scylladb/scylladb
Jun 2024 – Apr 2026
21 Months active
Languages Used
C++PythonMarkdownINIreStructuredTextCMakeYAMLShell
Technical Skills
API developmentAWS DynamoDBC++Pythonbackend developmentcode refactoring
Nadav Har'El
PROFILE
Nadav Har'el
Over 21 months, Nadav Har'El contributed to the scylladb/scylladb repository by building and enhancing core database features, focusing on Alternator’s DynamoDB compatibility, materialized views, and CDC integration. He engineered robust API endpoints, expanded test coverage, and improved system reliability through targeted bug fixes and infrastructure modernization. Using C++, Python, and CQL, Nadav implemented features such as per-row TTL, live configuration updates, and secure request handling, while refactoring code for maintainability and performance. His work addressed concurrency, error handling, and cross-version compatibility, resulting in a more stable, performant, and developer-friendly backend for distributed database deployments.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
256Total
Bugs
46
Commits
256
Features
68
Lines of code
886,278
Activity Months21
Your Network
196 peopleWork History
April 2026
2 Commits
Apr 1, 2026April 2026 monthly summary for scylladb/scylladb focusing on CDC integration and vector-index related reliability improvements.
2 Commits
Apr 1, 2026April 2026 monthly summary for scylladb/scylladb focusing on CDC integration and vector-index related reliability improvements.
April 2026
March 2026
9 Commits • 3 Features
Mar 1, 2026March 2026 (2026-03) monthly summary for scylladb/scylladb focused on stability, test reliability, and expanded test coverage. Key work delivered includes robust error handling improvements in CQL front-end to prevent crashes, enhanced logging, and better observability; test suite hardening across versions and environments to reduce CI flakiness; and new coverage for ReturnConsumedCapacity and INDEXES in Alternator tests. These changes collectively improve cluster resilience, developer productivity, and delivery confidence for new features.
March 2026
9 Commits • 3 Features
Mar 1, 2026March 2026 (2026-03) monthly summary for scylladb/scylladb focused on stability, test reliability, and expanded test coverage. Key work delivered includes robust error handling improvements in CQL front-end to prevent crashes, enhanced logging, and better observability; test suite hardening across versions and environments to reduce CI flakiness; and new coverage for ReturnConsumedCapacity and INDEXES in Alternator tests. These changes collectively improve cluster resilience, developer productivity, and delivery confidence for new features.
February 2026
8 Commits • 4 Features
Feb 1, 2026February 2026 monthly work summary for scylladb/scylladb focusing on expanding test coverage and stabilizing Alternator-related paths across multiple dimensions (write isolation modes, TTL expiration, replica selection, and security controls). The efforts deliver concrete regression tests, fix a key correctness issue, and address a known vulnerability, all aimed at strengthening reliability, performance predictability, and business value for customers relying on Alternator, TTL, and DynamoDB compatibility.
8 Commits • 4 Features
Feb 1, 2026February 2026 monthly work summary for scylladb/scylladb focusing on expanding test coverage and stabilizing Alternator-related paths across multiple dimensions (write isolation modes, TTL expiration, replica selection, and security controls). The efforts deliver concrete regression tests, fix a key correctness issue, and address a known vulnerability, all aimed at strengthening reliability, performance predictability, and business value for customers relying on Alternator, TTL, and DynamoDB compatibility.
February 2026
January 2026
37 Commits • 7 Features
Jan 1, 2026January 2026 (2026-01) focused on delivering core platform capabilities, improving test stability, and strengthening cross-database compatibility for ScyllaDB. Key features include the CQL per-row TTL feature across CREATE TABLE, DESC TABLE, and ALTER TABLE with TTL column designation (supporting timestamp, bigint, and int), plus integration of the TTL expiration service into both Alternator and CQL workflows with a cluster feature flag (CQL_ROW_TTL) to coordinate rollout. In parallel, extensive Cassandra-to-cqlpy translations were completed to boost regression coverage and compatibility, including license headers and new reproducer tests. Major bugs fixed span query description logic and test stability: DESC KEYSPACES now behaves correctly when USE is in effect; test harness cleanup stabilizes cqlpy test runs; numerous Alternator/DynamoDB compatibility fixes (timeout handling, error messages, header canonization) were implemented; and assertion safety improved by introducing throwing_assert and replacing SCYLLA_ASSERT in Alternator. Overall impact includes faster, more reliable TTL-driven data expiration in CQL, stronger cross-database compatibility with Cassandra, and higher test reliability and performance. Technologies/skills demonstrated include TTL expiration workflows, CQL and Alternator integration, test automation and porting (pytest assertion rewriting), cross-database testing, and code quality improvements.
