Examples of com.sleepycat.je.log.entry.NameLNLogEntry

com.sleepycat.je.log.entry.NameLNLogEntry
NameLNLogEntry contains all the regular LNLogEntry fields and additional information about the database operation which instigated the logging of this NameLN. This additional information is used to support replication of database operations in a replication group. Database operations pose a special problem for replication because unlike data record put and get calls, they can result in multiple log entries that are not all members of a single transaction. Create and truncate are the problem operations because they end up logging new MapLNs, and our implementation does not treat MapLNs as transactional. Database operations challenge two replication assumptions: (a) that all logical operations can be repeated on the client node based on the contents of a single log entry, and (b) that non-txnal log entries like MapLNs need not be replicated. Specifically, here's what is logged for database operations. create: 1. new NameLN_TX 2. new MapLN, which has the database config info. 3. txn commit of autocommit or user txn. rename: 1. deleted NameLN_TX 2. new NameLN_TX 3. txn commit from autocommit or user txn truncate: 1. new MapLN w/new id 2. modify the existing NameLN with new id (old database is deleted by usual commit-time processing) 3. txn commit from autocommit or user txn delete 1. deleted NameLN_TX (old database gets deleted by usual commit-time processing) 2. txn commit from autocommit or user txn Extra information is needed for create and truncate, which both log information within the MapLN. Rename and delete only log NameLNs, so they can be replicated on the client using the normal replication messages. The extra fields which follow the usual LNLogEntry fields are: operationType - the type of database operation. In a single node system, this is local information implicit in the code path. databaseConfig (optional) - For creates, database configuration info databaseId (optional)- For truncates, the old db id, so we know which MapLN to delete.

                              long logAbortLsn,
                              boolean logAbortKnownDeleted,
                              Txn logTxn,
                              ReplicationContext repContext) {


        return new NameLNLogEntry(entryType,
                                  this,
                                  dbImpl.getId(),
                                  key,
                                  logAbortLsn,
                                  logAbortKnownDeleted,

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        /* For now, we assume all replay entries have a txn id. */
        repImpl.getTxnManager().updateFromReplay(logEntry.getTransactionId());


        /* If it's a database operation, update the database id. */
        if (logEntry instanceof NameLNLogEntry) {
            NameLNLogEntry nameLogEntry = (NameLNLogEntry) logEntry;
            nameLogEntry.postFetchInit(false /*isDupDb*/);
            NameLN nameLN = (NameLN) nameLogEntry.getLN();
            repImpl.getDbTree().updateFromReplay(nameLN.getId());
        }
    }

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     */
    private void applyNameLN(ReplayTxn repTxn,
                             InputWireRecord wireRecord)
        throws DatabaseException {


        NameLNLogEntry nameLNEntry = (NameLNLogEntry) wireRecord.getLogEntry();
        final NameLN nameLN = (NameLN) nameLNEntry.getLN();


        String databaseName;
        try {
            databaseName = new String(nameLNEntry.getKey(), "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw EnvironmentFailureException.unexpectedException(e);
        }


        final DbOpReplicationContext repContext =

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                              long logAbortLsn,
                              boolean logAbortKnownDeleted,
                              Txn logTxn,
                              ReplicationContext repContext) {


        return new NameLNLogEntry(entryType,
                                  this,
                                  dbImpl.getId(),
                                  key,
                                  logAbortLsn,
                                  logAbortKnownDeleted,

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     */
    private void applyNameLN(ReplayTxn repTxn,
                             InputWireRecord wireRecord)
        throws DatabaseException {


        NameLNLogEntry nameLNEntry = (NameLNLogEntry) wireRecord.getLogEntry();
        final NameLN nameLN = (NameLN) nameLNEntry.getLN();


        String databaseName;
        try {
            databaseName = new String(nameLNEntry.getKey(), "UTF-8");
        } catch (UnsupportedEncodingException e) {
            throw EnvironmentFailureException.unexpectedException(e);
        }


        final DbOpReplicationContext repContext =

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Related Classes of com.sleepycat.je.log.entry.NameLNLogEntry

com.sleepycat.je.dbi.DatabaseId

com.sleepycat.je.dbi.ReplicatedDatabaseConfig

com.sleepycat.je.log.ReplicationContext

com.sleepycat.je.rep.impl.node.Replay

com.sleepycat.je.tree.NameLN

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