Rajesh Balamohan created HADOOP-13163:
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Summary: Reuse pre-computed filestatus in Distcp-CopyMapper
Key: HADOOP-13163
URL: https://issues.apache.org/jira/browse/HADOOP-13163
Project: Hadoop Common
Issue Type: Bug
Reporter: Rajesh Balamohan
https://github.com/apache/hadoop/blob/af942585a108d70e0946f6dd4c465a54d068eabf/hadoop-tools/hadoop-distcp/src/main/java/org/apache/hadoop/tools/mapred/CopyMapper.java#L185
targetStatus is already computed and it can be reused in checkUpdate()
function. This wouldn't be a major issue in NN/HDFS, but in the case of S3
getFileStatus calls can be expensive.
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