January 2026
37 Commits • 7 Features
Jan 1, 2026January 2026 (2026-01) focused on delivering core platform capabilities, improving test stability, and strengthening cross-database compatibility for ScyllaDB. Key features include the CQL per-row TTL feature across CREATE TABLE, DESC TABLE, and ALTER TABLE with TTL column designation (supporting timestamp, bigint, and int), plus integration of the TTL expiration service into both Alternator and CQL workflows with a cluster feature flag (CQL_ROW_TTL) to coordinate rollout. In parallel, extensive Cassandra-to-cqlpy translations were completed to boost regression coverage and compatibility, including license headers and new reproducer tests. Major bugs fixed span query description logic and test stability: DESC KEYSPACES now behaves correctly when USE is in effect; test harness cleanup stabilizes cqlpy test runs; numerous Alternator/DynamoDB compatibility fixes (timeout handling, error messages, header canonization) were implemented; and assertion safety improved by introducing throwing_assert and replacing SCYLLA_ASSERT in Alternator. Overall impact includes faster, more reliable TTL-driven data expiration in CQL, stronger cross-database compatibility with Cassandra, and higher test reliability and performance. Technologies/skills demonstrated include TTL expiration workflows, CQL and Alternator integration, test automation and porting (pytest assertion rewriting), cross-database testing, and code quality improvements.
December 2025
27 Commits • 4 Features
Dec 1, 2025Month: 2025-12. Focused on strengthening test infrastructure and expanding Alternator capabilities, delivering tangible business value through faster feedback loops, improved error visibility, and network-cost optimization. Notable work includes refactoring the test utility to centralize request signing and introducing a test helper to streamline sending signed requests; enabling deflate encoding in Alternator request compression with associated tests; publishing guidance on reducing Alternator network costs; fixing JSON parsing error message generation with regression coverage; and adding reproducer tests to prevent regressions (e.g., issue #27375).
27 Commits • 4 Features
Dec 1, 2025Month: 2025-12. Focused on strengthening test infrastructure and expanding Alternator capabilities, delivering tangible business value through faster feedback loops, improved error visibility, and network-cost optimization. Notable work includes refactoring the test utility to centralize request signing and introducing a test helper to streamline sending signed requests; enabling deflate encoding in Alternator request compression with associated tests; publishing guidance on reducing Alternator network costs; fixing JSON parsing error message generation with regression coverage; and adding reproducer tests to prevent regressions (e.g., issue #27375).
December 2025
November 2025
19 Commits • 5 Features
Nov 1, 2025November 2025 monthly performance summary for scylladb/scylladb. Focused on delivering business-value features, hardening stability, expanding test coverage, and improving documentation. Key outcomes include live updates for tablets_mode_for_new_keyspaces with enhanced error surfacing, gzip-compressed requests support in Alternator with signature verification and required dependencies, and broader validation of compression behavior across base and auxiliary tables. Also fixed authentication error statistics to update the correct shard, and extended ExclusiveStartKey testing across Query/Scan/GSIs with improvements to test infrastructure for three-rack clusters and materialized views.
November 2025
19 Commits • 5 Features
Nov 1, 2025November 2025 monthly performance summary for scylladb/scylladb. Focused on delivering business-value features, hardening stability, expanding test coverage, and improving documentation. Key outcomes include live updates for tablets_mode_for_new_keyspaces with enhanced error surfacing, gzip-compressed requests support in Alternator with signature verification and required dependencies, and broader validation of compression behavior across base and auxiliary tables. Also fixed authentication error statistics to update the correct shard, and extended ExclusiveStartKey testing across Query/Scan/GSIs with improvements to test infrastructure for three-rack clusters and materialized views.
