apache kafka - why delete the checkpoint file after finish loading its stored offsets? -

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in kafka 0.10.2.0,when finished init processorstatemanager,why delete checkpoint file:

// load checkpoint information offsetcheckpoint checkpoint = new offsetcheckpoint(new file(this.basedir, checkpoint_file_name)); this.checkpointedoffsets = new hashmap<>(checkpoint.read());  // delete checkpoint file after finish loading stored offsets checkpoint.delete();

if kill application forcefully, , restart it, not load checkpoint file because deleted, when restoring partition's state:

if (checkpointedoffsets.containskey(storepartition)) {     restoreconsumer.seek(storepartition, checkpointedoffsets.get(storepartition)); } else {     restoreconsumer.seektobeginning(singleton(storepartition)); }

as execute seektobeginning, consumer consume offset 0.

i find answer:

kafka-4317

patch





wiki

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