HDFS-2225. Refactor file management so it's not in classes which should be generic. Contributed by Ivan Kelly.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1154029 13f79535-47bb-0310-9956-ffa450edef68

hdfs/CHANGES.txt

@@ -632,6 +632,9 @@ Trunk (unreleased changes)
     HDFS-2187. Make EditLogInputStream act like an iterator over FSEditLogOps
     (Ivan Kelly and todd via todd)
 
+    HDFS-2225. Refactor file management so it's not in classes which should
+    be generic. (Ivan Kelly via todd)
+
   OPTIMIZATIONS
 
     HDFS-1458. Improve checkpoint performance by avoiding unnecessary image

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/BackupJournalManager.java

@@ -54,7 +54,7 @@ class BackupJournalManager implements JournalManager {
   }
 
   @Override
-  public void purgeLogsOlderThan(long minTxIdToKeep, StoragePurger purger)
+  public void purgeLogsOlderThan(long minTxIdToKeep)
       throws IOException {
   }
 

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FSEditLog.java

@@ -862,8 +862,7 @@ public class FSEditLog  {
   /**
    * Archive any log files that are older than the given txid.
    */
-  public void purgeLogsOlderThan(
-      final long minTxIdToKeep, final StoragePurger purger) {
+  public void purgeLogsOlderThan(final long minTxIdToKeep) {
     synchronized (this) {
       // synchronized to prevent findbugs warning about inconsistent
       // synchronization. This will be JIT-ed out if asserts are
@@ -877,7 +876,7 @@ public class FSEditLog  {
     mapJournalsAndReportErrors(new JournalClosure() {
       @Override
       public void apply(JournalAndStream jas) throws IOException {
-        jas.manager.purgeLogsOlderThan(minTxIdToKeep, purger);
+        jas.manager.purgeLogsOlderThan(minTxIdToKeep);
       }
     }, "purging logs older than " + minTxIdToKeep);
   }

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FSImageStorageInspector.java

@@ -96,4 +96,36 @@ abstract class FSImageStorageInspector {
       return sb.toString();
     }
   }
+
+  /**
+   * Record of an image that has been located and had its filename parsed.
+   */
+  static class FSImageFile {
+    final StorageDirectory sd;    
+    final long txId;
+    private final File file;
+    
+    FSImageFile(StorageDirectory sd, File file, long txId) {
+      assert txId >= 0 : "Invalid txid on " + file +": " + txId;
+      
+      this.sd = sd;
+      this.txId = txId;
+      this.file = file;
+    } 
+    
+    File getFile() {
+      return file;
+    }
+
+    public long getCheckpointTxId() {
+      return txId;
+    }
+    
+    @Override
+    public String toString() {
+      return String.format("FSImageFile(file=%s, cpktTxId=%019d)", 
+                           file.toString(), txId);
+    }
+  }
+
 }

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FSImageTransactionalStorageInspector.java

@@ -37,9 +37,9 @@ import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.hdfs.protocol.FSConstants;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
-import org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.EditLogValidation;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeFile;
+import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
 import org.apache.hadoop.hdfs.server.protocol.RemoteEditLog;
 import org.apache.hadoop.hdfs.server.protocol.RemoteEditLogManifest;
 
@@ -54,17 +54,13 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
   private boolean needToSave = false;
   private boolean isUpgradeFinalized = true;
   
-  List<FoundFSImage> foundImages = new ArrayList<FoundFSImage>();
-  List<FoundEditLog> foundEditLogs = new ArrayList<FoundEditLog>();
+  List<FSImageFile> foundImages = new ArrayList<FSImageFile>();
+  List<EditLogFile> foundEditLogs = new ArrayList<EditLogFile>();
   SortedMap<Long, LogGroup> logGroups = new TreeMap<Long, LogGroup>();
   long maxSeenTxId = 0;
   
   private static final Pattern IMAGE_REGEX = Pattern.compile(
     NameNodeFile.IMAGE.getName() + "_(\\d+)");
-  private static final Pattern EDITS_REGEX = Pattern.compile(
-    NameNodeFile.EDITS.getName() + "_(\\d+)-(\\d+)");
-  private static final Pattern EDITS_INPROGRESS_REGEX = Pattern.compile(
-    NameNodeFile.EDITS_INPROGRESS.getName() + "_(\\d+)");
 
   @Override
   public void inspectDirectory(StorageDirectory sd) throws IOException {
@@ -95,7 +91,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
         if (sd.getStorageDirType().isOfType(NameNodeDirType.IMAGE)) {
           try {
             long txid = Long.valueOf(imageMatch.group(1));
-            foundImages.add(new FoundFSImage(sd, f, txid));
+            foundImages.add(new FSImageFile(sd, f, txid));
           } catch (NumberFormatException nfe) {
             LOG.error("Image file " + f + " has improperly formatted " +
                       "transaction ID");
@@ -117,9 +113,10 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
       LOG.warn("Unable to determine the max transaction ID seen by " + sd, ioe);
     }
     
