Example usage for org.apache.zookeeper.server.persistence FileTxnLog TXNLOG_MAGIC

Introduction

In this page you can find the example usage for org.apache.zookeeper.server.persistence FileTxnLog TXNLOG_MAGIC.

Prototype

int TXNLOG_MAGIC

To view the source code for org.apache.zookeeper.server.persistence FileTxnLog TXNLOG_MAGIC.

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Usage

From source file:com.linkedin.helix.tools.ZKLogFormatter.java

License:Apache License

private static void readTransactionLog(String logfilepath)
        throws FileNotFoundException, IOException, EOFException {
    FileInputStream fis = new FileInputStream(logfilepath);
    BinaryInputArchive logStream = BinaryInputArchive.getArchive(fis);
    FileHeader fhdr = new FileHeader();
    fhdr.deserialize(logStream, "fileheader");

    if (fhdr.getMagic() != FileTxnLog.TXNLOG_MAGIC) {
        System.err.println("Invalid magic number for " + logfilepath);
        System.exit(2);//from w w w  .j  a  v  a  2 s.c  om
    }

    if (bw != null) {
        bw.write("ZooKeeper Transactional Log File with dbid " + fhdr.getDbid() + " txnlog format version "
                + fhdr.getVersion());
        bw.newLine();
    } else {
        System.out.println("ZooKeeper Transactional Log File with dbid " + fhdr.getDbid()
                + " txnlog format version " + fhdr.getVersion());
    }

    int count = 0;
    while (true) {
        long crcValue;
        byte[] bytes;
        try {
            crcValue = logStream.readLong("crcvalue");

            bytes = logStream.readBuffer("txnEntry");
        } catch (EOFException e) {
            if (bw != null) {
                bw.write("EOF reached after " + count + " txns.");
                bw.newLine();
            } else {
                System.out.println("EOF reached after " + count + " txns.");
            }

            break;
        }
        if (bytes.length == 0) {
            // Since we preallocate, we define EOF to be an
            // empty transaction
            if (bw != null) {
                bw.write("EOF reached after " + count + " txns.");
                bw.newLine();
            } else {
                System.out.println("EOF reached after " + count + " txns.");
            }

            return;
        }
        Checksum crc = new Adler32();
        crc.update(bytes, 0, bytes.length);
        if (crcValue != crc.getValue()) {
            throw new IOException("CRC doesn't match " + crcValue + " vs " + crc.getValue());
        }
        InputArchive iab = BinaryInputArchive.getArchive(new ByteArrayInputStream(bytes));
        TxnHeader hdr = new TxnHeader();
        Record txn = SerializeUtils.deserializeTxn(iab, hdr);
        if (bw != null) {
            bw.write(formatTransaction(hdr, txn));
            bw.newLine();
        } else {
            System.out.println(formatTransaction(hdr, txn));
        }

        if (logStream.readByte("EOR") != 'B') {
            LOG.error("Last transaction was partial.");
            throw new EOFException("Last transaction was partial.");
        }
        count++;
    }
}

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From source file:com.netflix.exhibitor.core.index.ZooKeeperLogParser.java

License:Apache License

public ZooKeeperLogParser(InputStream log) {
    logStream = BinaryInputArchive.getArchive(log);

    boolean localValidHeader = false;
    try {//ww w .  j  a  v  a 2  s  . co  m
        FileHeader fhdr = new FileHeader();
        fhdr.deserialize(logStream, "fileheader");
        localValidHeader = (fhdr.getMagic() == FileTxnLog.TXNLOG_MAGIC);
    } catch (IOException e) {
        // ignore
    }
    validHeader = localValidHeader;
}

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From source file:com.zklogtool.reader.TransactionLogFileReader.java

License:Apache License

/**
 *
 * @param transactionLogFile Transaction log file.
 * @throws FileNotFoundException Thrown if file is not found.
 * @throws IOException Thrown if there is a problem with reading
 * <code>transactionLogFile</code>.
 *///from  w w  w  .jav a2s. c o m
public TransactionLogFileReader(File transactionLogFile) throws FileNotFoundException, IOException {

    this.transactionLogFile = transactionLogFile;

    raf = new RandomAccessFile(transactionLogFile, "r");
    ia = new BinaryInputArchive(raf);

    header = new FileHeader();
    header.deserialize(ia, "fileheader");

    if (header.getMagic() != TXNLOG_MAGIC) {

        throw new IOException(
                "Mismatching magic headers " + header.getMagic() + " != " + FileTxnLog.TXNLOG_MAGIC);
    }

    resetFilePointer = raf.getFilePointer();
    lastTransactionFilePointer = resetFilePointer;

}

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