Omkar Aradhya K S created HADOOP-14407:
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Summary: DistCp - Introduce a configurable copy buffer size
Key: HADOOP-14407
URL: https://issues.apache.org/jira/browse/HADOOP-14407
Project: Hadoop Common
Issue Type: Improvement
Components: tools/distcp
Affects Versions: 0.21.0
Reporter: Omkar Aradhya K S
Assignee: Yongjun Zhang
Fix For: 2.9.0, 3.0.0-alpha3
The minimum unit of work for a distcp task is a file. We have files that are
greater than 1 TB with a block size of 1 GB. If we use distcp to copy these
files, the tasks either take a long long long time or finally fails. A better
way for distcp would be to copy all the source blocks in parallel, and then
stich the blocks back to files at the destination via the HDFS Concat API
(HDFS-222)
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