Package io.debezium.connector.mysql

Class SourceInfo

java.lang.Object
io.debezium.connector.AbstractSourceInfo
io.debezium.connector.common.BaseSourceInfo
io.debezium.connector.mysql.SourceInfo
@NotThreadSafe public 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 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 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

  • Field Details

  • Constructor Details

  • Method Details

    • 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:

    • 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

    • 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()

    • getCurrentRowNumber

      int getCurrentRowNumber()

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • 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.

    • timestamp

      protected Instant timestamp()
      Specified by:
      timestamp in class AbstractSourceInfo

    • database

      protected String database()
      Specified by:
      database in class AbstractSourceInfo