*/
public void ack(ClientIdentity clientIdentity, long batchId) throws CanalServerException {
checkStart(clientIdentity.getDestination());
checkSubscribe(clientIdentity);
CanalInstance canalInstance = canalInstances.get(clientIdentity.getDestination());
PositionRange<LogPosition> positionRanges = null;
positionRanges = canalInstance.getMetaManager().removeBatch(clientIdentity, batchId); // 更新位置
if (positionRanges == null) { // 说明是重复的ack/rollback
throw new CanalServerException(
String.format(
"ack error , clientId:%s batchId:%d is not exist , please check",
clientIdentity.getClientId(), batchId));
}
// 更新cursor最好严格判断下位置是否有跳跃更新
Position position = lastRollbackPostions.get(clientIdentity);
if (position != null) {
// Position position = canalInstance.getMetaManager().getCursor(clientIdentity);
LogPosition minPosition = CanalEventUtils.min(positionRanges.getStart(), (LogPosition) position);
if (minPosition == position) {// ack的position要晚于该最后ack的位置，可能有丢数据
throw new CanalServerException(
String.format(
"ack error , clientId:%s batchId:%d %s is jump ack , last ack:%s",
clientIdentity.getClientId(), batchId, positionRanges,
position));
}
}
// 更新cursor
if (positionRanges.getAck() != null) {
canalInstance.getMetaManager().updateCursor(clientIdentity, positionRanges.getAck());
logger.info("ack successfully, clientId:{} batchId:{} position:{}", new Object[] {
clientIdentity.getClientId(), batchId, positionRanges });
}
// 可定时清理数据
canalInstance.getEventStore().ack(positionRanges.getEnd());
}