virajjasani commented on code in PR #7: URL: https://github.com/apache/phoenix-adapters/pull/7#discussion_r3314601595
########## README.md: ########## @@ -196,3 +196,80 @@ Logs are stored in the following locations: - Main log: `$PHOENIX_ADAPTERS_LOG_DIR/rest.log` - GC log: `$PHOENIX_ADAPTERS_LOG_DIR/gc.log` - Heap dumps: `$PHOENIX_ADAPTERS_LOG_DIR/` (on OutOfMemoryError) + +## DynamoDB-Compatible Alternatives + +Several open-source projects provide DynamoDB-compatible APIs on non-AWS infrastructure. Here's how they compare: + +> _Analysis as of **2026-05-27**._ + +### At a Glance + +| | **Phoenix-Adapters** | **ScyllaDB Alternator** | **ExtendDB** | +|---|---|---|---| +| **Storage Engine** | Apache Phoenix / HBase | ScyllaDB (embedded) | PostgreSQL | +| **Language** | Java | C++ | Rust | +| **Deployment** | Stateless REST servers + HBase cluster | Built into every ScyllaDB node | Single binary + PostgreSQL | + +### API Coverage + +| Operation | Phoenix-Adapters | Alternator | ExtendDB | +|---|:---:|:---:|:---:| +| CreateTable / DeleteTable / DescribeTable / ListTables | ✅ | ✅ | ✅ | +| PutItem / GetItem / DeleteItem / UpdateItem | ✅ | ✅ | ✅ | +| Query / Scan | ✅ | ✅ | ✅ | +| BatchGetItem / BatchWriteItem | ✅ | ✅ | ✅ | +| TransactWriteItems / TransactGetItems | ❌ | ❌ | ✅ | +| DynamoDB Streams | ✅ | ✅ | ✅ | +| GSI / LSI | ✅ | ✅ | ✅ | +| TTL | ✅ | ✅ | ✅ | +| Backup / Restore | ❌ | ❌ | ✅ | +| Import / Export | ❌ | ❌ | ✅ | +| Tagging | ❌ | ✅ | ✅ | +| PartiQL | ❌ | ❌ | ❌ | + +### Expressions & Query Features + +| Feature | Phoenix-Adapters | Alternator | ExtendDB | +|---|:---:|:---:|:---:| +| ConditionExpression | ✅ | ✅ | ✅ | +| FilterExpression | ✅ | ✅ | ✅ | +| ProjectionExpression | ✅ | ✅ | ✅ | +| UpdateExpression (SET/REMOVE/ADD/DELETE) | ✅ | ✅ | ✅ | +| KeyConditionExpression | ✅ | ✅ | ✅ | +| Legacy APIs (Expected, AttributesToGet, ScanFilter) | ✅ | ✅ | ❌ | + +### Scalability & Operations + +| | Phoenix-Adapters | Alternator | ExtendDB | +|---|---|---|---| +| **Horizontal scale** | Petabytes (HBase regions) | Petabytes (ScyllaDB vnodes) | Limited (PG vertical) | +| **Multi-instance safe** | ✅ Stateless tier | ✅ Native (peer-to-peer) | ❌ No coordination (documented gap) | +| **Write distribution** | Across HBase region servers | Across ScyllaDB nodes | Single PG writer | +| **Consistency** | Configurable (HBase) | Tunable (LOCAL_ONE / LOCAL_QUORUM) | Strong (PG default) | +| **Operational complexity** | High (HBase + Phoenix + ZK) | Medium (ScyllaDB cluster) | Low (binary + PG) | + +### Design Philosophy + +| | Phoenix-Adapters | Alternator | ExtendDB | +|---|---|---|---| +| **Approach** | Many APIs → one backend | Embedded in storage engine | One API → pluggable backends | +| **Expression evaluation** | Server-side (Phoenix UDFs) | Native C++ in storage layer | In-process Rust evaluator | Review Comment: `Server-side (Phoenix UDFs)` => `Server-side Phoenix functions` ########## README.md: ########## @@ -196,3 +196,80 @@ Logs are stored in the following locations: - Main log: `$PHOENIX_ADAPTERS_LOG_DIR/rest.log` - GC log: `$PHOENIX_ADAPTERS_LOG_DIR/gc.log` - Heap dumps: `$PHOENIX_ADAPTERS_LOG_DIR/` (on OutOfMemoryError) + +## DynamoDB-Compatible Alternatives + +Several open-source projects provide DynamoDB-compatible APIs on non-AWS infrastructure. Here's how they compare: + +> _Analysis as of **2026-05-27**._ + +### At a Glance + +| | **Phoenix-Adapters** | **ScyllaDB Alternator** | **ExtendDB** | +|---|---|---|---| +| **Storage Engine** | Apache Phoenix / HBase | ScyllaDB (embedded) | PostgreSQL | +| **Language** | Java | C++ | Rust | +| **Deployment** | Stateless REST servers + HBase cluster | Built into every ScyllaDB node | Single binary + PostgreSQL | + +### API Coverage + +| Operation | Phoenix-Adapters | Alternator | ExtendDB | +|---|:---:|:---:|:---:| +| CreateTable / DeleteTable / DescribeTable / ListTables | ✅ | ✅ | ✅ | +| PutItem / GetItem / DeleteItem / UpdateItem | ✅ | ✅ | ✅ | +| Query / Scan | ✅ | ✅ | ✅ | +| BatchGetItem / BatchWriteItem | ✅ | ✅ | ✅ | +| TransactWriteItems / TransactGetItems | ❌ | ❌ | ✅ | +| DynamoDB Streams | ✅ | ✅ | ✅ | +| GSI / LSI | ✅ | ✅ | ✅ | +| TTL | ✅ | ✅ | ✅ | +| Backup / Restore | ❌ | ❌ | ✅ | +| Import / Export | ❌ | ❌ | ✅ | +| Tagging | ❌ | ✅ | ✅ | +| PartiQL | ❌ | ❌ | ❌ | + +### Expressions & Query Features + +| Feature | Phoenix-Adapters | Alternator | ExtendDB | +|---|:---:|:---:|:---:| +| ConditionExpression | ✅ | ✅ | ✅ | +| FilterExpression | ✅ | ✅ | ✅ | +| ProjectionExpression | ✅ | ✅ | ✅ | +| UpdateExpression (SET/REMOVE/ADD/DELETE) | ✅ | ✅ | ✅ | +| KeyConditionExpression | ✅ | ✅ | ✅ | +| Legacy APIs (Expected, AttributesToGet, ScanFilter) | ✅ | ✅ | ❌ | + +### Scalability & Operations + +| | Phoenix-Adapters | Alternator | ExtendDB | +|---|---|---|---| +| **Horizontal scale** | Petabytes (HBase regions) | Petabytes (ScyllaDB vnodes) | Limited (PG vertical) | +| **Multi-instance safe** | ✅ Stateless tier | ✅ Native (peer-to-peer) | ❌ No coordination (documented gap) | +| **Write distribution** | Across HBase region servers | Across ScyllaDB nodes | Single PG writer | +| **Consistency** | Configurable (HBase) | Tunable (LOCAL_ONE / LOCAL_QUORUM) | Strong (PG default) | +| **Operational complexity** | High (HBase + Phoenix + ZK) | Medium (ScyllaDB cluster) | Low (binary + PG) | Review Comment: `High (HBase + Phoenix + ZK)` => `Medium (HBase + Phoenix)` -- This is an automated message from the Apache Git Service. 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