Yingjie Cao created FLINK-28561: ----------------------------------- Summary: Merge subpartition shuffle data read request for better sequential IO Key: FLINK-28561 URL: https://issues.apache.org/jira/browse/FLINK-28561 Project: Flink Issue Type: Improvement Components: Runtime / Network Reporter: Yingjie Cao Fix For: 1.17.0
Currently, the shuffle data of each subpartition for blocking shuffle is read separately. To achieve better performance and reduce IOPS, we can merge consecutive data requests of the same field together and serves them in one IO request. More specifically, 1) if multiple data requests are reading the same data, for example, reading broadcast data, the reader will read the data only once and send the same piece of data to multiple downstream consumers. 2) if multiple data requests are reading the consecutive data in one file, we will merge those data requests together as one large request and read a larger size of data sequentially which is good for file IO performance. -- This message was sent by Atlassian Jira (v8.20.10#820010)