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From 翟玉勇 (JIRA) <j...@apache.org>
Subject [jira] [Created] (FLUME-3266) the parameters of fsyncPerTransaction are not working
Date Thu, 09 Aug 2018 09:38:00 GMT
翟玉勇 created FLUME-3266:
--------------------------

             Summary: the parameters of fsyncPerTransaction are not working 
                 Key: FLUME-3266
                 URL: https://issues.apache.org/jira/browse/FLUME-3266
             Project: Flume
          Issue Type: Bug
          Components: File Channel
    Affects Versions: 1.8.0
            Reporter: 翟玉勇


every take or put transaction has sync disk?
```java
this.fsyncPerTransaction = fsyncPerTransaction;
      this.fsyncInterval = fsyncInterval;
      if (!fsyncPerTransaction) {
        LOG.info("Sync interval = " + fsyncInterval);
        syncExecutor = Executors.newSingleThreadScheduledExecutor();
        syncExecutor.scheduleWithFixedDelay(new Runnable() {
          @Override
          public void run() {
            try {
              sync("Thread-other");
            } catch (Throwable ex) {
              LOG.error("Data file, " + getFile().toString() + " could not " +
                  "be synced to disk due to an error.", ex);
            }
          }
        }, fsyncInterval, fsyncInterval, TimeUnit.SECONDS);
      } else {
        syncExecutor = null;
      }
```
```java
private void commit(long transactionID, short type) throws IOException {
    Preconditions.checkState(open, "Log is closed");
    Commit commit = new Commit(transactionID, WriteOrderOracle.next(), type);
    ByteBuffer buffer = TransactionEventRecord.toByteBuffer(commit);
    int logFileIndex = nextLogWriter(transactionID);
    long usableSpace = logFiles.get(logFileIndex).getUsableSpace();
    long requiredSpace = minimumRequiredSpace + buffer.limit();
    if (usableSpace <= requiredSpace) {
      throw new IOException("Usable space exhausted, only " + usableSpace +
          " bytes remaining, required " + requiredSpace + " bytes");
    }
    boolean error = true;
    try {
      try {
        LogFile.Writer logFileWriter = logFiles.get(logFileIndex);
        // If multiple transactions are committing at the same time,
        // this ensures that the number of actual fsyncs is small and a
        // number of them are grouped together into one.
        logFileWriter.commit(buffer);
        logFileWriter.sync();
        error = false;
      } catch (LogFileRetryableIOException e) {
        if (!open) {
          throw e;
        }
        roll(logFileIndex, buffer);
        LogFile.Writer logFileWriter = logFiles.get(logFileIndex);
        logFileWriter.commit(buffer);
        logFileWriter.sync();
        error = false;
      }
    } finally {
      if (error && open) {
        roll(logFileIndex);
      }
    }
  }
```





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