state_checkpoints_dir/2d93ffacbddcf363b960317816566552/chk-2903/1e95606a-8f70-4876-ad6f-95e5cc38af86 state_checkpoints_dir/2d93ffacbddcf363b960317816566552/chk-2903/2a012214-734a-4c2b-804b-d96f4f3dddf8 state_checkpoints_dir/2d93ffacbddcf363b960317816566552/chk-2903/31871f64-7034-4323-9a2e-5e387e61b7c4 state_checkpoints_dir/2d93ffacbddcf363b960317816566552/chk-2903/54c12a36-c121-4fa0-be76-7996946b4beb state_checkpoints_dir/2d93ffacbddcf363b960317816566552/chk-2903/63a22932-4bce-4531-bc65-a74d403efb91 state_checkpoints_dir/2d93ffacbddcf363b960317816566552/chk-2903/64b10d96-8333-4a7e-87d1-8afe24c7d2df state_checkpoints_dir/2d93ffacbddcf363b960317816566552/chk-2903/66290710-e619-4ccf-90b6-5f09f89354f8 state_checkpoints_dir/2d93ffacbddcf363b960317816566552/chk-2903/_metadata
QA1： chk文件下面的文件个数是跟operator个数并行度有关系吗？我只了解到_metadata文件是用来恢复状态的，那么其他文件代表的是什么意思呢？ QA2: 可以将这些文件合并到_metadata文件里吗？
