data_pump/readers.md

+### 输入插件readers
+|输入插件|说明|
+|----|----|
+|[file](data_pump/readers/file)|文件输入|
+|[sql](data_pump/readers/sql)|数据库输入|
+|[kafka](data_pump/readers/kafka)|kafka输入|
+|[mongodb](data_pump/readers/mongodb)|MongoDB输入|
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