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https://issues.apache.org/jira/browse/HUDI-6242?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinoth Chandar updated HUDI-6242:
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Due Date: 13/Sep/23 (was: 30/Jun/23)
> Format changes for Hudi 1.X release line
> ----------------------------------------
>
> Key: HUDI-6242
> URL: https://issues.apache.org/jira/browse/HUDI-6242
> Project: Apache Hudi
> Issue Type: Epic
> Components: core
> Reporter: Vinoth Chandar
> Assignee: Vinoth Chandar
> Priority: Major
> Labels: hudi-umbrellas
> Fix For: 1.0.0
>
>
> This EPIC tracks changes to the Hudi storage format.
> Format change is anything that changes any bits related to
> - *Timeline* : active or archived timeline contents, file names.
> - *Base Files*: file format versions, any changes to any data types, file
> footers, file names.
> - *Log Files*: Block structure, content, names.
> - *Metadata Table*: (should we call this index table instead?) partition
> names, number of file groups, key/value schema and metadata to MDT row
> mappings.
> - *Table properties*: What's written to hoodie.properties.
> - *Marker files* : how would we treat these?
> The following functionality should be supportable by the new format tech
> specs (at a minimum)
> Flexibility :
> - Ability to mix different types of base files within a single table or even
> a single file group (e.g images, json, vectors ...)
> - Easy integration of metadata for JVM and non-jvm clients
> Metafields :
> - Should _recordkey be uuid special handling?
> Additional Info:
> - Support encoding of watermarks/event time fields as first class citizen,
> for handling late arriving data.
> - Position based skipping of base file
> - Additional metadata to avoid more RPCs to scan base file/log blocks.
> - ML/Column family use-case?
> - Support having changeset of columns in each write, other headers
> Log :
> - Support writing updates as deletes and inserts, instead of logging as
> update to base file.
> - CDC format is GA.
> Table organization:
> - Support different logical partitions on the same data
> - Storage of table spread across buckets/root folders
> - Decouple table location from timeline, metadata. They can all be in
> different places
> Concurrency/Timeline:
> - Ability to support general purpose multi-table transactions, esp between
> data and metadata tables.
> - Support lockless/non-blocking transactions, where writers don't block each
> other even in face of conflicts.
> - Support for long lived instants in timeline, break down distinction
> between active/archived
> - Support checking of uniqueness constraints, even in face of two concurrent
> insert transactions.
> - Support precise time-travel queries
> - Support time-travel writes.
> - Support schema history tracking and aid in schema evol impl.
> - TrueTime store/support for instant times
> Metadata table :
> - Encode filegroup ID and commit time along with file metadata
> Table Properties:
> - Partitioning information/indexing info
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