Clean up exception handling during export

Try to ensure we don't swallow errors here, and it correctly fails on a timeout.

src/main/java/com/thoughtworks/go/dbsync/DbSync.java

@@ -42,7 +42,6 @@
 import java.sql.SQLException;
 import java.sql.Statement;
 import java.util.*;
-import java.util.concurrent.Executors;
 import java.util.concurrent.ThreadPoolExecutor;
 import java.util.concurrent.TimeUnit;
 import java.util.zip.GZIPOutputStream;
@@ -58,13 +57,13 @@ public class DbSync {
     static {
         System.setProperty("org.jooq.no-logo", "true");
     }
-
     static final Logger LOG = LoggerFactory.getLogger(DbSync.class);
+    private static final long EXPORT_TIMEOUT_SECONDS = TimeUnit.MINUTES.toSeconds(90);
+
     private final Args args;
 
     public DbSync(Args args) {
         this.args = args;
-        Executors.newFixedThreadPool(1);
     }
 
     public void export() throws Exception {
@@ -95,7 +94,7 @@ public void export() throws Exception {
 
             if (!tables.isEmpty()) {
                 LOG.error("Specified target DB is not empty. Contains '{}' tables in public schema.", String.join(", ", tables.keySet()));
-                LOG.error("Skipping migration.", String.join(", ", tables.keySet()));
+                LOG.error("Skipping migration.");
                 System.exit(1);
             }
         }));
@@ -116,14 +115,12 @@ public void export() throws Exception {
                     LOG.info("Done initializing database views.");
                 });
 
-
                 withDataSource(targetDataSource, (targetConnection) -> {
                     LOG.info("Copying database records.");
                     doExport(sourceDataSource, targetDataSource, writer);
                     LOG.info("Done copying database records.");
                 });
 
-
                 withDataSource(targetDataSource, (targetConnection) -> {
                     LOG.info("Setting sequences for all tables.");
                     resetSequences(targetDataSource, tables.keySet(), writer);
@@ -194,27 +191,33 @@ private void doExport(BasicDataSource sourceDataSource, DataSource targetDataSou
             LOG.info("  {}: {} records", tableName, recordCount);
         });
 
+        LOG.info("Waiting for record copy to complete...");
         try (ProgressBar progressBar = progressBar(tables)) {
-            ThreadPoolExecutor executor = new ThreadPoolExecutor(args.threads, args.threads, 1L, TimeUnit.SECONDS, new LinkedQueue<>(2));
+            ThreadPoolExecutor executor = new ThreadPoolExecutor(args.threads, args.threads, 5L, TimeUnit.SECONDS, new LinkedQueue<>(2));
             try {
-                tables.forEach((String tableName, Integer rowCount) -> {
-                    executor.execute(() -> {
-                        try (Connection sourceConnection = sourceDataSource.getConnection()) {
-                            dumpTableSQL(tableName, rowCount, sourceConnection, targetDataSource, writer, progressBar);
-                        } catch (Exception e) {
-                            LOG.error(null, e);
-                            throw new RuntimeException(e);
-                        }
-                    });
-                });
-            } finally {
+                tables.forEach((String tableName, Integer rowCount) -> executor.execute(() -> {
+                    try (Connection sourceConnection = sourceDataSource.getConnection()) {
+                        dumpTableSQL(tableName, rowCount, sourceConnection, targetDataSource, writer, progressBar);
+                    } catch (Exception e) {
+                        LOG.error(null, e);
+                        throw new RuntimeException(e);
+                    }
+                }));
                 LOG.debug("Shutting down thread pool executor");
                 executor.shutdown();
-                LOG.debug("Awaiting termination of executorService");
-                try {
-                    executor.awaitTermination(1000, TimeUnit.SECONDS);
-                } catch (InterruptedException e) {
-                    throw new RuntimeException(e);
+                if (!executor.awaitTermination(EXPORT_TIMEOUT_SECONDS, TimeUnit.SECONDS)) {
+                    throw new InterruptedException(String.format("Timed out after [%s] seconds waiting for DB migration to complete", EXPORT_TIMEOUT_SECONDS));
+                }
+            } catch (RuntimeException e) {
+                LOG.error(null, e);
+                throw e;
+            } catch (Exception e) {
+                LOG.error(null, e);
+                throw new RuntimeException(e);
+            } finally {
+                if (!executor.isShutdown()) {
+                    LOG.warn("Forcing shutting down copy tasks...");
+                    executor.shutdownNow();
                 }
             }
         }
@@ -346,9 +349,10 @@ private void dumpTableSQL(String table, Integer rowCount, Connection sourceConne
                 break;
             }
 
-            Field<?>[] fields = records.fields();
+            @SuppressWarnings("unchecked")
+            Field<Long>[] fields = (Field<Long>[]) records.fields();
 
-            Field<Long> idFieldInCurrentSourceTable = (Field<Long>) Arrays.stream(fields)
+            Field<Long> idFieldInCurrentSourceTable = Arrays.stream(fields)
                     .filter(field -> field.getName().equalsIgnoreCase("id"))
                     .findFirst()
                     .orElseThrow(() -> new RuntimeException("Unable to determine "));