-    List<FoundEditLog> editLogs = matchEditLogs(filesInStorage);
+    List<EditLogFile> editLogs 
+      = FileJournalManager.matchEditLogs(filesInStorage);
     if (sd.getStorageDirType().isOfType(NameNodeDirType.EDITS)) {
-      for (FoundEditLog log : editLogs) {
+      for (EditLogFile log : editLogs) {
         addEditLog(log);
       }
     } else if (!editLogs.isEmpty()){
@@ -133,47 +130,12 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
     isUpgradeFinalized = isUpgradeFinalized && !sd.getPreviousDir().exists();
   }
 
-  static List<FoundEditLog> matchEditLogs(File[] filesInStorage) {
-    List<FoundEditLog> ret = Lists.newArrayList();
-    for (File f : filesInStorage) {
-      String name = f.getName();
-      // Check for edits
-      Matcher editsMatch = EDITS_REGEX.matcher(name);
-      if (editsMatch.matches()) {
-        try {
-          long startTxId = Long.valueOf(editsMatch.group(1));
-          long endTxId = Long.valueOf(editsMatch.group(2));
-          ret.add(new FoundEditLog(f, startTxId, endTxId));
-        } catch (NumberFormatException nfe) {
-          LOG.error("Edits file " + f + " has improperly formatted " +
-                    "transaction ID");
-          // skip
-        }          
-      }
-      
-      // Check for in-progress edits
-      Matcher inProgressEditsMatch = EDITS_INPROGRESS_REGEX.matcher(name);
-      if (inProgressEditsMatch.matches()) {
-        try {
-          long startTxId = Long.valueOf(inProgressEditsMatch.group(1));
-          ret.add(
-            new FoundEditLog(f, startTxId, FoundEditLog.UNKNOWN_END));
-        } catch (NumberFormatException nfe) {
-          LOG.error("In-progress edits file " + f + " has improperly " +
-                    "formatted transaction ID");
-          // skip
-        }          
-      }
-    }
-    return ret;
-  }
-
-  private void addEditLog(FoundEditLog foundEditLog) {
+  private void addEditLog(EditLogFile foundEditLog) {
     foundEditLogs.add(foundEditLog);
-    LogGroup group = logGroups.get(foundEditLog.startTxId);
+    LogGroup group = logGroups.get(foundEditLog.getFirstTxId());
     if (group == null) {
-      group = new LogGroup(foundEditLog.startTxId);
-      logGroups.put(foundEditLog.startTxId, group);
+      group = new LogGroup(foundEditLog.getFirstTxId());
+      logGroups.put(foundEditLog.getFirstTxId(), group);
     }
     group.add(foundEditLog);
   }
@@ -191,9 +153,9 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
    * 
    * Returns null if no images were found.
    */
-  FoundFSImage getLatestImage() {
-    FoundFSImage ret = null;
-    for (FoundFSImage img : foundImages) {
+  FSImageFile getLatestImage() {
+    FSImageFile ret = null;
+    for (FSImageFile img : foundImages) {
       if (ret == null || img.txId > ret.txId) {
         ret = img;
       }
@@ -201,11 +163,11 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
     return ret;
   }
   
-  public List<FoundFSImage> getFoundImages() {
+  public List<FSImageFile> getFoundImages() {
     return ImmutableList.copyOf(foundImages);
   }
   
-  public List<FoundEditLog> getFoundEditLogs() {
+  public List<EditLogFile> getEditLogFiles() {
     return ImmutableList.copyOf(foundEditLogs);
   }
 
@@ -215,7 +177,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
       throw new FileNotFoundException("No valid image files found");
     }
 
-    FoundFSImage recoveryImage = getLatestImage();
+    FSImageFile recoveryImage = getLatestImage();
     LogLoadPlan logPlan = createLogLoadPlan(recoveryImage.txId, Long.MAX_VALUE);
 
     return new TransactionalLoadPlan(recoveryImage,
@@ -233,7 +195,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
   LogLoadPlan createLogLoadPlan(long sinceTxId, long maxStartTxId) throws IOException {
     long expectedTxId = sinceTxId + 1;
     
-    List<FoundEditLog> recoveryLogs = new ArrayList<FoundEditLog>();
+    List<EditLogFile> recoveryLogs = new ArrayList<EditLogFile>();
     
     SortedMap<Long, LogGroup> tailGroups = logGroups.tailMap(expectedTxId);
     if (logGroups.size() > tailGroups.size()) {
@@ -312,10 +274,10 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
     for (LogGroup g : logGroups.values()) {
       if (!g.hasFinalized) continue;
 
-      FoundEditLog fel = g.getBestNonCorruptLog();
+      EditLogFile fel = g.getBestNonCorruptLog();
       if (fel.getLastTxId() < sinceTxId) continue;
       
-      logs.add(new RemoteEditLog(fel.getStartTxId(),
+      logs.add(new RemoteEditLog(fel.getFirstTxId(),
           fel.getLastTxId()));
     }
     
@@ -330,7 +292,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
    */
   static class LogGroup {
     long startTxId;
-    List<FoundEditLog> logs = new ArrayList<FoundEditLog>();;
+    List<EditLogFile> logs = new ArrayList<EditLogFile>();;
     private Set<Long> endTxIds = new TreeSet<Long>();
     private boolean hasInProgress = false;
     private boolean hasFinalized = false;
@@ -339,15 +301,15 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
       this.startTxId = startTxId;
     }
     
