xushiyan commented on code in PR #17827: URL: https://github.com/apache/hudi/pull/17827#discussion_r2785845857
########## rfc/rfc-103/rfc-103.md: ########## @@ -0,0 +1,246 @@ + <!-- + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You under the Apache License, Version 2.0 + (the "License"); you may not use this file except in compliance with + the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--> +# RFC-103: Hudi LSM tree layout + +## Proposers + +- @zhangyue19921010 +- @xushiyan + +## Approvers +- @danny0405 +- @vinothchandar + +## Status + +Main issue: https://github.com/apache/hudi/issues/14310 + +## Background + +LSM Trees (Log-Structured Merge-Trees) are data structures optimized for write-intensive workloads and are widely used in modern database systems such as Paimon, LevelDB, RocksDB, Cassandra, etc. By leveraging sequential writes and a tiered merge (compaction) mechanism, they offer clear advantages in: + +- **High write throughput** +- **Efficient, tiered compaction** +- **Optimized read paths** + +## Goal + +This RFC proposes applying LSM-inspired principles (**sequential writes + tiered merges**) to improve the data organization protocol for **Hudi MOR tables**, and replacing **Avro** with **Parquet** as the on-disk format for individual log files, to achieve: + +1. Improve the **read performance**, **write performance**, and **overall stability** of MOR tables—especially for **wide tables**—in scenarios such as: Review Comment: clarified the comparison is with avro log file -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
