adoroszlai opened a new pull request, #5766:
URL: https://github.com/apache/ozone/pull/5766
## What changes were proposed in this pull request?
`hadoop fs -checksum` (or `hdfs dfs -checksum`) fails with
`NoClassDefFoundError: CompositeCrcFileChecksum` when using Hadoop 2.
`CompositeCrcFileChecksum` was added by HDFS-13056 only in Hadoop 3.2.0 (and
backported to 3.1.1). (Thus it may also fail with Hadoop 3.1.0 and Hadoop
3.0.x, but I haven't tried those.)
This PR fixes it by:
* moving all related code into a new `CompositeCrc` class
* guarding `CompositeCrc` usage by
`HadoopCompatibility#isCompositeCrcAvailable()`
`HadoopCompatibility` is intended to be used for other version-dependent
code we may find, too.
https://issues.apache.org/jira/browse/HDDS-9886
## How was this patch tested?
Added execution of `hdfs dfs -checksum` in Robot tests.
Added execution of `TestOmKeyInfo` unit test in `ozone-filesystem-hadoop2`
module.
CI:
https://github.com/adoroszlai/ozone/actions/runs/7168203572
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