-    FoundEditLog getBestNonCorruptLog() {
+    EditLogFile getBestNonCorruptLog() {
       // First look for non-corrupt finalized logs
-      for (FoundEditLog log : logs) {
+      for (EditLogFile log : logs) {
         if (!log.isCorrupt() && !log.isInProgress()) {
           return log;
         }
       }
       // Then look for non-corrupt in-progress logs
-      for (FoundEditLog log : logs) {
+      for (EditLogFile log : logs) {
         if (!log.isCorrupt()) {
           return log;
         }
@@ -364,7 +326,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
      * @return true if we can determine the last txid in this log group.
      */
     boolean hasKnownLastTxId() {
-      for (FoundEditLog log : logs) {
+      for (EditLogFile log : logs) {
         if (!log.isInProgress()) {
           return true;
         }
@@ -378,24 +340,24 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
      *                               {@see #hasKnownLastTxId()}
      */
     long getLastTxId() {
-      for (FoundEditLog log : logs) {
+      for (EditLogFile log : logs) {
         if (!log.isInProgress()) {
-          return log.lastTxId;
+          return log.getLastTxId();
         }
       }
       throw new IllegalStateException("LogGroup only has in-progress logs");
     }
 
     
-    void add(FoundEditLog log) {
-      assert log.getStartTxId() == startTxId;
+    void add(EditLogFile log) {
+      assert log.getFirstTxId() == startTxId;
       logs.add(log);
       
       if (log.isInProgress()) {
         hasInProgress = true;
       } else {
         hasFinalized = true;
-        endTxIds.add(log.lastTxId);
+        endTxIds.add(log.getLastTxId());
       }
     }
     
@@ -422,7 +384,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
      * The in-progress logs in this case should be considered corrupt.
      */
     private void planMixedLogRecovery() throws IOException {
-      for (FoundEditLog log : logs) {
+      for (EditLogFile log : logs) {
         if (log.isInProgress()) {
           LOG.warn("Log at " + log.getFile() + " is in progress, but " +
                    "other logs starting at the same txid " + startTxId +
@@ -446,7 +408,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
                "crash)");
       if (logs.size() == 1) {
         // Only one log, it's our only choice!
-        FoundEditLog log = logs.get(0);
+        EditLogFile log = logs.get(0);
         if (log.validateLog().numTransactions == 0) {
           // If it has no transactions, we should consider it corrupt just
           // to be conservative.
@@ -459,7 +421,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
       }
 
       long maxValidTxnCount = Long.MIN_VALUE;
-      for (FoundEditLog log : logs) {
+      for (EditLogFile log : logs) {
         long validTxnCount = log.validateLog().numTransactions;
         LOG.warn("  Log " + log.getFile() +
             " valid txns=" + validTxnCount +
@@ -467,7 +429,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
         maxValidTxnCount = Math.max(maxValidTxnCount, validTxnCount);
       }        
 
-      for (FoundEditLog log : logs) {
+      for (EditLogFile log : logs) {
         long txns = log.validateLog().numTransactions;
         if (txns < maxValidTxnCount) {
           LOG.warn("Marking log at " + log.getFile() + " as corrupt since " +
@@ -499,7 +461,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
     }
 
     void recover() throws IOException {
-      for (FoundEditLog log : logs) {
+      for (EditLogFile log : logs) {
         if (log.isCorrupt()) {
           log.moveAsideCorruptFile();
         } else if (log.isInProgress()) {
@@ -508,131 +470,12 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
       }
     }    
   }
-
-  /**
-   * Record of an image that has been located and had its filename parsed.
-   */
-  static class FoundFSImage {
-    final StorageDirectory sd;    
-    final long txId;
-    private final File file;
-    
-    FoundFSImage(StorageDirectory sd, File file, long txId) {
-      assert txId >= 0 : "Invalid txid on " + file +": " + txId;
-      
-      this.sd = sd;
-      this.txId = txId;
-      this.file = file;
-    } 
-    
-    File getFile() {
-      return file;
-    }
-
-    public long getTxId() {
-      return txId;
-    }
-    
-    @Override
-    public String toString() {
-      return file.toString();
-    }
-  }
   