October 2025
4 Commits
Oct 1, 2025Concise monthly summary for 2025-10 focusing on reliability improvements for tests, TTL/cdc correctness, and paging validation in scylladb/scylladb. Delivered multiple test hardening commits, fixed TTL event generation and JSON field capitalization, updated seastar submodule with HTTP header fix, and added page_size=0 paging-disabled test. These changes raise CI determinism, enable targeted backports, and strengthen client-visible behavior.
4 Commits
Oct 1, 2025Concise monthly summary for 2025-10 focusing on reliability improvements for tests, TTL/cdc correctness, and paging validation in scylladb/scylladb. Delivered multiple test hardening commits, fixed TTL event generation and JSON field capitalization, updated seastar submodule with HTTP header fix, and added page_size=0 paging-disabled test. These changes raise CI determinism, enable targeted backports, and strengthen client-visible behavior.
October 2025
September 2025
16 Commits • 3 Features
Sep 1, 2025Month 2025-09 monthly summary focusing on key accomplishments and business value. Concise highlights: - Key features delivered: • CDC Permissions Semantics and Usability: introduced inheritance of permissions from base tables to CDC logs and materialized views; added tests and documentation to verify behavior and usability of querying CDC tables (PRs and commits across scylladb/scylladb). • Alternator Testing, Stability, and Regression Coverage: centralized internal tags and comprehensive regression tests for DescribeTable GSIs/LSIs; test fixes for DynamoDB interactions; overall test stability improvements. • Cassandra/Java Compatibility Testing Tooling: updated testing workflow to support Java 21 while preserving compatibility notes for older Cassandra versions and updating Fedora 42 Java 11 guidance. - Major bugs fixed: • DynamoDB/Alternator: fixed UpdateItem with ALL_OLD and old AttributeUpdates interaction; improved error messaging for list index overflow and for incorrect ARNs; added regression tests to prevent regressions. • General test resilience: multiple test fixes and portability improvements to ensure parity with DynamoDB and stability across environments. - Overall impact and accomplishments: • Increased security and correctness by aligning CDC and MV permissions with base-table permissions and clarifying expected behavior; improved reliability and developer productivity through better error messages and comprehensive tests; strengthened cross-version compatibility for Alternator and Cassandra tooling. - Technologies/skills demonstrated: • CQL/CQLPY testing, CDC and Materialized Views permission modeling, DynamoDB/Alternator compatibility, regression test development, Seastar-based error handling improvements, Java 21 compatibility in testing workflow. Business value: clearer permission semantics reduce risk of unauthorized data exposure; robust, automated test coverage lowers regression risk; cross-version tooling reduces onboarding time and support load.
September 2025
16 Commits • 3 Features
Sep 1, 2025Month 2025-09 monthly summary focusing on key accomplishments and business value. Concise highlights: - Key features delivered: • CDC Permissions Semantics and Usability: introduced inheritance of permissions from base tables to CDC logs and materialized views; added tests and documentation to verify behavior and usability of querying CDC tables (PRs and commits across scylladb/scylladb). • Alternator Testing, Stability, and Regression Coverage: centralized internal tags and comprehensive regression tests for DescribeTable GSIs/LSIs; test fixes for DynamoDB interactions; overall test stability improvements. • Cassandra/Java Compatibility Testing Tooling: updated testing workflow to support Java 21 while preserving compatibility notes for older Cassandra versions and updating Fedora 42 Java 11 guidance. - Major bugs fixed: • DynamoDB/Alternator: fixed UpdateItem with ALL_OLD and old AttributeUpdates interaction; improved error messaging for list index overflow and for incorrect ARNs; added regression tests to prevent regressions. • General test resilience: multiple test fixes and portability improvements to ensure parity with DynamoDB and stability across environments. - Overall impact and accomplishments: • Increased security and correctness by aligning CDC and MV permissions with base-table permissions and clarifying expected behavior; improved reliability and developer productivity through better error messages and comprehensive tests; strengthened cross-version compatibility for Alternator and Cassandra tooling. - Technologies/skills demonstrated: • CQL/CQLPY testing, CDC and Materialized Views permission modeling, DynamoDB/Alternator compatibility, regression test development, Seastar-based error handling improvements, Java 21 compatibility in testing workflow. Business value: clearer permission semantics reduce risk of unauthorized data exposure; robust, automated test coverage lowers regression risk; cross-version tooling reduces onboarding time and support load.
