This ERROR messages is informing you that the configured buffer in your putKafka processor was not large enough to accommodate the batch of files it wanted to transfer to Kafka. So the log above shows that a batch of 3 files was created, 2 of the files from that batch transferred successfully, and 1 file was routed to the putKafka's failure relationship. The total size of the batch was recorded as 4294967296 (4GB). These are very large files for Kafka... The Failure relationship should be looped back on to the putKafka processor so after a short penalization, the failed file will get re-transmitted. There are 4 settings at play here in the putKafka processor you will want to play around with.
Max Buffer Size: <-- max amount of reserved buffer space
Max Record Size: <-- max size of any one record
Batch Size: <-- max number of records to batch
Queue Buffering Max Time: <--- max amount of time spent on batching before transmitting.
*** The batch will be transmitted when either the Batch Size is satisfied or Queue Buffering Max time is reached.
Considering the size of the messages you are trying to send to your Kafka topic, I would recommend the following settings:
Max Buffer Size: 2 GB
Max Record Size: 2 GB
Batch Size: 1
Queue Buffering Max Time: 100 ms
Since you will be sending one file at a time, you may want to increase the number of Concurrent Tasks configured on the "Scheduling" tab of the putKafka processor. Only do this if the processor can not keep up with the flow of data. So start with the default of 1 and increase by only 1 at a time if needed. Keep in mind that the buffered records live in your JVM heap, so the the more concurrent tasks and the larger the Max Buffer Size configuration, the more heap this processor will use.
Thanks,
Matt