-  /**
-   * Record of an edit log that has been located and had its filename parsed.
-   */
-  static class FoundEditLog {
-    File file;
-    final long startTxId;
-    long lastTxId;
-    
-    private EditLogValidation cachedValidation = null;
-    private boolean isCorrupt = false;
-    
-    static final long UNKNOWN_END = -1;
-    
-    FoundEditLog(File file,
-        long startTxId, long endTxId) {
-      assert endTxId == UNKNOWN_END || endTxId >= startTxId;
-      assert startTxId > 0;
-      assert file != null;
-      
-      this.startTxId = startTxId;
-      this.lastTxId = endTxId;
-      this.file = file;
-    }
-    
-    public void finalizeLog() throws IOException {
-      long numTransactions = validateLog().numTransactions;
-      long lastTxId = startTxId + numTransactions - 1;
-      File dst = new File(file.getParentFile(),
-          NNStorage.getFinalizedEditsFileName(startTxId, lastTxId));
-      LOG.info("Finalizing edits log " + file + " by renaming to "
-          + dst.getName());
-      if (!file.renameTo(dst)) {
-        throw new IOException("Couldn't finalize log " +
-            file + " to " + dst);
-      }
-      this.lastTxId = lastTxId;
-      file = dst;
-    }
-
-    long getStartTxId() {
-      return startTxId;
-    }
-    
-    long getLastTxId() {
-      return lastTxId;
-    }
-
-    EditLogValidation validateLog() throws IOException {
-      if (cachedValidation == null) {
-        cachedValidation = EditLogFileInputStream.validateEditLog(file);
-      }
-      return cachedValidation;
-    }
-
-    boolean isInProgress() {
-      return (lastTxId == UNKNOWN_END);
-    }
-
-    File getFile() {
-      return file;
-    }
-    
-    void markCorrupt() {
-      isCorrupt = true;
-    }
-    
-    boolean isCorrupt() {
-      return isCorrupt;
-    }
-
-    void moveAsideCorruptFile() throws IOException {
-      assert isCorrupt;
-    
-      File src = file;
-      File dst = new File(src.getParent(), src.getName() + ".corrupt");
-      boolean success = src.renameTo(dst);
-      if (!success) {
-        throw new IOException(
-          "Couldn't rename corrupt log " + src + " to " + dst);
-      }
-      file = dst;
-    }
-    
-    @Override
-    public String toString() {
-      return file.toString();
-    }
-  }
-
   static class TransactionalLoadPlan extends LoadPlan {
-    final FoundFSImage image;
+    final FSImageFile image;
     final LogLoadPlan logPlan;
     
-    public TransactionalLoadPlan(FoundFSImage image,
+    public TransactionalLoadPlan(FSImageFile image,
         LogLoadPlan logPlan) {
       super();
       this.image = image;
@@ -662,10 +505,10 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
   }
   
   static class LogLoadPlan {
-    final List<FoundEditLog> editLogs;
+    final List<EditLogFile> editLogs;
     final List<LogGroup> logGroupsToRecover;
     
-    LogLoadPlan(List<FoundEditLog> editLogs,
+    LogLoadPlan(List<EditLogFile> editLogs,
         List<LogGroup> logGroupsToRecover) {
       this.editLogs = editLogs;
       this.logGroupsToRecover = logGroupsToRecover;
@@ -679,7 +522,7 @@ class FSImageTransactionalStorageInspector extends FSImageStorageInspector {
 
     public List<File> getEditsFiles() {
       List<File> ret = new ArrayList<File>();
-      for (FoundEditLog log : editLogs) {
+      for (EditLogFile log : editLogs) {
         ret.add(log.getFile());
       }
       return ret;

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/FileJournalManager.java

@@ -23,14 +23,20 @@ import org.apache.commons.logging.LogFactory;
 import java.io.File;
 import java.io.IOException;
 import java.util.List;
+import java.util.Comparator;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 import org.apache.hadoop.fs.FileUtil;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundEditLog;
 import org.apache.hadoop.hdfs.server.namenode.NNStorageRetentionManager.StoragePurger;
+import org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader.EditLogValidation;
+import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeFile;
 
 import com.google.common.annotations.VisibleForTesting;
 import com.google.common.base.Preconditions;
+import com.google.common.collect.Lists;
+import com.google.common.collect.ComparisonChain;
 
 /**
  * Journal manager for the common case of edits files being written
@@ -45,6 +51,15 @@ class FileJournalManager implements JournalManager {
   private final StorageDirectory sd;
   private int outputBufferCapacity = 512*1024;
 
+  private static final Pattern EDITS_REGEX = Pattern.compile(
+    NameNodeFile.EDITS.getName() + "_(\\d+)-(\\d+)");
+  private static final Pattern EDITS_INPROGRESS_REGEX = Pattern.compile(
+    NameNodeFile.EDITS_INPROGRESS.getName() + "_(\\d+)");
+
+  @VisibleForTesting
+  StoragePurger purger
+    = new NNStorageRetentionManager.DeletionStoragePurger();
+
   public FileJournalManager(StorageDirectory sd) {
     this.sd = sd;
   }
@@ -91,13 +106,13 @@ class FileJournalManager implements JournalManager {
   }
 
   @Override
-  public void purgeLogsOlderThan(long minTxIdToKeep, StoragePurger purger)
+  public void purgeLogsOlderThan(long minTxIdToKeep)
       throws IOException {
     File[] files = FileUtil.listFiles(sd.getCurrentDir());
-    List<FoundEditLog> editLogs = 
-      FSImageTransactionalStorageInspector.matchEditLogs(files);
-    for (FoundEditLog log : editLogs) {
-      if (log.getStartTxId() < minTxIdToKeep &&
+    List<EditLogFile> editLogs = 
+      FileJournalManager.matchEditLogs(files);
+    for (EditLogFile log : editLogs) {
+      if (log.getFirstTxId() < minTxIdToKeep &&
           log.getLastTxId() < minTxIdToKeep) {
         purger.purgeLog(log);
       }
@@ -111,4 +126,139 @@ class FileJournalManager implements JournalManager {
     return new EditLogFileInputStream(f);
   }
 
