# JDBC sink connector stops consuming from partition

**URL:** <https://forum.confluent.io/t/jdbc-sink-connector-stops-consuming-from-partition/1873>\
**Category:** Kafka Connect\
**Created:** [25 May 2021 16:46 UTC](https://forum.confluent.io/t/jdbc-sink-connector-stops-consuming-from-partition/1873 "2021-05-25T16:46:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rostov](https://avatars.discourse-cdn.com/v4/letter/r/7bcc69/32.png) [@rostov](https://forum.confluent.io/u/rostov)\
**Post date:** [25 May 2021 16:46 UTC](https://forum.confluent.io/t/jdbc-sink-connector-stops-consuming-from-partition/1873/1 "2021-05-25T16:46:07Z")

</div>

Hello everyone, I have an issue with distributed JDBC connector stop consuming from some partitions under heavy load.

The load is about 6K per second. Value type is Protobuf, key type is string. I have 6 topic partition and 6 tasks configured. I am able to do stack dump on stuck process and consistently see the same stack trace pattern for stuck threads. I can see in the connect logs the task misses heartbeat in 10 minutes since its last committed offset and tasks start to re-balance between 3 boxes.

Below are parts of connector config and stack trace. Any help is greatly appreciated!

“tasks.max”: “6”,  
“batch.size”: “500”,  
“key.converter”: “org.apache.kafka.connect.storage.StringConverter”,  
“value.converter”:“io.confluent.connect.protobuf.ProtobufConverter”,

```
at org.apache.kafka.connect.data.Values$Parser.isNext(Values.java:1251)
at org.apache.kafka.connect.data.Values$Parser.canConsume(Values.java:1233)
at org.apache.kafka.connect.data.Values$Parser.canConsume(Values.java:1229)
at org.apache.kafka.connect.data.Values.canParseSingleTokenLiteral(Values.java:751)
at org.apache.kafka.connect.data.Values.parse(Values.java:791)
at org.apache.kafka.connect.data.Values.parseString(Values.java:391)
at org.apache.kafka.connect.storage.SimpleHeaderConverter.toConnectHeader(SimpleHeaderConverter.java:64)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.convertHeadersFor(WorkerSinkTask.java:516)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.lambda$convertAndTransformRecord$3(WorkerSinkTask.java:491)
        at org.apache.kafka.connect.runtime.WorkerSinkTask$$Lambda$581/0x0000000800627040.call(Unknown Source)
        at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndRetry(RetryWithToleranceOperator.java:128)
        at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execAndHandleError(RetryWithToleranceOperator.java:162)
        at org.apache.kafka.connect.runtime.errors.RetryWithToleranceOperator.execute(RetryWithToleranceOperator.java:104)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.convertAndTransformRecord(WorkerSinkTask.java:491)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.convertMessages(WorkerSinkTask.java:465)
        at org.apache.kafka.connect.runtime.WorkerSinkTask.poll(WorkerSinkTask.java:321)

```

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex019/uploads/confluentcommunity/original/1X/c49438c90c9df282e9996fdf6971be890c71b65a.svg) [@system](https://forum.confluent.io/u/system)\
**Post date:** [24 June 2021 16:46 UTC](https://forum.confluent.io/t/jdbc-sink-connector-stops-consuming-from-partition/1873/2 "2021-06-24T16:46:10Z")

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