Yun Gao created FLINK-19701:
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Summary: Unaligned Checkpoint might misuse the number of buffers
to persist from the previous barrier
Key: FLINK-19701
URL: https://issues.apache.org/jira/browse/FLINK-19701
Project: Flink
Issue Type: Bug
Components: Runtime / Checkpointing
Affects Versions: 1.12.0
Reporter: Yun Gao
Current CheckpointUnaligner interacts with RemoteInputChannel to persisting the
input buffers. However, based the current implementation it seems if we have
the following case:
{code:java}
1. There are 3 input channels.
2. Input channel 0 received barrier 1, and processed barrier 1 to start
checkpoint 1.
3. Input channel 1 received barrier 1, and processed barrier 1. Now the state
of input channel persister becomes BARRIER_RECEIVED and
numBuffersOvertaken(channel 1) = n_1.
4. However, input 2 received nothing and the checkpoint expired, new checkpoint
is trigger.
5. Input channel 0 received barrier 2, checkpoint 1 is deserted and checkpoint
2 is started. However, in this case the state of the input channels are not
cleared. Thus now channel 1 is still BARRIER_RECEIVED and
numBuffersOvertaken(channel 1) = n_1. Then channel 1 would only persist n_1
buffers in the channel.
{code}
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