+  static List<EditLogFile> matchEditLogs(File[] filesInStorage) {
+    List<EditLogFile> ret = Lists.newArrayList();
+    for (File f : filesInStorage) {
+      String name = f.getName();
+      // Check for edits
+      Matcher editsMatch = EDITS_REGEX.matcher(name);
+      if (editsMatch.matches()) {
+        try {
+          long startTxId = Long.valueOf(editsMatch.group(1));
+          long endTxId = Long.valueOf(editsMatch.group(2));
+          ret.add(new EditLogFile(f, startTxId, endTxId));
+        } catch (NumberFormatException nfe) {
+          LOG.error("Edits file " + f + " has improperly formatted " +
+                    "transaction ID");
+          // skip
+        }          
+      }
+      
+      // Check for in-progress edits
+      Matcher inProgressEditsMatch = EDITS_INPROGRESS_REGEX.matcher(name);
+      if (inProgressEditsMatch.matches()) {
+        try {
+          long startTxId = Long.valueOf(inProgressEditsMatch.group(1));
+          ret.add(
+            new EditLogFile(f, startTxId, EditLogFile.UNKNOWN_END));
+        } catch (NumberFormatException nfe) {
+          LOG.error("In-progress edits file " + f + " has improperly " +
+                    "formatted transaction ID");
+          // skip
+        }          
+      }
+    }
+    return ret;
+  }
+
+  /**
+   * Record of an edit log that has been located and had its filename parsed.
+   */
+  static class EditLogFile {
+    private File file;
+    private final long firstTxId;
+    private long lastTxId;
+    
+    private EditLogValidation cachedValidation = null;
+    private boolean isCorrupt = false;
+    
+    static final long UNKNOWN_END = -1;
+    
+    final static Comparator<EditLogFile> COMPARE_BY_START_TXID 
+      = new Comparator<EditLogFile>() {
+      public int compare(EditLogFile a, EditLogFile b) {
+        return ComparisonChain.start()
+        .compare(a.getFirstTxId(), b.getFirstTxId())
+        .compare(a.getLastTxId(), b.getLastTxId())
+        .result();
+      }
+    };
+
+    EditLogFile(File file,
+        long firstTxId, long lastTxId) {
+      assert lastTxId == UNKNOWN_END || lastTxId >= firstTxId;
+      assert firstTxId > 0;
+      assert file != null;
+      
+      this.firstTxId = firstTxId;
+      this.lastTxId = lastTxId;
+      this.file = file;
+    }
+    
+    public void finalizeLog() throws IOException {
+      long numTransactions = validateLog().numTransactions;
+      long lastTxId = firstTxId + numTransactions - 1;
+      File dst = new File(file.getParentFile(),
+          NNStorage.getFinalizedEditsFileName(firstTxId, lastTxId));
+      LOG.info("Finalizing edits log " + file + " by renaming to "
+          + dst.getName());
+      if (!file.renameTo(dst)) {
+        throw new IOException("Couldn't finalize log " +
+            file + " to " + dst);
+      }
+      this.lastTxId = lastTxId;
+      file = dst;
+    }
+
+    long getFirstTxId() {
+      return firstTxId;
+    }
+    
+    long getLastTxId() {
+      return lastTxId;
+    }
+
+    EditLogValidation validateLog() throws IOException {
+      if (cachedValidation == null) {
+        cachedValidation = EditLogFileInputStream.validateEditLog(file);
+      }
+      return cachedValidation;
+    }
+
+    boolean isInProgress() {
+      return (lastTxId == UNKNOWN_END);
+    }
+
+    File getFile() {
+      return file;
+    }
+    
+    void markCorrupt() {
+      isCorrupt = true;
+    }
+    
+    boolean isCorrupt() {
+      return isCorrupt;
+    }
+
+    void moveAsideCorruptFile() throws IOException {
+      assert isCorrupt;
+    
+      File src = file;
+      File dst = new File(src.getParent(), src.getName() + ".corrupt");
+      boolean success = src.renameTo(dst);
+      if (!success) {
+        throw new IOException(
+          "Couldn't rename corrupt log " + src + " to " + dst);
+      }
+      file = dst;
+    }
+    
+    @Override
+    public String toString() {
+      return String.format("EditLogFile(file=%s,first=%019d,last=%019d,"
+                           +"inProgress=%b,corrupt=%b)", file.toString(),
+                           firstTxId, lastTxId, isInProgress(), isCorrupt);
+    }
+  }
 }

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/JournalManager.java

@@ -55,7 +55,7 @@ interface JournalManager {
    * @param purger the purging implementation to use
    * @throws IOException if purging fails
    */
-  void purgeLogsOlderThan(long minTxIdToKeep, StoragePurger purger)
+  void purgeLogsOlderThan(long minTxIdToKeep)
     throws IOException;
 
   /**

hdfs/src/java/org/apache/hadoop/hdfs/server/namenode/NNStorageRetentionManager.java

