ko byoung kwon created KAFKA-6860:
-------------------------------------
Summary: missing creating checkpoint when reinitializeStateStores
with eosEnabled(true)
Key: KAFKA-6860
URL: https://issues.apache.org/jira/browse/KAFKA-6860
Project: Kafka
Issue Type: Bug
Components: streams
Affects Versions: 1.1.0
Environment: mac, kafka1.1
Reporter: ko byoung kwon
First of all, please understand that my English is not fluent.
*Symptom*
With EOS enabled , Reinitializing stateStores get an NPE because checkpoint is
null.
{code:java}
2018-05-02 18:05:17.156 ERROR 60836 --- [-StreamThread-1]
o.a.k.s.p.internals.StreamThread : stream-thread
[kafka-stream-application-d6ec1dfb-9b7f-42dd-8b28-899ff3d1ad98-StreamThread-1]
Encountered the following error during processing:
java.lang.NullPointerException: null
at
org.apache.kafka.streams.processor.internals.AbstractStateManager.reinitializeStateStoresForPartitions(AbstractStateManager.java:66)
~[kafka-streams-1.1.0.jar:na]
at
org.apache.kafka.streams.processor.internals.ProcessorStateManager.reinitializeStateStoresForPartitions(ProcessorStateManager.java:155)
~[kafka-streams-1.1.0.jar:na]
at
org.apache.kafka.streams.processor.internals.AbstractTask.reinitializeStateStoresForPartitions(AbstractTask.java:230)
~[kafka-streams-1.1.0.jar:na]
at
org.apache.kafka.streams.processor.internals.StoreChangelogReader.restore(StoreChangelogReader.java:94)
~[kafka-streams-1.1.0.jar:na]
{code}
*How to reproduce*
*configure as*
- changelog topic with short `retention.ms` and `delete` policy
ex) retention.ms=30000,cleanup.policy=delete
- exaclty once semantic enabled
- no cleanup
*Step*
- two task[0_0],[0,1] , two Spring Boot (assign was#1:task[0_0],
was#2:task[0_1])
- write some data each state store(changelog topic will soon erase those
messages. by short "retentin.ms")
- when was#2 killed, then was#1 will restore task[0_1]'s data on it's own
rocksDB
- In the process, it finds a checkpoint and an error
occurs.(AbstractStateManager #66)
{code:java}
// My code
Map<String, String> topicConfiguration = new HashMap<>();
topicConfiguration.putIfAbsent("cleanup.policy", "delete");
topicConfiguration.putIfAbsent("file.delete.delay.ms", "0");
topicConfiguration.putIfAbsent("retention.ms", "3000");
builder.stream(properties.getSourceTopic(),
Consumed.with(Serdes.Long(), Serdes.String()))
.groupByKey()
.count(Materialized
.<Long, Long, KeyValueStore<Bytes,
byte[]>>as(ORDER_STORE_NAME)
.withKeySerde(Serdes.Long())
.withValueSerde(Serdes.Long())
.withLoggingEnabled(topicConfiguration));
{code}
*Suggestion*
When EOS is enabled, the checkpoint will be null.
I think , need to add some code to create a Checkpoint.
As follows
{code:java}
// # At org.apache.kafka.streams.processor.internals.AbstractStateManager #66
// # from
if (checkpoint == null) {
checkpoint = new OffsetCheckpoint(new File(baseDir, CHECKPOINT_FILE_NAME));
}
// # to
try {
checkpoint.write(checkpointableOffsets);
} catch (final IOException fatalException) {
log.error("Failed to write offset checkpoint file to {} while
re-initializing {}: {}", checkpoint, stateStores, fatalException);
throw new StreamsException("Failed to reinitialize global store.",
fatalException);
}
{code}
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