为什么在完成加载存储的偏移后删除检查点文件？

Question

在kafka 0.10.2.0中，当完成初始化ProcessorStateManager时，为什么要删除检查点文件：

// load the checkpoint information
OffsetCheckpoint checkpoint = new OffsetCheckpoint(new File(this.baseDir, CHECKPOINT_FILE_NAME));
this.checkpointedOffsets = new HashMap<>(checkpoint.read());

// delete the checkpoint file after finish loading its stored offsets
checkpoint.delete();

如果然后我强行终止应用程序并重新启动它，它将不会加载检查点文件，因为它已被删除，因此在恢复分区的状态时：

if (checkpointedOffsets.containsKey(storePartition)) {
    restoreConsumer.seek(storePartition, checkpointedOffsets.get(storePartition));
} else {
    restoreConsumer.seekToBeginning(singleton(storePartition));
}

因为它将执行seekToBeginning，然后消费者将从偏移0消耗。

Answer 1

我找到答案：

KAFKA-4317

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