- Introduce avro to save clean metadata with details about the last commit that was retained
- Save rollback metadata in the meta timeline
- Create savepoint metadata and add API to createSavepoint, deleteSavepoint and rollbackToSavepoint
- Savepointed commit should not be rolledback or cleaned or archived
- introduce cli commands to show, create and rollback to savepoints
- Write unit tests to test savepoints and rollbackToSavepoints
* Add analytics to site
* Fix ugly favicon
* New & Improved HoodieDeltaStreamer
- Can incrementally consume from HDFS or Kafka, with exactly-once semantics!
- Supports Json/Avro data, Source can also do custom things
- Source is totally pluggable, via reflection
- Key generation is pluggable, currently added SimpleKeyGenerator
- Schema provider is pluggable, currently Filebased schemas
- Configurable field to break ties during preCombine
- Finally, can also plugin the HoodieRecordPayload, to get other merge types than overwriting
- Handles efficient avro serialization in Spark
Pending :
- Rewriting of HiveIncrPullSource
- Hive sync via hoodie-hive
- Cleanup & tests
* Minor fixes from master rebase
* Implementation of HiveIncrPullSource
- Copies commit by commit from source to target
* Adding TimestampBasedKeyGenerator
- Supports unix time & date strings
1. Create HoodieTable abstraction for commits and fileSystemView
2. HoodieMergeOnReadTable created
3. View is now always obtained from the table and the correct view based on the table type is returned
- Refactored timelines to be a single timeline for all active events and one for archived events. CommitTimeline and other timelines can be inferred by applying a filter on the activeTimelime
- Introduced HoodieInstant to abstract different types of action, commit time and if isInFlight
- Implemented other review comments
The following is the gist of changes done
- All low-level operation of creating a commit code was in HoodieClient which made it hard to share code if there was a compaction commit.
- HoodieTableMetadata contained a mix of metadata and filtering files. (Also few operations required FileSystem to be passed in because those were called from TaskExecutors and others had FileSystem as a global variable). Since merge-on-read requires a lot of that code, but will have to change slightly on how it operates on the metadata and how it filters the files. The two set of operation are split into HoodieTableMetaClient and TableFileSystemView.
- Everything (active commits, archived commits, cleaner log, save point log and in future delta and compaction commits) in HoodieTableMetaClient is a HoodieTimeline. Timeline is a series of instants, which has an in-built concept of inflight and completed commit markers.
- A timeline can be queries for ranges, contains and also use to create new datapoint (create a new commit etc). Commit (and all the above metadata) creation/deletion is streamlined in a timeline
- Multiple timelines can be merged into a single timeline, giving us an audit timeline to whatever happened in a hoodie dataset. This also helps with #55.
- Move to java 8 and introduce java 8 succinct syntax in refactored code
