start writing to them
+   * as part of their name, usually the suffix. Sometimes there will be an extra suffix as when it
+   * is a WAL for the meta table. For example, WALs might look like this
+   * <code>10.20.20.171%3A60020.1277499063250</code> where <code>1277499063250</code> is the
+   * timestamp. Could also be a meta WAL which adds a '.meta' suffix or a
+   * synchronous replication WAL which adds a '.syncrep' suffix. Check for these. File also may have
+   * no timestamp on it. For example the recovered.edits files are WALs but are named in ascending
+   * order. Here is an example: 0000000000000016310. Allow for this.
+   * @param name Name of the WAL file.
+   * @return Timestamp or -1.
+   */
+  public static long getTimestamp(String name) {
+    String [] splits = name.split("\\.");
+    if (splits.length <= 1) {
+      return -1;
+    }
+    String timestamp = splits[splits.length - 1];
+    if (!isNumeric(timestamp)) {
+      // Its a '.meta' or a '.syncrep' suffix.
+      timestamp = splits[splits.length - 2];
+      if (!isNumeric(timestamp)) {
+        return -1;
+      }
+    }
+    return Long.parseLong(timestamp);
+  }
 }

hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRecoveredEdits.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
@@ -19,7 +19,6 @@ package org.apache.hadoop.hbase.regionserver;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
-
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
@@ -32,12 +31,13 @@ import org.apache.hadoop.hbase.CellComparatorImpl;
 import org.apache.hadoop.hbase.HBaseClassTestRule;
 import org.apache.hadoop.hbase.HBaseTestingUtility;
 import org.apache.hadoop.hbase.HConstants;
-import org.apache.hadoop.hbase.HRegionInfo;
 import org.apache.hadoop.hbase.MemoryCompactionPolicy;
 import org.apache.hadoop.hbase.PrivateCellUtil;
 import org.apache.hadoop.hbase.TableName;
+import org.apache.hadoop.hbase.client.ColumnFamilyDescriptor;
 import org.apache.hadoop.hbase.client.ColumnFamilyDescriptorBuilder;
 import org.apache.hadoop.hbase.client.RegionInfo;
+import org.apache.hadoop.hbase.client.RegionInfoBuilder;
 import org.apache.hadoop.hbase.client.Scan;
 import org.apache.hadoop.hbase.client.TableDescriptor;
 import org.apache.hadoop.hbase.client.TableDescriptorBuilder;
@@ -78,6 +78,32 @@ public class TestRecoveredEdits {
 
   @Rule public TestName testName = new TestName();
 