August 2025
14 Commits • 4 Features
Aug 1, 2025August 2025 — scylladb/scylladb: Key reliability, performance, and observability enhancements across test infrastructure, test modernization, and core features. Highlights include: hardened test infrastructure enabling abrupt termination of starting servers and fast-fail boot tests, dramatically reducing CI durations; a major test-suite modernization drive with Python-based secondary index tests and fixes to improve Cassandra parity; added configurability for internal page size to tune internal scans during aggregation, grouping, and secondary index workloads; introduction of Alternator authorization controls and observability with a new warn mode, new metrics, and logging; base64 decoding fix and related cleanup to improve correctness and stability; and several stability-focused refactors to improve build times and reliability.
14 Commits • 4 Features
Aug 1, 2025August 2025 — scylladb/scylladb: Key reliability, performance, and observability enhancements across test infrastructure, test modernization, and core features. Highlights include: hardened test infrastructure enabling abrupt termination of starting servers and fast-fail boot tests, dramatically reducing CI durations; a major test-suite modernization drive with Python-based secondary index tests and fixes to improve Cassandra parity; added configurability for internal page size to tune internal scans during aggregation, grouping, and secondary index workloads; introduction of Alternator authorization controls and observability with a new warn mode, new metrics, and logging; base64 decoding fix and related cleanup to improve correctness and stability; and several stability-focused refactors to improve build times and reliability.
August 2025
July 2025
18 Commits • 3 Features
Jul 1, 2025July 2025 monthly summary for scylladb/scylladb focusing on business value and technical achievement across features, fixes, and tooling. Key outcomes include improved observability and reliability for Alternator, major RPC/utility refactors for maintainability and safer destruction, expanded testing and documentation coverage for Cqlpy and Alternator, and stabilized test tooling and CI infrastructure.
July 2025
18 Commits • 3 Features
Jul 1, 2025July 2025 monthly summary for scylladb/scylladb focusing on business value and technical achievement across features, fixes, and tooling. Key outcomes include improved observability and reliability for Alternator, major RPC/utility refactors for maintainability and safer destruction, expanded testing and documentation coverage for Cqlpy and Alternator, and stabilized test tooling and CI infrastructure.
June 2025
17 Commits • 5 Features
Jun 1, 2025June 2025: Delivered core feature enhancements, stability improvements, and testing improvements across the Alternator interface and ScyllaDB core. Key outcomes include cross-platform materialized view consistency validation, naming-limits with streams support, large-result streaming optimizations, and expanded test coverage driving CI parity. These changes reduce risk, improve performance, and accelerate reliability in production deployments.
17 Commits • 5 Features
Jun 1, 2025June 2025: Delivered core feature enhancements, stability improvements, and testing improvements across the Alternator interface and ScyllaDB core. Key outcomes include cross-platform materialized view consistency validation, naming-limits with streams support, large-result streaming optimizations, and expanded test coverage driving CI parity. These changes reduce risk, improve performance, and accelerate reliability in production deployments.
June 2025
May 2025
3 Commits • 2 Features
May 1, 2025May 2025 performance summary for scylladb/scylladb focused on expanding test coverage for system tables and tightening security for Alternator tag exposure. Delivered cross-version validation for secondary index system tables (system."IndexInfo" and system_schema.indexes) with new tests and fixtures, while hardening internal tag governance to prevent exposure of internal system tags (except system:write_isolation). Issued targeted test fixes to ensure stability of the release-mode CI workflow (e.g., run --release 2025.1).
May 2025
3 Commits • 2 Features
May 1, 2025May 2025 performance summary for scylladb/scylladb focused on expanding test coverage for system tables and tightening security for Alternator tag exposure. Delivered cross-version validation for secondary index system tables (system."IndexInfo" and system_schema.indexes) with new tests and fixtures, while hardening internal tag governance to prevent exposure of internal system tags (except system:write_isolation). Issued targeted test fixes to ensure stability of the release-mode CI workflow (e.g., run --release 2025.1).
April 2025
11 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary focused on delivering business-value through robustness, stability, and build/test reliability improvements across the core data plane and development lifecycle. The work reduces risk of large, stall-prone result sets, increases configurability for runtime behavior, and improves visibility and CI reliability, enabling faster iteration and safer deployments.