@@ -27,8 +27,8 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundEditLog;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundFSImage;
+import org.apache.hadoop.hdfs.server.namenode.FSImageStorageInspector.FSImageFile;
+import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
 import org.apache.hadoop.hdfs.util.MD5FileUtils;
 
 import com.google.common.collect.Lists;
@@ -80,14 +80,14 @@ public class NNStorageRetentionManager {
     // If fsimage_N is the image we want to keep, then we need to keep
     // all txns > N. We can remove anything < N+1, since fsimage_N
     // reflects the state up to and including N.
-    editLog.purgeLogsOlderThan(minImageTxId + 1, purger);
+    editLog.purgeLogsOlderThan(minImageTxId + 1);
   }
   
   private void purgeCheckpointsOlderThan(
       FSImageTransactionalStorageInspector inspector,
       long minTxId) {
-    for (FoundFSImage image : inspector.getFoundImages()) {
-      if (image.getTxId() < minTxId) {
+    for (FSImageFile image : inspector.getFoundImages()) {
+      if (image.getCheckpointTxId() < minTxId) {
         LOG.info("Purging old image " + image);
         purger.purgeImage(image);
       }
@@ -101,10 +101,10 @@ public class NNStorageRetentionManager {
    */
   private long getImageTxIdToRetain(FSImageTransactionalStorageInspector inspector) {
       
-    List<FoundFSImage> images = inspector.getFoundImages();
+    List<FSImageFile> images = inspector.getFoundImages();
     TreeSet<Long> imageTxIds = Sets.newTreeSet();
-    for (FoundFSImage image : images) {
-      imageTxIds.add(image.getTxId());
+    for (FSImageFile image : images) {
+      imageTxIds.add(image.getCheckpointTxId());
     }
     
     List<Long> imageTxIdsList = Lists.newArrayList(imageTxIds);
@@ -124,18 +124,18 @@ public class NNStorageRetentionManager {
    * Interface responsible for disposing of old checkpoints and edit logs.
    */
   static interface StoragePurger {
-    void purgeLog(FoundEditLog log);
-    void purgeImage(FoundFSImage image);
+    void purgeLog(EditLogFile log);
+    void purgeImage(FSImageFile image);
   }
   
   static class DeletionStoragePurger implements StoragePurger {
     @Override
-    public void purgeLog(FoundEditLog log) {
+    public void purgeLog(EditLogFile log) {
       deleteOrWarn(log.getFile());
     }
 
     @Override
-    public void purgeImage(FoundFSImage image) {
+    public void purgeImage(FSImageFile image) {
       deleteOrWarn(image.getFile());
       deleteOrWarn(MD5FileUtils.getDigestFileForFile(image.getFile()));
     }

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/FSImageTestUtil.java

@@ -25,7 +25,6 @@ import java.io.RandomAccessFile;
 import java.net.URI;
 import java.util.ArrayList;
 import java.util.Collections;
-import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -34,15 +33,14 @@ import java.util.Set;
 
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundEditLog;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundFSImage;
+import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
+import org.apache.hadoop.hdfs.server.namenode.FSImageStorageInspector.FSImageFile;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
 import org.apache.hadoop.hdfs.util.MD5FileUtils;
 import org.apache.hadoop.io.IOUtils;
 import org.mockito.Mockito;
 
 import com.google.common.base.Joiner;
-import com.google.common.collect.ComparisonChain;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
@@ -154,9 +152,9 @@ public abstract class FSImageTestUtil {
     for (File dir : dirs) {
       FSImageTransactionalStorageInspector inspector =
         inspectStorageDirectory(dir, NameNodeDirType.IMAGE);
-      FoundFSImage latestImage = inspector.getLatestImage();
+      FSImageFile latestImage = inspector.getLatestImage();
       assertNotNull("No image in " + dir, latestImage);      
-      long thisTxId = latestImage.getTxId();
+      long thisTxId = latestImage.getCheckpointTxId();
       if (imageTxId != -1 && thisTxId != imageTxId) {
         fail("Storage directory " + dir + " does not have the same " +
             "last image index " + imageTxId + " as another");
@@ -283,7 +281,7 @@ public abstract class FSImageTestUtil {
       new FSImageTransactionalStorageInspector();
     inspector.inspectDirectory(sd);
 
-    FoundFSImage latestImage = inspector.getLatestImage();
+    FSImageFile latestImage = inspector.getLatestImage();
     return (latestImage == null) ? null : latestImage.getFile();
   }
 
@@ -316,23 +314,15 @@ public abstract class FSImageTestUtil {
    * @return the latest edits log, finalized or otherwise, from the given
    * storage directory.
    */
-  public static FoundEditLog findLatestEditsLog(StorageDirectory sd)
+  public static EditLogFile findLatestEditsLog(StorageDirectory sd)
   throws IOException {
     FSImageTransactionalStorageInspector inspector =
       new FSImageTransactionalStorageInspector();
     inspector.inspectDirectory(sd);
     
-    List<FoundEditLog> foundEditLogs = Lists.newArrayList(
-        inspector.getFoundEditLogs());
-    return Collections.max(foundEditLogs, new Comparator<FoundEditLog>() {
-      @Override
-      public int compare(FoundEditLog a, FoundEditLog b) {
-        return ComparisonChain.start()
-          .compare(a.getStartTxId(), b.getStartTxId())
-          .compare(a.getLastTxId(), b.getLastTxId())
-          .result();
-      }
-    });
+    List<EditLogFile> foundEditLogs = Lists.newArrayList(
+        inspector.getEditLogFiles());
+    return Collections.max(foundEditLogs, EditLogFile.COMPARE_BY_START_TXID);
   }
 
   /**

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestBackupNode.java

@@ -33,7 +33,7 @@ import org.apache.hadoop.hdfs.HdfsConfiguration;
 import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.server.common.HdfsConstants.StartupOption;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundEditLog;
+import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
 import org.apache.hadoop.hdfs.DFSConfigKeys;
 import org.apache.hadoop.test.GenericTestUtils;
 import org.apache.log4j.Level;
@@ -163,8 +163,8 @@ public class TestBackupNode extends TestCase {
       
