Examples of org.apache.zookeeper_voltpatches.server.persistence.FileTxnLog

org.apache.zookeeper_voltpatches.server.persistence.FileTxnLog

This class implements the TxnLog interface. It provides api's to access the txnlogs and add entries to it.

The format of a Transactional log is as follows:

 LogFile: FileHeader TxnList ZeroPad FileHeader: { magic 4bytes (ZKLG) version 4bytes dbid 8bytes } TxnList: Txn || Txn TxnList Txn: checksum Txnlen TxnHeader Record 0x42 checksum: 8bytes Adler32 is currently used calculated across payload -- Txnlen, TxnHeader, Record and 0x42 Txnlen: len 4bytes TxnHeader: { sessionid 8bytes cxid 4bytes zxid 8bytes time 8bytes type 4bytes } Record: See Jute definition file for details on the various record types ZeroPad: 0 padded to EOF (filled during preallocation stage)


        // if a log file is more recent we must scan it to find
        // the highest zxid
        long zxid = maxLog;
        try {
            FileTxnLog txn = new FileTxnLog(logDir);
            TxnIterator itr = txn.read(maxLog);
            while (true) {
                if(!itr.next())
                    break;
                TxnHeader hdr = itr.getHeader();
                zxid = hdr.getZxid();

Examples of org.apache.zookeeper_voltpatches.server.persistence.FileTxnLog

Related Classes of org.apache.zookeeper_voltpatches.server.persistence.FileTxnLog