[GitHub] [spark] duanmeng edited a comment on pull request #29907: [SPARK-33022] partition length is wrong after merge partition segment…

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duanmeng edited a comment on pull request #29907:
URL: https://github.com/apache/spark/pull/29907#issuecomment-705995805


   > > This is related to disk/kernel but we can avoid it in spark without any performance loss.
   > 
   > Do you have any reference regarding the kernel issue？In other words, do you have any evidence to support the issue is caused by a kernel issue?
   
   Unfortunately I don't have directly evidence since it rarely happens and the kernel is an inhouse kernel. I can only infer from the log that the file exist and its length is 1462 but read 0 bytes from it, maybe the data is still in the block layer when the file was read, so IMHO we can defend it in framework level (eg, spark) since the actual length is count after writing records and commiting.


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