diff --git a/asterix-app/src/main/java/edu/uci/ics/asterix/aql/translator/AqlTranslator.java b/asterix-app/src/main/java/edu/uci/ics/asterix/aql/translator/AqlTranslator.java
index 8aba12a..418e0a6 100644
--- a/asterix-app/src/main/java/edu/uci/ics/asterix/aql/translator/AqlTranslator.java
+++ b/asterix-app/src/main/java/edu/uci/ics/asterix/aql/translator/AqlTranslator.java
@@ -1506,6 +1506,8 @@
 
     private void abort(Exception rootE, Exception parentE, MetadataTransactionContext mdTxnCtx) {
         try {
+            //TODO: remove stacktrace
+            rootE.printStackTrace();
             MetadataManager.INSTANCE.abortTransaction(mdTxnCtx);
         } catch (Exception e2) {
             parentE.addSuppressed(e2);
diff --git a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/bootstrap/MetadataBootstrap.java b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/bootstrap/MetadataBootstrap.java
index ca5e56c..3602974 100644
--- a/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/bootstrap/MetadataBootstrap.java
+++ b/asterix-metadata/src/main/java/edu/uci/ics/asterix/metadata/bootstrap/MetadataBootstrap.java
@@ -190,6 +190,8 @@
             MetadataManager.INSTANCE.commitTransaction(mdTxnCtx);
         } catch (Exception e) {
             try {
+                //TODO: remove stacktrace
+                e.printStackTrace();
                 MetadataManager.INSTANCE.abortTransaction(mdTxnCtx);
             } catch (Exception e2) {
                 e.addSuppressed(e2);
@@ -432,6 +434,8 @@
             }
         } catch (Exception e) {
             try {
+                //TODO: remove stacktrace
+                e.printStackTrace();
                 MetadataManager.INSTANCE.abortTransaction(mdTxnCtx);
             } catch (Exception e2) {
                 e.addSuppressed(e2);
diff --git a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/service/logging/LogPage.java b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/service/logging/LogPage.java
index 04200a7..f5c1264 100644
--- a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/service/logging/LogPage.java
+++ b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/service/logging/LogPage.java
@@ -19,6 +19,7 @@
 import java.nio.channels.FileChannel;
 import java.util.concurrent.LinkedBlockingQueue;
 import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.logging.Logger;
 
 import edu.uci.ics.asterix.common.exceptions.ACIDException;
 import edu.uci.ics.asterix.common.transactions.ILogPage;
@@ -27,6 +28,9 @@
 import edu.uci.ics.asterix.transaction.management.service.locking.LockManager;
 
 public class LogPage implements ILogPage {
+
+    public static final boolean IS_DEBUG_MODE = true;//true
+    private static final Logger LOGGER = Logger.getLogger(LogPage.class.getName());
     private final LockManager lockMgr;
     private final LogPageReader logPageReader;
     private final int logPageSize;
@@ -69,6 +73,9 @@
         }
         synchronized (this) {
             appendOffset += logRecord.getLogSize();
+            if (IS_DEBUG_MODE) {
+                LOGGER.info("append()| appendOffset: " + appendOffset);
+            }
             if (logRecord.getLogType() == LogType.JOB_COMMIT) {
                 logRecord.isFlushed(false);
                 syncCommitQ.offer(logRecord);
@@ -127,6 +134,10 @@
                 synchronized (this) {
                     if (appendOffset - flushOffset == 0 && !full.get()) {
                         try {
+                            if (IS_DEBUG_MODE) {
+                                LOGGER.info("flush()| appendOffset: " + appendOffset + ", flushOffset: " + flushOffset
+                                        + ", full: " + full.get());
+                            }
                             this.wait();
                             if (stop) {
                                 fileChannel.close();
@@ -160,6 +171,9 @@
                     flushLSN.set(flushLSN.get() + (endOffset - beginOffset));
                     flushLSN.notifyAll(); //notify to LogReaders if any
                 }
+                if (IS_DEBUG_MODE) {
+                    LOGGER.info("internalFlush()| flushOffset: " + flushOffset + ", flushLSN: " + flushLSN.get());
+                }
                 batchUnlock(beginOffset, endOffset);
             }
         } catch (Exception e) {
diff --git a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/service/logging/LogReader.java b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/service/logging/LogReader.java
index 70ae711..8c4f2ae 100644
--- a/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/service/logging/LogReader.java
+++ b/asterix-transactions/src/main/java/edu/uci/ics/asterix/transaction/management/service/logging/LogReader.java
@@ -17,6 +17,7 @@
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.nio.channels.FileChannel;
+import java.util.logging.Logger;
 
 import edu.uci.ics.asterix.common.exceptions.ACIDException;
 import edu.uci.ics.asterix.common.transactions.ILogReader;
@@ -25,6 +26,8 @@
 
 public class LogReader implements ILogReader {
 
+    public static final boolean IS_DEBUG_MODE = true;//true
+    private static final Logger LOGGER = Logger.getLogger(LogReader.class.getName());
     private final LogManager logMgr;
     private final long logFileSize;
     private final int logPageSize;
@@ -56,6 +59,9 @@
                     return;
                 }
                 try {
+                    if (IS_DEBUG_MODE) {
+                        LOGGER.info("initializeScan()| flushLSN: " + flushLSN.get() + ", readLSN: " + readLSN);
+                    }
                     flushLSN.wait();
                 } catch (InterruptedException e) {
                     //ignore.
@@ -75,6 +81,9 @@
                     return null;
                 }
                 try {
+                    if (IS_DEBUG_MODE) {
+                        LOGGER.info("next()| flushLSN: " + flushLSN.get() + ", readLSN: " + readLSN);
+                    }
                     flushLSN.wait();
                 } catch (InterruptedException e) {
                     //ignore