Package io.debezium.connector.mysql

Class SourceInfo

  • @NotThreadSafe
final class SourceInfo
extends BaseSourceInfo
    Information about the source of information, which includes the position in the source binary log we have previously processed.

    The source partition information describes the database whose log is being consumed. Typically, the database is identified by the host address port number of the MySQL server and the name of the database. Here's a JSON-like representation of an example database: 

     {
     "server" : "production-server"
 }

    The source offset information is included in each event and captures where the connector should restart if this event's offset is the last one recorded. The offset includes the binlog filename, the position of the first event in the binlog, the number of events to skip, and the number of rows to also skip.

    Here's a JSON-like representation of an example offset: 

     {
     "server_id": 112233,
     "ts_sec": 1465937,
     "gtid": "db58b0ae-2c10-11e6-b284-0242ac110002:199",
     "file": "mysql-bin.000003",
     "pos" = 990,
     "event" = 0,
     "row": 0,
     "snapshot": true
 }

    The "gtids" field only appears in offsets produced when GTIDs are enabled. The "snapshot" field only appears in offsets produced when the connector is in the middle of a snapshot. And finally, the "ts" field contains the seconds since Unix epoch (since Jan 1, 1970) of the MySQL event; the message envelopes also have a timestamp, but that timestamp is the milliseconds since since Jan 1, 1970.

    Each change event envelope also includes the source struct that contains MySQL information about that particular event, including a mixture the fields from the partition (which is renamed in the source to make more sense), the binlog filename and position where the event can be found, and when GTIDs are enabled the GTID of the transaction in which the event occurs. Like with the offset, the "snapshot" field only appears for events produced when the connector is in the middle of a snapshot. Note that this information is likely different than the offset information, since the connector may need to restart from either just after the most recently completed transaction or the beginning of the most recently started transaction (whichever appears later in the binlog).

    Here's a JSON-like representation of the source for the metadata for an event that corresponds to the above partition and offset: 

     {
     "name": "production-server",
     "server_id": 112233,
     "ts_sec": 1465937,
     "gtid": "db58b0ae-2c10-11e6-b284-0242ac110002:199",
     "file": "mysql-bin.000003",
     "pos" = 1081,
     "row": 0,
     "snapshot": true,
     "thread" : 1,
     "db" : "inventory",
     "table" : "products"
 }
    Author:
    Randall Hauch

    • Method Detail

      • setQuery

        public void setQuery​(String query)
        Set the original SQL query.
        Parameters:
        query - the original SQL query that generated the event.

      • getQuery

        public String getQuery()
        Returns:
        the original SQL query that generated the event. NULL if no such query is associated.

      • setBinlogPosition

        public void setBinlogPosition​(String binlogFilename,
                              long positionOfFirstEvent)
        Set the position in the MySQL binlog where we will start reading.
        Parameters:
        binlogFilename - the name of the binary log file; may not be null
        positionOfFirstEvent - the position in the binary log file to begin processing

      • setEventPosition

        public void setEventPosition​(long positionOfCurrentEvent)
        Set the position within the MySQL binary log file of the current event.
        Parameters:
        positionOfCurrentEvent - the position within the binary log file of the current event

      • setRowNumber

        public void setRowNumber​(int eventRowNumber)
        Given the row number within a binlog event and the total number of rows in that event, compute the Kafka Connect offset that is be included in the produced change event describing the row.

        This method should always be called before AbstractSourceInfo.struct().

        Parameters:
        eventRowNumber - the 0-based row number within the event for which the offset is to be produced
        See Also:
        AbstractSourceInfo.struct()

      • databaseEvent

        public void databaseEvent​(String databaseName)

      • tableEvent

        public void tableEvent​(Set<TableId> tableIds)

      • tableEvent

        public void tableEvent​(TableId tableId)

      • startGtid

        public void startGtid​(String gtid)

      • setBinlogServerId

        public void setBinlogServerId​(long serverId)
        Set the server ID as found within the MySQL binary log file.
        Parameters:
        serverId - the server ID found within the binary log file

      • setBinlogTimestampSeconds

        public void setBinlogTimestampSeconds​(long timestampInSeconds)
        Set the number of seconds since Unix epoch (January 1, 1970) as found within the MySQL binary log file. Note that the value in the binlog events is in seconds, but the library we use returns the value in milliseconds (with only second precision and therefore all fractions of a second are zero). We capture this as seconds since that is the precision that MySQL uses.
        Parameters:
        timestampInSeconds - the timestamp in seconds found within the binary log file

      • setSourceTime

        public void setSourceTime​(Instant timestamp)

      • setBinlogThread

        public void setBinlogThread​(long threadId)
        Set the identifier of the MySQL thread that generated the most recent event.
        Parameters:
        threadId - the thread identifier; may be negative if not known

      • binlogFilename

        public String binlogFilename()
        Get the name of the MySQL binary log file that has last been processed.
        Returns:
        the name of the binary log file; null if it has not been set

      • binlogPosition

        public long binlogPosition()
        Get the position within the MySQL binary log file of the next event to be processed.
        Returns:
        the position within the binary log file; null if it has not been set

      • getServerId

        long getServerId()

      • getThreadId

        long getThreadId()

      • table

        String table()
        Returns a string representation of the table(s) affected by the current event. Will only represent more than a single table for events in the user-facing schema history topic for certain types of DDL. Will be null for DDL events not applying to tables (CREATE DATABASE etc.).

      • getCurrentGtid

        String getCurrentGtid()

      • getCurrentBinlogFilename

        String getCurrentBinlogFilename()

      • getCurrentBinlogPosition

        long getCurrentBinlogPosition()

      • getBinlogTimestampSeconds

        long getBinlogTimestampSeconds()

      • getCurrentRowNumber

        int getCurrentRowNumber()

      • createDocumentFromOffset

        public static Document createDocumentFromOffset​(Map<String,​?> offset)
        Create a Document from the given offset.
        Parameters:
        offset - the offset to create the document from.
        Returns:
        a Document with the offset data.

      • isLastSnapshot

        @Deprecated
public boolean isLastSnapshot()
        Deprecated.