Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/2707#discussion_r86106025 --- Diff: flink-streaming-connectors/flink-connector-cassandra/src/main/java/org/apache/flink/streaming/connectors/cassandra/CassandraCommitter.java --- @@ -118,16 +117,32 @@ public void close() throws Exception { } @Override - public void commitCheckpoint(long checkpointID) { - session.execute(updateStatement.bind(checkpointID)); - this.lastCommittedCheckpointID = checkpointID; + public void commitCheckpoint(int subtaskIdx, long checkpointId) { + String statement = String.format( + "UPDATE %s.%s set checkpoint_id=%d where sink_id='%s' and sub_id=%d;", + keySpace, table, checkpointId, operatorId, subtaskIdx); + + session.execute(statement); } @Override - public boolean isCheckpointCommitted(long checkpointID) { - if (this.lastCommittedCheckpointID == -1) { - this.lastCommittedCheckpointID = session.execute(selectStatement.bind()).one().getLong("checkpoint_id"); + public boolean isCheckpointCommitted(int subtaskIdx, long checkpointId) { + + // Pending checkpointed buffers are committed in ascending order of their + // checkpoint id. This way we can tell if a checkpointed buffer was committed + // just by asking the third party storage system for the last checkpointed + // checkpoint id committed by the specific subtask. + + Long lastCommittedCheckpoint = lastCommittedCheckpoints.get(subtaskIdx); + if (lastCommittedCheckpoint == null || lastCommittedCheckpoint == -1) { --- End diff -- we don't need to put -1 into the Map in case no checkpoint was committed; the map returning null serves the same purpose.
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