steveloughran opened a new pull request, #6966:
URL: https://github.com/apache/hadoop/pull/6966
1. Configuration adds new method `getEnumSet()` to get a set of enum values
from a configuration string. <E extends Enum<E>> EnumSet<E> getEnumSet(String
key, Class<E> enumClass, boolean ignoreUnknown)
Whitespace is ignored, case is ignored and the value "*" is mapped to
"all values of the enum". If "ignoreUnknown" is true then when parsing, unknown
values are ignored. This is recommended for forward compatiblity with later
versions.
2. This support is implemented in
org.apache.hadoop.fs.s3a.impl.ConfigurationHelper -it can be used elsewhere in
the hadoop codebase.
3. A new private FlagSet class in hadoop common manages a set of enum flags.
It implements StreamCapabilities and can be probed for a specific
option being set
(with a prefix)
S3A adds an option fs.s3a.performance.flags which builds a FlagSet with enum
type PerformanceFlagEnum
* which initially contains {Create, Delete, Mkdir, Open}
* the existing fs.s3a.create.performance option sets the flag "Create".
* tests which configure fs.s3a.create.performance MUST clear
fs.s3a.performance.flags in test setup.
Future performance flags are planned, with different levels of safety and/or
backwards compatibility.
Contributed by Steve Loughran
### For code changes:
- [ ] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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