Merge pull request confluentinc#45 from confluentinc/logs

added some logging. hopefully more useful than annoying while trouble…

Author: gwenshap

src/main/java/io/confluent/connect/jdbc/JdbcSourceTask.java

@@ -202,7 +202,7 @@ public List<SourceRecord> poll() throws InterruptedException {
 
       List<SourceRecord> results = new ArrayList<>();
       try {
-        log.trace("Checking for next block of results from {}", querier.toString());
+        log.debug("Checking for next block of results from {}", querier.toString());
         querier.maybeStartQuery(db);
 
         int batchMaxRows = config.getInt(JdbcSourceTaskConfig.BATCH_MAX_ROWS_CONFIG);
@@ -211,9 +211,10 @@ public List<SourceRecord> poll() throws InterruptedException {
           results.add(querier.extractRecord());
         }
 
+
         // If we finished processing the results from this query, we can clear it out
         if (!hadNext) {
-          log.trace("Closing this query for {}", querier.toString());
+          log.debug("Closing this query for {}", querier.toString());
           TableQuerier removedQuerier = tableQueue.poll();
           assert removedQuerier == querier;
           now = time.milliseconds();
@@ -226,7 +227,7 @@ public List<SourceRecord> poll() throws InterruptedException {
           continue;
         }
 
-        log.trace("Returning {} records for {}", results.size(), querier.toString());
+        log.debug("Returning {} records for {}", results.size(), querier.toString());
         return results;
       } catch (SQLException e) {
         log.error("Failed to run query for table {}: {}", querier.toString(), e);

src/main/java/io/confluent/connect/jdbc/TableMonitorThread.java

@@ -24,6 +24,7 @@
 import java.sql.Connection;
 import java.sql.SQLException;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Set;
 import java.util.concurrent.CountDownLatch;
@@ -103,6 +104,7 @@ private boolean updateTables() {
       final List<String> tables;
       try {
         tables = JdbcUtils.getTables(db);
+        log.debug("Got the following tables: " + Arrays.toString(tables.toArray()));
       } catch (SQLException e) {
         log.error("Error while trying to get updated table list, ignoring and waiting for next "
                   + "table poll interval", e);
@@ -129,6 +131,7 @@ private boolean updateTables() {
       }
 
       if (!filteredTables.equals(this.tables)) {
+        log.debug("After filtering we got tables: " + Arrays.toString(filteredTables.toArray()));
         List<String> previousTables = this.tables;
         this.tables = filteredTables;
         db.notifyAll();

src/main/java/io/confluent/connect/jdbc/TimestampIncrementingTableQuerier.java

@@ -151,11 +151,14 @@ protected ResultSet executeQuery() throws SQLException {
       stmt.setTimestamp(1, ts, UTC_CALENDAR);
       stmt.setLong(2, (incrementingOffset == null ? -1 : incrementingOffset));
       stmt.setTimestamp(3, ts, UTC_CALENDAR);
+      log.debug("Executing prepared statement with timestamp value = " + timestampOffset + " and incrementing value = " + incrementingOffset);
     } else if (incrementingColumn != null) {
       stmt.setLong(1, (incrementingOffset == null ? -1 : incrementingOffset));
+      log.debug("Executing prepared statement with incrementing value = " + incrementingOffset);
     } else if (timestampColumn != null) {
       Timestamp ts = new Timestamp(timestampOffset == null ? 0 : timestampOffset);
       stmt.setTimestamp(1, ts, UTC_CALENDAR);
+      log.debug("Executing prepared statement with timestamp value = " + timestampOffset);
     }
     return stmt.executeQuery();
   }