       // When shutting down the BN, it shouldn't finalize logs that are
       // still open on the NN
-      FoundEditLog editsLog = FSImageTestUtil.findLatestEditsLog(sd);
-      assertEquals(editsLog.getStartTxId(),
+      EditLogFile editsLog = FSImageTestUtil.findLatestEditsLog(sd);
+      assertEquals(editsLog.getFirstTxId(),
           nn.getFSImage().getEditLog().getCurSegmentTxId());
       assertTrue("Should not have finalized " + editsLog,
           editsLog.isInProgress());

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestCheckPointForSecurityTokens.java

@@ -28,7 +28,7 @@ import org.apache.hadoop.hdfs.MiniDFSCluster;
 import org.apache.hadoop.hdfs.protocol.FSConstants.SafeModeAction;
 import org.apache.hadoop.hdfs.security.token.delegation.DelegationTokenIdentifier;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundEditLog;
+import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
 import org.apache.hadoop.hdfs.tools.DFSAdmin;
 import org.apache.hadoop.io.Text;
 import org.apache.hadoop.security.UserGroupInformation;
@@ -82,7 +82,7 @@ public class TestCheckPointForSecurityTokens {
       // verify that the edits file is NOT empty
       NameNode nn = cluster.getNameNode();
       for (StorageDirectory sd : nn.getFSImage().getStorage().dirIterable(null)) {
-        FoundEditLog log = FSImageTestUtil.findLatestEditsLog(sd);
+        EditLogFile log = FSImageTestUtil.findLatestEditsLog(sd);
         assertTrue(log.isInProgress());
         assertEquals("In-progress log " + log + " should have 5 transactions",
             5, log.validateLog().numTransactions);
@@ -97,7 +97,7 @@ public class TestCheckPointForSecurityTokens {
       }
       // verify that the edits file is empty except for the START txn
       for (StorageDirectory sd : nn.getFSImage().getStorage().dirIterable(null)) {
-        FoundEditLog log = FSImageTestUtil.findLatestEditsLog(sd);
+        EditLogFile log = FSImageTestUtil.findLatestEditsLog(sd);
         assertTrue(log.isInProgress());
         assertEquals("In-progress log " + log + " should only have START txn",
             1, log.validateLog().numTransactions);

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestFSImageStorageInspector.java

@@ -36,8 +36,8 @@ import static org.apache.hadoop.hdfs.server.namenode.NNStorage.getInProgressEdit
 import static org.apache.hadoop.hdfs.server.namenode.NNStorage.getFinalizedEditsFileName;
 import static org.apache.hadoop.hdfs.server.namenode.NNStorage.getImageFileName;
 
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundEditLog;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundFSImage;
+import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
+import org.apache.hadoop.hdfs.server.namenode.FSImageStorageInspector.FSImageFile;
 import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.TransactionalLoadPlan;
 import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.LogGroup;
 import org.apache.hadoop.hdfs.server.namenode.FSImageStorageInspector.LoadPlan;
@@ -72,7 +72,7 @@ public class TestFSImageStorageInspector {
     assertEquals(2, inspector.foundImages.size());
     assertTrue(inspector.foundEditLogs.get(1).isInProgress());
     
-    FoundFSImage latestImage = inspector.getLatestImage();
+    FSImageFile latestImage = inspector.getLatestImage();
     assertEquals(456, latestImage.txId);
     assertSame(mockDir, latestImage.sd);
     assertTrue(inspector.isUpgradeFinalized());
@@ -203,7 +203,7 @@ public class TestFSImageStorageInspector {
 
     LogGroup lg = inspector.logGroups.get(123L);
     assertEquals(3, lg.logs.size());
-    FoundEditLog inProgressLog = lg.logs.get(2);
+    EditLogFile inProgressLog = lg.logs.get(2);
     assertTrue(inProgressLog.isInProgress());
     
     LoadPlan plan = inspector.createLoadPlan();
@@ -282,7 +282,7 @@ public class TestFSImageStorageInspector {
     assertTrue(lg.logs.get(2).isCorrupt());
     
     // Calling recover should move it aside
-    FoundEditLog badLog = lg.logs.get(2);
+    EditLogFile badLog = lg.logs.get(2);
     Mockito.doNothing().when(badLog).moveAsideCorruptFile();
     Mockito.doNothing().when(lg.logs.get(0)).finalizeLog();
     Mockito.doNothing().when(lg.logs.get(1)).finalizeLog();
@@ -303,12 +303,12 @@ public class TestFSImageStorageInspector {
       String path, int numValidTransactions) throws IOException {
     
