void dr_cb (RdKafka::Message &message) {
if (message.err()) {
state.producer.numErr++;
errorString("producer_send_error", message.errstr(),
message.topic_name(),
message.key(),
std::string(static_cast<const char*>(message.payload()),
message.len()));
} else {
successString("producer_send_success",
message.topic_name(),
(int)message.partition(),
message.offset(),
message.key(),
std::string(static_cast<const char*>(message.payload()),
message.len()));
state.producer.numAcked++;
}
}
const void* KafkaStreamedDataset::nextRow()
{
const void* result = NULL;
__int32 maxAttempts = 10; //!< Maximum number of tries if local queue is full
__int32 timeoutWait = 100; //!< Amount of time to wait between retries
__int32 attemptNum = 0;
if (maxRecords <= 0 || consumedRecCount < maxRecords)
{
RdKafka::Message* messageObjPtr = NULL;
bool messageConsumed = false;
while (!messageConsumed && shouldRead && attemptNum < maxAttempts)
{
messageObjPtr = consumerPtr->getOneMessage(); // messageObjPtr must be deleted when we are through with it
if (messageObjPtr)
{
try
{
switch (messageObjPtr->err())
{
case RdKafka::ERR_NO_ERROR:
{
RtlDynamicRowBuilder rowBuilder(resultAllocator);
unsigned len = sizeof(__int32) + sizeof(__int64) + sizeof(size32_t) + messageObjPtr->len();
byte* row = rowBuilder.ensureCapacity(len, NULL);
// Populating this structure:
// EXPORT KafkaMessage := RECORD
// UNSIGNED4 partitionNum;
// UNSIGNED8 offset;
// STRING message;
// END;
*(__int32*)(row) = messageObjPtr->partition();
*(__int64*)(row + sizeof(__int32)) = messageObjPtr->offset();
*(size32_t*)(row + sizeof(__int32) + sizeof(__int64)) = messageObjPtr->len();
memcpy(row + sizeof(__int32) + sizeof(__int64) + sizeof(size32_t), messageObjPtr->payload(), messageObjPtr->len());
result = rowBuilder.finalizeRowClear(len);
lastMsgOffset = messageObjPtr->offset();
++consumedRecCount;
// Give opportunity for consumer to pull in any additional messages
consumerPtr->handle()->poll(0);
// Mark as loaded so we don't retry
messageConsumed = true;
}
break;
case RdKafka::ERR__TIMED_OUT:
// No new messages arrived and we timed out waiting
++attemptNum;
consumerPtr->handle()->poll(timeoutWait);
break;
case RdKafka::ERR__PARTITION_EOF:
// We reached the end of the messages in the partition
if (traceLevel > 4)
{
DBGLOG("Kafka: EOF reading message from partition %d", messageObjPtr->partition());
}
shouldRead = false;
break;
case RdKafka::ERR__UNKNOWN_PARTITION:
// Unknown partition; don't throw an error here because
// in some configurations (e.g. more Thor slaves than
// partitions) not all consumers will have a partition
// to read
if (traceLevel > 4)
{
DBGLOG("Kafka: Unknown partition while trying to read");
}
shouldRead = false;
break;
case RdKafka::ERR__UNKNOWN_TOPIC:
throw MakeStringException(-1, "Kafka: Error while reading message: '%s'", messageObjPtr->errstr().c_str());
break;
}
}
catch (...)
{
delete(messageObjPtr);
throw;
}
delete(messageObjPtr);
messageObjPtr = NULL;
}
}
}
return result;
}
