generated: '2026-09-05'
method: searched
source: >-
  https://github.com/delta-io/delta/releases, https://github.com/delta-io/delta-sharing/releases,
  https://github.com/delta-io/delta/blob/master/PROTOCOL.md,
  https://github.com/delta-io/delta-sharing/blob/main/PROTOCOL.md, https://delta.io/roadmap
  (all fetched 2026-09-05)
provider: Delta Lake
providerId: delta-lake
versioning:
  scheme: semver
  current:
    delta_lake: 4.4.0
    delta_lake_released: '2026-08-20'
    delta_lake_lts_line: 3.3.3
    delta_lake_lts_released: '2026-08-12'
    delta_sharing_server: 1.4.1
    delta_sharing_server_released: '2026-07-22'
    delta_sharing_python_client: 1.4.2
    delta_sharing_python_client_released: '2026-08-12'
  cadence: >-
    Two active lines are maintained in parallel — a 4.x line tracking current Apache Spark and
    a 3.x maintenance line. Six feature or patch releases shipped between 2026-01-16 and
    2026-08-20.
  compatibility_mechanism: >-
    Delta Lake does not version the storage format with a URL or media type. Compatibility is
    negotiated through the transaction log itself: minReaderVersion / minWriterVersion plus
    the Table Features mechanism, where a table enumerates the named features a client must
    understand to read or write it. The Delta Sharing REST protocol negotiates separately
    through the delta-sharing-capabilities request header.
  docs:
    - https://github.com/delta-io/delta/blob/master/PROTOCOL.md#table-features
    - https://github.com/delta-io/delta-sharing/blob/main/PROTOCOL.md#delta-sharing-capabilities-header
deprecation:
  policy_published: partial
  mechanism: >-
    Deprecations are announced inline in the normative protocol specifications with a named
    replacement, and where a date is committed it is stated in the spec text. There is no
    separate written deprecation policy document, no Sunset or Deprecation response header
    (RFC 8594), and no deprecation feed.
  deprecated:
    - item: HEAD /shares/{share}/schemas/{schema}/tables/{table} (Query Table Version)
      replacement: GET .../tables/{table}/version
      stated_date: '2023-07-01'
      evidence: https://github.com/delta-io/delta-sharing/blob/main/PROTOCOL.md#query-table-version
      note: >-
        The spec states "we encourage that the HEAD API be deprecated by 07/01/2023" and marks
        the HEAD form "(deprecated)" in the request table. The published OpenAPI only declares
        the GET form, so the deprecated variant is spec-documented but not machine-readable.
    - item: predicateHints (SQL-expression file filtering in QueryTable)
      replacement: jsonPredicateHints
      stated_date: null
      evidence: https://github.com/delta-io/delta-sharing/blob/main/PROTOCOL.md#sql-expressions-for-filtering
      note: >-
        "We will deprecate the legacy predicateHints once all the delta sharing client and
        servers have moved to the json predicate based file filtering." No date is committed.
    - item: delta-iceberg (UniForm Iceberg module) on the 3.x line
      replacement: null
      stated_date: '2026-08-12'
      evidence: https://github.com/delta-io/delta/releases/tag/v3.3.3
      note: >-
        The 3.3.3 release notes state the patch release does not publish delta-iceberg. A
        module withdrawn from a maintenance release, called out in the release notes.
  deprecated_operations_in_spec: 0
  deprecated_operations_note: >-
    No operation in openapi/delta-lake-delta-sharing-protocol-openapi.yml carries
    deprecated: true.
status_page:
  published: false
  note: >-
    No status page exists and none is expected: Delta Lake is a self-hosted storage framework
    and a self-hosted sharing protocol, so there is no service whose availability the project
    could report. status.delta.io does not resolve (probed 2026-09-05, connection failed).
    No StatusPage pointer is emitted.
sla:
  published: false
  note: Open source project under LF Projects, LLC. No service-level agreement is offered.
support:
  channels:
    - name: Slack
      url: https://go.delta.io/slack
    - name: GitHub Issues
      url: https://github.com/delta-io/delta/issues
    - name: Getting Help
      url: https://delta.io/resources/getting-help
    - name: Stack Overflow
      url: https://stackoverflow.com/questions/tagged/delta-lake
roadmap:
  published: true
  url: https://delta.io/roadmap
  note: >-
    The roadmap page is a navigation hub to a GitHub project board and per-component
    repositories. It names no versions, dates or quarters (fetched 2026-09-05).
governance:
  foundation: LF AI & Data Foundation
  status: graduated
  url: https://lfaidata.foundation/projects/delta-lake/
  license: Apache-2.0