     for (LogGroup lg : inspector.logGroups.values()) {
-      List<FoundEditLog> logs = lg.logs;
+      List<EditLogFile> logs = lg.logs;
       for (int i = 0; i < logs.size(); i++) {
-        FoundEditLog log = logs.get(i);
-        if (log.file.getPath().equals(path)) {
+        EditLogFile log = logs.get(i);
+        if (log.getFile().getPath().equals(path)) {
           // mock out its validation
-          FoundEditLog spyLog = spy(log);
+          EditLogFile spyLog = spy(log);
           doReturn(new FSEditLogLoader.EditLogValidation(-1, numValidTransactions))
             .when(spyLog).validateLog();
           logs.set(i, spyLog);
@@ -356,7 +356,7 @@ public class TestFSImageStorageInspector {
     // Check plan
     TransactionalLoadPlan plan =
       (TransactionalLoadPlan)inspector.createLoadPlan();
-    FoundFSImage pickedImage = plan.image;
+    FSImageFile pickedImage = plan.image;
     assertEquals(456, pickedImage.txId);
     assertSame(mockImageDir2, pickedImage.sd);
     assertEquals(new File("/foo2/current/" + getImageFileName(456)),

hdfs/src/test/hdfs/org/apache/hadoop/hdfs/server/namenode/TestNNStorageRetentionManager.java

@@ -24,8 +24,8 @@ import java.util.Set;
 
 import org.apache.hadoop.conf.Configuration;
 import org.apache.hadoop.hdfs.server.common.Storage.StorageDirectory;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundEditLog;
-import org.apache.hadoop.hdfs.server.namenode.FSImageTransactionalStorageInspector.FoundFSImage;
+import org.apache.hadoop.hdfs.server.namenode.FileJournalManager.EditLogFile;
+import org.apache.hadoop.hdfs.server.namenode.FSImageStorageInspector.FSImageFile;
 import org.apache.hadoop.hdfs.server.namenode.NNStorage.NameNodeDirType;
 import static org.apache.hadoop.hdfs.server.namenode.NNStorage.getInProgressEditsFileName;
 import static org.apache.hadoop.hdfs.server.namenode.NNStorage.getFinalizedEditsFileName;
@@ -168,14 +168,14 @@ public class TestNNStorageRetentionManager {
 
     StoragePurger mockPurger =
       Mockito.mock(NNStorageRetentionManager.StoragePurger.class);
-    ArgumentCaptor<FoundFSImage> imagesPurgedCaptor =
-      ArgumentCaptor.forClass(FoundFSImage.class);    
-    ArgumentCaptor<FoundEditLog> logsPurgedCaptor =
-      ArgumentCaptor.forClass(FoundEditLog.class);    
+    ArgumentCaptor<FSImageFile> imagesPurgedCaptor =
+      ArgumentCaptor.forClass(FSImageFile.class);    
+    ArgumentCaptor<EditLogFile> logsPurgedCaptor =
+      ArgumentCaptor.forClass(EditLogFile.class);    
 
     // Ask the manager to purge files we don't need any more
     new NNStorageRetentionManager(conf,
-        tc.mockStorage(), tc.mockEditLog(), mockPurger)
+        tc.mockStorage(), tc.mockEditLog(mockPurger), mockPurger)
       .purgeOldStorage();
     
     // Verify that it asked the purger to remove the correct files
@@ -186,7 +186,7 @@ public class TestNNStorageRetentionManager {
 
     // Check images
     Set<String> purgedPaths = Sets.newHashSet();
-    for (FoundFSImage purged : imagesPurgedCaptor.getAllValues()) {
+    for (FSImageFile purged : imagesPurgedCaptor.getAllValues()) {
       purgedPaths.add(purged.getFile().toString());
     }    
     Assert.assertEquals(Joiner.on(",").join(tc.expectedPurgedImages),
@@ -194,7 +194,7 @@ public class TestNNStorageRetentionManager {
 
     // Check images
     purgedPaths.clear();
-    for (FoundEditLog purged : logsPurgedCaptor.getAllValues()) {
+    for (EditLogFile purged : logsPurgedCaptor.getAllValues()) {
       purgedPaths.add(purged.getFile().toString());
     }    
     Assert.assertEquals(Joiner.on(",").join(tc.expectedPurgedLogs),
@@ -256,13 +256,14 @@ public class TestNNStorageRetentionManager {
       return mockStorageForDirs(sds.toArray(new StorageDirectory[0]));
     }
     
-    public FSEditLog mockEditLog() {
+    public FSEditLog mockEditLog(StoragePurger purger) {
       final List<JournalManager> jms = Lists.newArrayList();
       for (FakeRoot root : dirRoots.values()) {
         if (!root.type.isOfType(NameNodeDirType.EDITS)) continue;
         
         FileJournalManager fjm = new FileJournalManager(
             root.mockStorageDir());
+        fjm.purger = purger;
         jms.add(fjm);
       }
 
@@ -272,17 +273,15 @@ public class TestNNStorageRetentionManager {
         @Override
         public Void answer(InvocationOnMock invocation) throws Throwable {
           Object[] args = invocation.getArguments();
-          assert args.length == 2;
+          assert args.length == 1;
           long txId = (Long) args[0];
-          StoragePurger purger = (StoragePurger) args[1];
           
           for (JournalManager jm : jms) {
-            jm.purgeLogsOlderThan(txId, purger);
+            jm.purgeLogsOlderThan(txId);
           }
           return null;
         }
-      }).when(mockLog).purgeLogsOlderThan(
-          Mockito.anyLong(), (StoragePurger) Mockito.anyObject());
+      }).when(mockLog).purgeLogsOlderThan(Mockito.anyLong());
       return mockLog;
     }
   }