Examples of org.apache.hadoop.hdfs.util.BestEffortLongFile

org.apache.hadoop.hdfs.util.BestEffortLongFile
Class that represents a file on disk which stores a single long value, but does not make any effort to make it truly durable. This is in contrast to {@link PersistentLongFile} which fsync()s the value on everychange. This should be used for values which are updated frequently (such that performance is important) and not required to be up-to-date for correctness. This class also differs in that it stores the value as binary data instead of a textual string.

    File currentDir = storage.getSingularStorageDir().getCurrentDir();
    this.lastPromisedEpoch = new PersistentLongFile(
        new File(currentDir, LAST_PROMISED_FILENAME), 0);
    this.lastWriterEpoch = new PersistentLongFile(
        new File(currentDir, LAST_WRITER_EPOCH), 0);
    this.committedTxnId = new BestEffortLongFile(
        new File(currentDir, COMMITTED_TXID_FILENAME),
        HdfsConstants.INVALID_TXID);
  }

View Full Code Here

    File currentDir = storage.getSingularStorageDir().getCurrentDir();
    this.lastPromisedEpoch = new PersistentLongFile(
        new File(currentDir, LAST_PROMISED_FILENAME), 0);
    this.lastWriterEpoch = new PersistentLongFile(
        new File(currentDir, LAST_WRITER_EPOCH), 0);
    this.committedTxnId = new BestEffortLongFile(
        new File(currentDir, COMMITTED_TXID_FILENAME),
        HdfsConstants.INVALID_TXID);
  }

View Full Code Here

    File currentDir = storage.getSingularStorageDir().getCurrentDir();
    this.lastPromisedEpoch = new PersistentLongFile(
        new File(currentDir, LAST_PROMISED_FILENAME), 0);
    this.lastWriterEpoch = new PersistentLongFile(
        new File(currentDir, LAST_WRITER_EPOCH), 0);
    this.committedTxnId = new BestEffortLongFile(
        new File(currentDir, COMMITTED_TXID_FILENAME),
        HdfsConstants.INVALID_TXID);
  }

View Full Code Here

    File currentDir = storage.getSingularStorageDir().getCurrentDir();
    this.lastPromisedEpoch = new PersistentLongFile(
        new File(currentDir, LAST_PROMISED_FILENAME), 0);
    this.lastWriterEpoch = new PersistentLongFile(
        new File(currentDir, LAST_WRITER_EPOCH), 0);
    this.committedTxnId = new BestEffortLongFile(
        new File(currentDir, COMMITTED_TXID_FILENAME),
        HdfsConstants.INVALID_TXID);
  }

View Full Code Here

    File currentDir = storage.getSingularStorageDir().getCurrentDir();
    this.lastPromisedEpoch = new PersistentLongFile(
        new File(currentDir, LAST_PROMISED_FILENAME), 0);
    this.lastWriterEpoch = new PersistentLongFile(
        new File(currentDir, LAST_WRITER_EPOCH), 0);
    this.committedTxnId = new BestEffortLongFile(
        new File(currentDir, COMMITTED_TXID_FILENAME),
        HdfsConstants.INVALID_TXID);
  }

View Full Code Here

    File currentDir = storage.getSingularStorageDir().getCurrentDir();
    this.lastPromisedEpoch = new PersistentLongFile(
        new File(currentDir, LAST_PROMISED_FILENAME), 0);
    this.lastWriterEpoch = new PersistentLongFile(
        new File(currentDir, LAST_WRITER_EPOCH), 0);
    this.committedTxnId = new BestEffortLongFile(
        new File(currentDir, COMMITTED_TXID_FILENAME),
        HdfsConstants.INVALID_TXID);
  }

View Full Code Here

    File currentDir = journalStorage.getSingularStorageDir().getCurrentDir();
    this.lastPromisedEpoch = new PersistentLongFile(
        new File(currentDir, LAST_PROMISED_FILENAME), 0);
    this.lastWriterEpoch = new PersistentLongFile(
        new File(currentDir, LAST_WRITER_EPOCH), 0);
    this.committedTxnId = new BestEffortLongFile(
        new File(currentDir, COMMITTED_TXID_FILENAME),
        HdfsConstants.INVALID_TXID);
    metrics.lastWriterEpoch.set(lastWriterEpoch.get());
  }

View Full Code Here

TOP

Related Classes of org.apache.hadoop.hdfs.util.BestEffortLongFile

org.apache.hadoop.hdfs.qjournal.server.Journal

java.io.IOException

java.io.RandomAccessFile

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.