HDFS-3474. Cleanup Exception handling in BookKeeper journal manager. Contributed by Ivan Kelly.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1344386 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal/src/main/java/org/apache/hadoop/contrib/bkjournal/BookKeeperEditLogInputStream.java

@@ -28,6 +28,7 @@ import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp;
 import org.apache.hadoop.hdfs.server.namenode.FSEditLogLoader;
 import org.apache.bookkeeper.client.LedgerHandle;
 import org.apache.bookkeeper.client.LedgerEntry;
+import org.apache.bookkeeper.client.BKException;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
@@ -104,8 +105,10 @@ class BookKeeperEditLogInputStream extends EditLogInputStream {
   public void close() throws IOException {
     try {
       lh.close();
-    } catch (Exception e) {
+    } catch (BKException e) {
       throw new IOException("Exception closing ledger", e);
+    } catch (InterruptedException e) {
+      throw new IOException("Interrupted closing ledger", e);
     }
   }
 
@@ -168,11 +171,8 @@ class BookKeeperEditLogInputStream extends EditLogInputStream {
         throws IOException {
       this.lh = lh;
       readEntries = firstBookKeeperEntry;
-      try {
-        maxEntry = lh.getLastAddConfirmed();
-      } catch (Exception e) {
-        throw new IOException("Error reading last entry id", e);
-      }
+
+      maxEntry = lh.getLastAddConfirmed();
     }
 
     /**
@@ -193,8 +193,10 @@ class BookKeeperEditLogInputStream extends EditLogInputStream {
             assert !entries.hasMoreElements();
             return e.getEntryInputStream();
         }
-      } catch (Exception e) {
+      } catch (BKException e) {
         throw new IOException("Error reading entries from bookkeeper", e);
+      } catch (InterruptedException e) {
+        throw new IOException("Interrupted reading entries from bookkeeper", e);
       }
       return null;
     }

hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal/src/main/java/org/apache/hadoop/contrib/bkjournal/BookKeeperJournalManager.java

@@ -188,8 +188,11 @@ public class BookKeeperJournalManager implements JournalManager {
 
       bkc = new BookKeeper(new ClientConfiguration(),
                            zkc);
-    } catch (Exception e) {
+    } catch (KeeperException e) {
       throw new IOException("Error initializing zk", e);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted while initializing bk journal manager",
+                            ie);
     }
 
     ci = new CurrentInprogress(zkc, currentInprogressNodePath);
@@ -211,6 +214,7 @@ public class BookKeeperJournalManager implements JournalManager {
       throw new IOException("We've already seen " + txId
           + ". A new stream cannot be created with it");
     }
+
     try {
       String existingInprogressNode = ci.read();
       if (null != existingInprogressNode
@@ -224,6 +228,15 @@ public class BookKeeperJournalManager implements JournalManager {
       currentLedger = bkc.createLedger(ensembleSize, quorumSize,
                                        BookKeeper.DigestType.MAC,
                                        digestpw.getBytes());
+    } catch (BKException bke) {
+      throw new IOException("Error creating ledger", bke);
+    } catch (KeeperException ke) {
+      throw new IOException("Error in zookeeper while creating ledger", ke);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted creating ledger", ie);
+    }
+
+    try {
       String znodePath = inprogressZNode(txId);
       EditLogLedgerMetadata l = new EditLogLedgerMetadata(znodePath,
           HdfsConstants.LAYOUT_VERSION,  currentLedger.getId(), txId);
@@ -239,21 +252,27 @@ public class BookKeeperJournalManager implements JournalManager {
       maxTxId.store(txId);
       ci.update(znodePath);
       return new BookKeeperEditLogOutputStream(conf, currentLedger);
-    } catch (Exception e) {
-      if (currentLedger != null) {
-        try {
-          long id = currentLedger.getId();
-          currentLedger.close();
-          bkc.deleteLedger(id);
-        } catch (Exception e2) {
-          //log & ignore, an IOException will be thrown soon
-          LOG.error("Error closing ledger", e2);
-        }
-      }
-      throw new IOException("Error creating ledger", e);
+    } catch (KeeperException ke) {
+      cleanupLedger(currentLedger);
+      throw new IOException("Error storing ledger metadata", ke);
     }
   }
 
+  private void cleanupLedger(LedgerHandle lh) {
+    try {
+      long id = currentLedger.getId();
+      currentLedger.close();
+      bkc.deleteLedger(id);
+    } catch (BKException bke) {
+      //log & ignore, an IOException will be thrown soon
+      LOG.error("Error closing ledger", bke);
+    } catch (InterruptedException ie) {
+      LOG.warn("Interrupted while closing ledger", ie);
+    }
+  }
+
+
+
   /**
    * Finalize a log segment. If the journal manager is currently
    * writing to a ledger, ensure that this is the ledger of the log segment
@@ -347,8 +366,11 @@ public class BookKeeperJournalManager implements JournalManager {
               l);
           s.skipTo(fromTxId);
           return s;
-        } catch (Exception e) {
+        } catch (BKException e) {
           throw new IOException("Could not open ledger for " + fromTxId, e);
+        } catch (InterruptedException ie) {
+          throw new IOException("Interrupted opening ledger for "
+                                         + fromTxId, ie);
         }
       }
     }
@@ -479,8 +501,10 @@ public class BookKeeperJournalManager implements JournalManager {
     try {
       bkc.close();
       zkc.close();
-    } catch (Exception e) {
-      throw new IOException("Couldn't close zookeeper client", e);
+    } catch (BKException bke) {
+      throw new IOException("Couldn't close bookkeeper client", bke);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted while closing journal manager", ie);
     }
   }
 
