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Finally I get the answer . while interacting with Kudu ,kudu client has a default config----"Mutation Buffer Space " which is 1000.this config control the size of one flush of kudu。 At ordinary times,the pipeline runs smoothly,But when DBA operate the databases Manully,delete many rows accordingly to some conditions once. If the number of deleted rows exceed the config of "Mutation Buffer Space " .then the above issue occurs.