Month: 2025-10 — Focused on stabilizing the polling path in DistributedPreviewManager for cdapio/cdap, improving maintainability and reducing state-violation risk during preview runs. Implemented a new private handlePollingViolation to centralize logic for handling poll-time violations when a runner polls for a new request while already assigned to a preview run, and removed redundant access enforcement in poll(). This work lays groundwork for more robust distributed previews and easier future changes. Commit reference: 1f7d1832ed66febba80f2961995fdb79ce3f1e02.

Summary for 2025-09: Delivered security hardening for Preview Runner communications and internal API access in cdapio/cdap, and implemented a race-free single-request-per-lifecycle polling policy for previews. These changes strengthen security, improve reliability for Preview workloads, and reduce risk of credential exposure. The work aligns with CDAP-21206/21211 and was implemented with RBAC considerations and messaging-service based authentication.

June 2025 performance-focused monthly summary for cdapio/cdap: Delivered two core features with clear business value and maintainability improvements.

April 2025 monthly summary for the cdapio/cdap workstream focused on storage efficiency improvements for ApplicationSpecifications in Cloud Spanner. The primary deliverable reduces the stored size of ApplicationSpecifications by refactoring serialization/deserialization to selectively include data based on the storage provider, controlled by a new config flag. This work aligns with CDAP-21163 and lays the groundwork for provider-specific optimizations and future performance improvements.

In March 2025, the team delivered one bug fix and one feature enhancement for cdapio/cdap. The Spanner deployment failure messaging was enhanced to catch FieldSizeLimitExceededException and rethrow as a clear, actionable error, with updates to AppMetadataStore and SpannerStructuredTable to improve diagnostics. A new compression configuration column, workflows.workflows_data, was added to optimize storage and processing for workflow data. These changes improve deployment reliability, reduce troubleshooting time, and drive storage efficiency and performance for workflow workloads.

February 2025 focused on reliability, performance, and storage enhancements for Spanner-backed components in cdapio/cdap. Delivered a resilient Spanner transaction retry mechanism, upgraded critical dependencies for compatibility, and added compression for string and bytes fields to improve storage efficiency. Also resolved a crash scenario caused by delayed Spanner table creation, improving pod stability and operational resilience.

For 2025-01, delivered reliability and performance enhancements across the Spanner Messaging Service and the Preview HTTP server in cdapio/cdap. Implemented indexing improvements, robust publish-time exception handling, configurability, and centralized messaging access via App Fabric, along with gzip compression for preview payloads. These changes improve throughput, reduce failure modes, and provide configurable rollout controls for maintenance and safety.

December 2024: CDAP Spanner Messaging enhancements delivered for cdapio/cdap. Key features and improvements implemented: - Spanner Messaging Service Enhancements: consolidated messaging client integration, fetch by timestamps and sequence IDs, and chunking support to break large payloads into parts in order to reliably store and retrieve data within Spanner limits. - Implemented cdap-messaging-spi extension for Spanner (Part 2) to enable a pluggable, scalable messaging backend. - Fixed messaging module used by Dataproc to ensure reliable operation in Dataproc workloads. - Consolidated updates to the messaging client module integration to streamline end-to-end messaging flows. Business value: Improved reliability, data integrity, and scalability of Spanner-backed messaging; enables precise time-based retrieval and handling of large payloads, supporting larger data pipelines and faster insights. Technical accomplishments include SPI extension development, multi-part payload handling, and cross-module integration across CDAP and Dataproc.

November 2024 monthly summary for cdapio/cdap focused on enabling Spanner-based messaging extensions and delivering batched storage optimizations. The period emphasized architectural groundwork, SPI/TMS refactoring, and performance-oriented changes to prepare for future production deployment of Spanner-backed services. No explicit bugs listed in the provided data.