11 Commits • 2 Features
Apr 1, 2025April 2025 monthly summary focused on delivering business-value through robustness, stability, and build/test reliability improvements across the core data plane and development lifecycle. The work reduces risk of large, stall-prone result sets, increases configurability for runtime behavior, and improves visibility and CI reliability, enabling faster iteration and safer deployments.
April 2025
March 2025
9 Commits • 2 Features
Mar 1, 20252025-03 Monthly summary for scylladb/scylladb highlighting reliability, performance, and test-coverage improvements related to Alternator, plus test-stability work across CQL/Python tooling. Focus is on delivering business value through robust request handling, memory safety, and reduced test flakiness, enabling more predictable production performance and faster release cycles.
March 2025
9 Commits • 2 Features
Mar 1, 20252025-03 Monthly summary for scylladb/scylladb highlighting reliability, performance, and test-coverage improvements related to Alternator, plus test-stability work across CQL/Python tooling. Focus is on delivering business value through robust request handling, memory safety, and reduced test flakiness, enabling more predictable production performance and faster release cycles.
February 2025
5 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for scylladb/scylladb focusing on delivering improvements to release fetch workflows, strengthening test reliability, and reducing onboarding friction for contributors. Highlights include enabling anonymous downloads for 2025+ releases, refining release artifact path logic, and hardening the test suite to prevent regressions and reduce runtime.
5 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for scylladb/scylladb focusing on delivering improvements to release fetch workflows, strengthening test reliability, and reducing onboarding friction for contributors. Highlights include enabling anonymous downloads for 2025+ releases, refining release artifact path logic, and hardening the test suite to prevent regressions and reduce runtime.
February 2025
January 2025
13 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for scylladb/scylladb. This period delivered substantial improvements to the Alternator test infrastructure, stabilized GSI and view-building workflows, expanded functional coverage for DynamoDB-style multi-item transactions, and tightened build/runtime compatibility for older Scylla releases. The work enhances test reliability, reduces flaky behavior, and accelerates feedback on changes that affect DynamoDB-compatible features across environments.
January 2025
13 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for scylladb/scylladb. This period delivered substantial improvements to the Alternator test infrastructure, stabilized GSI and view-building workflows, expanded functional coverage for DynamoDB-style multi-item transactions, and tightened build/runtime compatibility for older Scylla releases. The work enhances test reliability, reduces flaky behavior, and accelerates feedback on changes that affect DynamoDB-compatible features across environments.
December 2024
23 Commits • 14 Features
Dec 1, 2024Month: 2024-12 — Delivered and stabilized core Alternator capabilities with a strong emphasis on test coverage, reliability, and clear documentation. Achieved RBAC-aware GSI testing, expanded visibility of index states, and advanced materialized-view and MV-related test suites, enabling safer feature rollouts and faster bug detection across the storage engine.
23 Commits • 14 Features
Dec 1, 2024Month: 2024-12 — Delivered and stabilized core Alternator capabilities with a strong emphasis on test coverage, reliability, and clear documentation. Achieved RBAC-aware GSI testing, expanded visibility of index states, and advanced materialized-view and MV-related test suites, enabling safer feature rollouts and faster bug detection across the storage engine.
December 2024
November 2024
13 Commits • 3 Features
Nov 1, 2024November 2024 monthly summary for scylladb/scylladb focused on reliability, maintainability, and developer productivity. Delivered targeted fixes to the Alternator API, strengthened testing infrastructure, clarified DynamoDB compatibility in documentation, and modernized core code paths. These efforts reduced operational risk, improved CI reliability, and laid groundwork for future performance and compatibility improvements across the ScyllaDB ecosystem.
November 2024
13 Commits • 3 Features
Nov 1, 2024November 2024 monthly summary for scylladb/scylladb focused on reliability, maintainability, and developer productivity. Delivered targeted fixes to the Alternator API, strengthened testing infrastructure, clarified DynamoDB compatibility in documentation, and modernized core code paths. These efforts reduced operational risk, improved CI reliability, and laid groundwork for future performance and compatibility improvements across the ScyllaDB ecosystem.