@@ -525,9 +549,12 @@ public class BookKeeperJournalManager implements JournalManager {
         op = in.readOp();
       }
       return endTxId;
-    } catch (Exception e) {
+    } catch (BKException e) {
       throw new IOException("Exception retreiving last tx id for ledger " + l,
                             e);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted while retreiving last tx id "
+                            + "for ledger " + l, ie);
     }
   }
 
@@ -542,8 +569,10 @@ public class BookKeeperJournalManager implements JournalManager {
       for (String n : ledgerNames) {
         ledgers.add(EditLogLedgerMetadata.read(zkc, ledgerPath + "/" + n));
       }
-    } catch (Exception e) {
+    } catch (KeeperException e) {
       throw new IOException("Exception reading ledger list from zk", e);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted getting list of ledgers from zk", ie);
     }
 
     Collections.sort(ledgers, EditLogLedgerMetadata.COMPARATOR);

hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal/src/main/java/org/apache/hadoop/contrib/bkjournal/CurrentInprogress.java

@@ -68,8 +68,10 @@ class CurrentInprogress {
           }
         }
       }
-    } catch (Exception e) {
+    } catch (KeeperException e) {
       throw new IOException("Exception accessing Zookeeper", e);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted accessing Zookeeper", ie);
     }
   }
 
@@ -158,4 +160,4 @@ class CurrentInprogress {
     LOG.info("Cleared the data from CurrentInprogress");
   }
 
-}
+}

hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal/src/main/java/org/apache/hadoop/contrib/bkjournal/EditLogLedgerMetadata.java

@@ -130,8 +130,10 @@ public class EditLogLedgerMetadata {
       }
     } catch(KeeperException.NoNodeException nne) {
       throw nne;
-    } catch(Exception e) {
-      throw new IOException("Error reading from zookeeper", e);
+    } catch(KeeperException ke) {
+      throw new IOException("Error reading from zookeeper", ke);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted reading from zookeeper", ie);
     }
   }
     
@@ -151,9 +153,11 @@ public class EditLogLedgerMetadata {
                  Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
     } catch (KeeperException.NodeExistsException nee) {
       throw nee;
-    } catch (Exception e) {
-      throw new IOException("Error creating ledger znode");
-    } 
+    } catch (KeeperException e) {
+      throw new IOException("Error creating ledger znode", e);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted creating ledger znode", ie);
+    }
   }
   
   boolean verify(ZooKeeper zkc, String path) {
@@ -164,9 +168,12 @@ public class EditLogLedgerMetadata {
                   + " against " + other);
       }
       return other == this;
-    } catch (Exception e) {
+    } catch (KeeperException e) {
       LOG.error("Couldn't verify data in " + path, e);
       return false;
+    } catch (IOException ie) {
+      LOG.error("Couldn't verify data in " + path, ie);
+      return false;
     }
   }
   

hadoop-hdfs-project/hadoop-hdfs/src/contrib/bkjournal/src/main/java/org/apache/hadoop/contrib/bkjournal/MaxTxId.java

@@ -20,6 +20,7 @@ package org.apache.hadoop.contrib.bkjournal;
 import java.io.IOException;
 import org.apache.zookeeper.ZooKeeper;
 import org.apache.zookeeper.CreateMode;
+import org.apache.zookeeper.KeeperException;
 import org.apache.zookeeper.ZooDefs.Ids;
 import org.apache.zookeeper.data.Stat;
 
@@ -58,8 +59,10 @@ class MaxTxId {
           zkc.create(path, txidStr.getBytes("UTF-8"), 
                      Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
         }
-      } catch (Exception e) {
+      } catch (KeeperException e) {
         throw new IOException("Error writing max tx id", e);
+      } catch (InterruptedException e) {
+        throw new IOException("Interrupted while writing max tx id", e);
       }
     }
   }
@@ -74,8 +77,10 @@ class MaxTxId {
         String txidString = new String(bytes, "UTF-8");
         return Long.valueOf(txidString);
       }
-    } catch (Exception e) {
+    } catch (KeeperException e) {
       throw new IOException("Error reading the max tx id from zk", e);
+    } catch (InterruptedException ie) {
+      throw new IOException("Interrupted while reading thr max tx id", ie);
     }
   }
 }