+  /**
+   * Path to a recovered.edits file in hbase-server test resources folder.
+   * This is a little fragile getting this path to a file of 10M of edits.
+   */
+  @SuppressWarnings("checkstyle:VisibilityModifier")
+  public static final Path RECOVEREDEDITS_PATH = new Path(
+    System.getProperty("test.build.classes", "target/test-classes"),
+    "0000000000000016310");
+
+  /**
+   * Name of table referenced by edits in the recovered.edits file.
+   */
+  public static final String RECOVEREDEDITS_TABLENAME = "IntegrationTestBigLinkedList";
+
+  /**
+   * Column family referenced by edits in the recovered.edits file.
+   */
+  public static final byte [] RECOVEREDEDITS_COLUMNFAMILY = Bytes.toBytes("meta");
+  public static final byte[][] RECOVEREDITS_COLUMNFAMILY_ARRAY =
+    new byte[][] {RECOVEREDEDITS_COLUMNFAMILY};
+  public static final ColumnFamilyDescriptor RECOVEREDEDITS_CFD =
+    ColumnFamilyDescriptorBuilder.newBuilder(RECOVEREDEDITS_COLUMNFAMILY).build();
+
+  /**
+   * Name of table mentioned edits from recovered.edits
+   */
   @BeforeClass
   public static void setUpBeforeClass() throws Exception {
     blockCache = BlockCacheFactory.createBlockCache(TEST_UTIL.getConfiguration());
@@ -88,7 +114,6 @@ public class TestRecoveredEdits {
    * Create a region. Close it. Then copy into place a file to replay, one that is bigger than
    * configured flush size so we bring on lots of flushes.  Then reopen and confirm all edits
    * made it in.
-   * @throws IOException
    */
   @Test
   public void testReplayWorksThoughLotsOfFlushing() throws
@@ -104,33 +129,11 @@ public class TestRecoveredEdits {
     // Set it so we flush every 1M or so.  Thats a lot.
     conf.setInt(HConstants.HREGION_MEMSTORE_FLUSH_SIZE, 1024*1024);
     conf.set(CompactingMemStore.COMPACTING_MEMSTORE_TYPE_KEY, String.valueOf(policy).toLowerCase());
-    // The file of recovered edits has a column family of 'meta'. Also has an encoded regionname
+    TableDescriptor tableDescriptor = TableDescriptorBuilder.
-    // of 4823016d8fca70b25503ee07f4c6d79f which needs to match on replay.
+      newBuilder(TableName.valueOf(testName.getMethodName())).
-    final String encodedRegionName = "4823016d8fca70b25503ee07f4c6d79f";
+      setColumnFamily(RECOVEREDEDITS_CFD) .build();
-    final String columnFamily = "meta";
+    RegionInfo hri = RegionInfoBuilder.newBuilder(tableDescriptor.getTableName()).build();
-    byte [][] columnFamilyAsByteArray = new byte [][] {Bytes.toBytes(columnFamily)};
+    final String encodedRegionName = hri.getEncodedName();
-    TableDescriptor tableDescriptor =
-        TableDescriptorBuilder.newBuilder(TableName.valueOf(testName.getMethodName()))
-            .setColumnFamily(
-                ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes(columnFamily)).build())
-            .build();
-    RegionInfo hri = new HRegionInfo(tableDescriptor.getTableName()) {
-      @Override
-      public synchronized String getEncodedName() {
-        return encodedRegionName;
-      }
-
-      // Cache the name because lots of lookups.
-      private byte[] encodedRegionNameAsBytes = null;
-
-      @Override
-      public synchronized byte[] getEncodedNameAsBytes() {
-        if (encodedRegionNameAsBytes == null) {
-          this.encodedRegionNameAsBytes = Bytes.toBytes(getEncodedName());
-        }
-        return this.encodedRegionNameAsBytes;
-      }
-    };
     Path hbaseRootDir = TEST_UTIL.getDataTestDir();
     FileSystem fs = FileSystem.get(TEST_UTIL.getConfiguration());
     Path tableDir = CommonFSUtils.getTableDir(hbaseRootDir, tableDescriptor.getTableName());
@@ -143,24 +146,20 @@ public class TestRecoveredEdits {
     HRegion region = HBaseTestingUtility
         .createRegionAndWAL(hri, hbaseRootDir, conf, tableDescriptor, blockCache);
     assertEquals(encodedRegionName, region.getRegionInfo().getEncodedName());
-    List<String> storeFiles = region.getStoreFileList(columnFamilyAsByteArray);
+    List<String> storeFiles = region.getStoreFileList(RECOVEREDITS_COLUMNFAMILY_ARRAY);
     // There should be no store files.
     assertTrue(storeFiles.isEmpty());
     region.close();
     Path regionDir = FSUtils.getRegionDirFromRootDir(hbaseRootDir, hri);
     Path recoveredEditsDir = WALSplitUtil.getRegionDirRecoveredEditsDir(regionDir);
-    // This is a little fragile getting this path to a file of 10M of edits.
-    Path recoveredEditsFile = new Path(
-      System.getProperty("test.build.classes", "target/test-classes"),
-        "0000000000000016310");
     // Copy this file under the region's recovered.edits dir so it is replayed on reopen.
-    Path destination = new Path(recoveredEditsDir, recoveredEditsFile.getName());
+    Path destination = new Path(recoveredEditsDir, RECOVEREDEDITS_PATH.getName());
-    fs.copyToLocalFile(recoveredEditsFile, destination);
+    fs.copyToLocalFile(RECOVEREDEDITS_PATH, destination);
     assertTrue(fs.exists(destination));
     // Now the file 0000000000000016310 is under recovered.edits, reopen the region to replay.
     region = HRegion.openHRegion(region, null);
     assertEquals(encodedRegionName, region.getRegionInfo().getEncodedName());
-    storeFiles = region.getStoreFileList(columnFamilyAsByteArray);
+    storeFiles = region.getStoreFileList(RECOVEREDITS_COLUMNFAMILY_ARRAY);
     // Our 0000000000000016310 is 10MB. Most of the edits are for one region. Lets assume that if
     // we flush at 1MB, that there are at least 3 flushed files that are there because of the
     // replay of edits.
@@ -170,19 +169,16 @@ public class TestRecoveredEdits {
       assertTrue("Files count=" + storeFiles.size(), storeFiles.size() > 10);
     }
     // Now verify all edits made it into the region.
-    int count = verifyAllEditsMadeItIn(fs, conf, recoveredEditsFile, region);
+    int count = verifyAllEditsMadeItIn(fs, conf, RECOVEREDEDITS_PATH, region);
+    assertTrue(count > 0);
     LOG.info("Checked " + count + " edits made it in");
   }
 
