Steven Rand created HDFS-14352:
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Summary: backport client-side EC support to branch-2
Key: HDFS-14352
URL: https://issues.apache.org/jira/browse/HDFS-14352
Project: Hadoop HDFS
Issue Type: Improvement
Components: erasure-coding, hdfs-client
Reporter: Steven Rand
Currently, Hadoop 2.x clients can't read or write striped files from HDFS. This
affects compatibility with 3.x clusters in two ways:
* The obvious impact is that 2.x clients can't make use of the new erasure
coding in feature in Hadoop 3.
* For some use cases, clients built against Hadoop 3 won't be able to use
erasure coding either. This is because if they write a striped file, then
clients built against Hadoop 2 won't be able to read it.
This ticket proposes backporting the client-side components of HDFS-7285 to
branch-2 for improved compatibility between 2.x clients and 3.x clusters. I
believe this can be done without also backporting the changes made to the
NameNodes and the DataNodes. While many lines of code would need to be
backported, most of it is new code that can be copy/pasted from trunk, which
simplifies the process. The existing code in {{DFSClient}}, {{DFSInputStream}},
{{DFSOutputStream}}, etc. that would need to be modified is still significant,
but much smaller.
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