October 2024
3 Commits • 1 Features
Oct 1, 2024October 2024: Delivered modernization of testing infrastructure for scylladb/scylladb. Migrated materialized view tests from C++ Boost to Python cqlpy, improving debugging and test organization, and introduced a --release option to run Alternator tests against specific older Scylla releases for cross-version bug verification. Stabilized flaky tests by removing broken pytest fixture 'alternator3' in topology_experimental_raft, eliminating flakiness. These changes enhanced test reliability, maintainability, and cross-version coverage, enabling faster feedback and clearer test outcomes. Demonstrated skills in Python-based test tooling, cqlpy integration, pytest fixture management, and cross-version testing orchestration.
3 Commits • 1 Features
Oct 1, 2024October 2024: Delivered modernization of testing infrastructure for scylladb/scylladb. Migrated materialized view tests from C++ Boost to Python cqlpy, improving debugging and test organization, and introduced a --release option to run Alternator tests against specific older Scylla releases for cross-version bug verification. Stabilized flaky tests by removing broken pytest fixture 'alternator3' in topology_experimental_raft, eliminating flakiness. These changes enhanced test reliability, maintainability, and cross-version coverage, enabling faster feedback and clearer test outcomes. Demonstrated skills in Python-based test tooling, cqlpy integration, pytest fixture management, and cross-version testing orchestration.
October 2024
September 2024
1 Commits • 1 Features
Sep 1, 2024In September 2024, delivered Dynamic Configurable Delay for Materialized View Flow-Control in scylladb/scylladb, adding a configurable maximum delay to the materialized view flow-control pipeline. This enables tuning of latency versus throughput based on workload, including the ability to set zero delay in emergency scenarios to improve responsiveness under spikes.
September 2024
1 Commits • 1 Features
Sep 1, 2024In September 2024, delivered Dynamic Configurable Delay for Materialized View Flow-Control in scylladb/scylladb, adding a configurable maximum delay to the materialized view flow-control pipeline. This enables tuning of latency versus throughput based on workload, including the ability to set zero delay in emergency scenarios to improve responsiveness under spikes.
June 2024
4 Commits • 1 Features
Jun 1, 2024June 2024 focused on delivering business-value enhancements for Alternator by enabling dynamic configuration management and strengthening test tooling, while laying groundwork for cross-node concurrency improvements. Key deliverables include Alternator configuration management with read/write access to configuration parameters via system tables, plus authorization controls and test utilities for reading and modifying configuration during tests. The month also included refactoring to reduce duplicated test code in Alternator tests. In parallel, I reproduced a read-modify-write timeout across nodes (InternalServerError) to surface LWT uncertainties in multi-node scenarios, informing further investigation. Impact: improved configurability and safety for deployments, faster/testable workflows, and a clear path toward more robust cross-node operations. Technologies and skills demonstrated: system tables, Alternator, authorization controls, test utilities and helpers, test code hygiene, LWT/concurrency investigation, multi-node testing.
4 Commits • 1 Features
Jun 1, 2024June 2024 focused on delivering business-value enhancements for Alternator by enabling dynamic configuration management and strengthening test tooling, while laying groundwork for cross-node concurrency improvements. Key deliverables include Alternator configuration management with read/write access to configuration parameters via system tables, plus authorization controls and test utilities for reading and modifying configuration during tests. The month also included refactoring to reduce duplicated test code in Alternator tests. In parallel, I reproduced a read-modify-write timeout across nodes (InternalServerError) to surface LWT uncertainties in multi-node scenarios, informing further investigation. Impact: improved configurability and safety for deployments, faster/testable workflows, and a clear path toward more robust cross-node operations. Technologies and skills demonstrated: system tables, Alternator, authorization controls, test utilities and helpers, test code hygiene, LWT/concurrency investigation, multi-node testing.
June 2024
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Quality Metrics
Correctness95.8%
Maintainability93.2%
Architecture91.4%
Performance89.0%
AI Usage23.0%
Skills & Technologies
Programming Languages
C++CMakeINIMarkdownPythonShellYAMLcmakepythonreStructuredText
Technical Skills
API DesignAPI DevelopmentAPI ImplementationAPI developmentAPI integrationAWSAWS DynamoDBAWS SDKAWS SDK (Boto3)AWS SDK (boto3)AlternatorAsynchronous ProgrammingAutomationBackend DevelopmentBase64 Encoding/Decoding
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