   /**
-   * @param fs
-   * @param conf
-   * @param edits
-   * @param region
    * @return Return how many edits seen.
-   * @throws IOException
    */
-  private int verifyAllEditsMadeItIn(final FileSystem fs, final Configuration conf,
+  // Used by TestWALPlayer over in hbase-mapreduce too.
+  public static int verifyAllEditsMadeItIn(final FileSystem fs, final Configuration conf,
       final Path edits, final HRegion region) throws IOException {
     int count = 0;
     // Read all cells from recover edits

src/main/asciidoc/_chapters/ops_mgt.adoc

@@ -424,32 +424,11 @@ See <<hfile_tool>>.
 For bulk replaying WAL files or _recovered.edits_ files, see
 <<walplayer>>. For reading/verifying individual files, read on.
 
-[[hlog_tool]]
-==== FSHLog tool
-
-The main method on `FSHLog` offers manual split and dump facilities.
-Pass it WALs or the product of a split, the content of the _recovered.edits_.
-directory.
-
-You can get a textual dump of a WAL file content by doing the following:
-
-----
- $ ./bin/hbase org.apache.hadoop.hbase.regionserver.wal.FSHLog --dump hdfs://example.org:8020/hbase/WALs/example.org,60020,1283516293161/10.10.21.10%3A60020.1283973724012
-----
-
-The return code will be non-zero if there are any issues with the file so you can test wholesomeness of file by redirecting `STDOUT` to `/dev/null` and testing the program return.
-
-Similarly you can force a split of a log file directory by doing:
-
-----
- $ ./bin/hbase org.apache.hadoop.hbase.regionserver.wal.FSHLog --split hdfs://example.org:8020/hbase/WALs/example.org,60020,1283516293161/
-----
-
 [[hlog_tool.prettyprint]]
-===== WALPrettyPrinter
+==== WALPrettyPrinter
 
-The `WALPrettyPrinter` is a tool with configurable options to print the contents of a WAL.
+The `WALPrettyPrinter` is a tool with configurable options to print the contents of a WAL
-You can invoke it via the HBase cli with the 'wal' command.
+or a _recovered.edits_ file. You can invoke it via the HBase cli with the 'wal' command.
 
 ----
  $ ./bin/hbase wal hdfs://example.org:8020/hbase/WALs/example.org,60020,1283516293161/10.10.21.10%3A60020.1283973724012
@@ -904,7 +883,10 @@ The output can optionally be mapped to another set of tables.
 
 WALPlayer can also generate HFiles for later bulk importing, in that case only a single table and no mapping can be specified.
 
-.WALPrettyPrinter/FSHLog Tool
+Finally, you can use WALPlayer to replay the content of a Regions `recovered.edits` directory (the files under
+`recovered.edits` directory have the same format as WAL files).
+
+.WALPrettyPrinter
 [NOTE]
 ====
 To read or verify single WAL files or _recovered.edits_ files, since they share the WAL format,
@@ -945,8 +927,8 @@ To generate HFiles to bulk load instead of loading HBase directly, pass:
 To specify a time range, pass:
  -Dwal.start.time=[date|ms]
  -Dwal.end.time=[date|ms]
- The start and the end date of timerange. The dates can be expressed
+ The start and the end date of timerange (inclusive). The dates can be
- in milliseconds since epoch or in yyyy-MM-dd'T'HH:mm:ss.SS format.
+ expressed in milliseconds-since-epoch or yyyy-MM-dd'T'HH:mm:ss.SS format.
  E.g. 1234567890120 or 2009-02-13T23:32:30.12
 Other options:
  -Dmapreduce.job.name=jobName