pulsar-io/hdfs2/src/main/java/org/apache/pulsar/io/hdfs2/sink/HdfsSyncThread.java [34:77]:
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public class HdfsSyncThread<V> extends Thread {

    private final Syncable stream;
    private final BlockingQueue<Record<V>> unackedRecords;
    private final long syncInterval;
    private boolean keepRunning = true;

    public HdfsSyncThread(Syncable stream, BlockingQueue<Record<V>> unackedRecords, long syncInterval) {
      this.stream = stream;
      this.unackedRecords = unackedRecords;
      this.syncInterval = syncInterval;
    }

    @Override
    public void run() {
       while (keepRunning) {
         try {
            Thread.sleep(syncInterval);
            ackRecords();
         } catch (InterruptedException e) {
            return;
         } catch (IOException e) {
            e.printStackTrace();
         }
       }
    }

    public final void halt() throws IOException, InterruptedException {
       keepRunning = false;
       ackRecords();
    }

    private void ackRecords() throws IOException, InterruptedException {

        if (CollectionUtils.isEmpty(unackedRecords)) {
           return;
        }

        synchronized (stream) {
          stream.hsync();
        }

        while (!unackedRecords.isEmpty()) {
          unackedRecords.take().ack();
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pulsar-io/hdfs3/src/main/java/org/apache/pulsar/io/hdfs3/sink/HdfsSyncThread.java [34:77]:
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public class HdfsSyncThread<V> extends Thread {

    private final Syncable stream;
    private final BlockingQueue<Record<V>> unackedRecords;
    private final long syncInterval;
    private boolean keepRunning = true;

    public HdfsSyncThread(Syncable stream, BlockingQueue<Record<V>> unackedRecords, long syncInterval) {
      this.stream = stream;
      this.unackedRecords = unackedRecords;
      this.syncInterval = syncInterval;
    }

    @Override
    public void run() {
       while (keepRunning) {
         try {
            Thread.sleep(syncInterval);
            ackRecords();
         } catch (InterruptedException e) {
            return;
         } catch (IOException e) {
            e.printStackTrace();
         }
       }
    }

    public final void halt() throws IOException, InterruptedException {
       keepRunning = false;
       ackRecords();
    }

    private void ackRecords() throws IOException, InterruptedException {

        if (CollectionUtils.isEmpty(unackedRecords)) {
           return;
        }

        synchronized (stream) {
          stream.hsync();
        }

        while (!unackedRecords.isEmpty()) {
          unackedRecords.take().ack();
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