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From "P. Taylor Goetz" <>
Subject Re: [VOTE] Accept Mnemonic into the Apache Incubator
Date Thu, 03 Mar 2016 19:19:06 GMT
+1 (binding)


> On Feb 29, 2016, at 12:37 PM, Patrick Hunt <> wrote:
> Hi folks,
> OK the discussion is now completed. Please VOTE to accept Mnemonic
> into the Apache Incubator. I’ll leave the VOTE open for at least
> the next 72 hours, with hopes to close it Thursday the 3rd of
> March, 2016 at 10am PT.
> [ ] +1 Accept Mnemonic as an Apache Incubator podling.
> [ ] +0 Abstain.
> [ ] -1 Don’t accept Mnemonic as an Apache Incubator podling because..
> Of course, I am +1 on this. Please note VOTEs from Incubator PMC
> members are binding but all are welcome to VOTE!
> Regards,
> Patrick
> --------------------
> = Mnemonic Proposal =
> === Abstract ===
> Mnemonic is a Java based non-volatile memory library for in-place
> structured data processing and computing. It is a solution for generic
> object and block persistence on heterogeneous block and
> byte-addressable devices, such as DRAM, persistent memory, NVMe, SSD,
> and cloud network storage.
> === Proposal ===
> Mnemonic is a structured data persistence in-memory in-place library
> for Java-based applications and frameworks. It provides unified
> interfaces for data manipulation on heterogeneous
> block/byte-addressable devices, such as DRAM, persistent memory, NVMe,
> SSD, and cloud network devices.
> The design motivation for this project is to create a non-volatile
> programming paradigm for in-memory data object persistence, in-memory
> data objects caching, and JNI-less IPC.
> Mnemonic simplifies the usage of data object caching, persistence, and
> JNI-less IPC for massive object oriented structural datasets.
> Mnemonic defines Non-Volatile Java objects that store data fields in
> persistent memory and storage. During the program runtime, only
> methods and volatile fields are instantiated in Java heap,
> Non-Volatile data fields are directly accessed via GET/SET operation
> to and from persistent memory and storage. Mnemonic avoids SerDes and
> significantly reduces amount of garbage in Java heap.
> Major features of Mnemonic:
> * Provides an abstract level of viewpoint to utilize heterogeneous
> block/byte-addressable device as a whole (e.g., DRAM, persistent
> memory, NVMe, SSD, HD, cloud network Storage).
> * Provides seamless support object oriented design and programming
> without adding burden to transfer object data to different form.
> * Avoids the object data serialization/de-serialization for data
> retrieval, caching and storage.
> * Reduces the consumption of on-heap memory and in turn to reduce and
> stabilize Java Garbage Collection (GC) pauses for latency sensitive
> applications.
> * Overcomes current limitations of Java GC to manage much larger
> memory resources for massive dataset processing and computing.
> * Supports the migration data usage model from traditional NVMe/SSD/HD
> to non-volatile memory with ease.
> * Uses lazy loading mechanism to avoid unnecessary memory consumption
> if some data does not need to use for computing immediately.
> * Bypasses JNI call for the interaction between Java runtime
> application and its native code.
> * Provides an allocation aware auto-reclaim mechanism to prevent
> external memory resource leaking.
> === Background ===
> Big Data and Cloud applications increasingly require both high
> throughput and low latency processing. Java-based applications
> targeting the Big Data and Cloud space should be tuned for better
> throughput, lower latency, and more predictable response time.
> Typically, there are some issues that impact BigData applications'
> performance and scalability:
> 1) The Complexity of Data Transformation/Organization: In most cases,
> during data processing, applications use their own complicated data
> caching mechanism for SerDes data objects, spilling to different
> storage and eviction large amount of data. Some data objects contains
> complex values and structure that will make it much more difficulty
> for data organization. To load and then parse/decode its datasets from
> storage consumes high system resource and computation power.
> 2) Lack of Caching, Burst Temporary Object Creation/Destruction Causes
> Frequent Long GC Pauses: Big Data computing/syntax generates large
> amount of temporary objects during processing, e.g. lambda, SerDes,
> copying and etc. This will trigger frequent long Java GC pause to scan
> references, to update references lists, and to copy live objects from
> one memory location to another blindly.
> 3) The Unpredictable GC Pause: For latency sensitive applications,
> such as database, search engine, web query, real-time/streaming
> computing, require latency/request-response under control. But current
> Java GC does not provide predictable GC activities with large on-heap
> memory management.
> 4) High JNI Invocation Cost: JNI calls are expensive, but high
> performance applications usually try to leverage native code to
> improve performance, however, JNI calls need to convert Java objects
> into something that C/C++ can understand. In addition, some
> comprehensive native code needs to communicate with Java based
> application that will cause frequently JNI call along with stack
> marshalling.
> Mnemonic project provides a solution to address above issues and
> performance bottlenecks for structured data processing and computing.
> It also simplifies the massive data handling with much reduced GC
> activity.
> === Rationale ===
> There are strong needs for a cohesive, easy-to-use non-volatile
> programing model for unified heterogeneous memory resources management
> and allocation. Mnemonic project provides a reusable and flexible
> framework to accommodate other special type of memory/block devices
> for better performance without changing client code.
> Most of the BigData frameworks (e.g., Apache Spark™, Apache™ Hadoop®,
> Apache HBase™, Apache Flink™, Apache Kafka™, etc.) have their own
> complicated memory management modules for caching and checkpoint. Many
> approaches increase the complexity and are error-prone to maintain
> code.
> We have observed heavy overheads during the operations of data parse,
> SerDes, pack/unpack, code/decode for data loading, storage,
> checkpoint, caching, marshal and transferring. Mnemonic provides a
> generic in-memory persistence object model to address those overheads
> for better performance. In addition, it manages its in-memory
> persistence objects and blocks in the way that GC does, which means
> their underlying memory resource is able to be reclaimed without
> explicitly releasing it.
> Some existing Big Data applications suffer from poor Java GC behaviors
> when they process their massive unstructured datasets.  Those
> behaviors either cause very long stop-the-world GC pauses or take
> significant system resources during computing which impact throughput
> and incur significant perceivable pauses for interactive analytics.
> There are more and more computing intensive Big Data applications
> moving down to rely on JNI to offload their computing tasks to native
> code which dramatically increases the cost of JNI invocation and IPC.
> Mnemonic provides a mechanism to communicate with native code directly
> through in-place object data update to avoid complex object data type
> conversion and stack marshaling. In addition, this project can be
> extended to support various lockers for threads between Java code and
> native code.
> === Initial Goals ===
> Our initial goal is to bring Mnemonic into the ASF and transit the
> engineering and governance processes to the "Apache Way."  We would
> like to enrich a collaborative development model that closely aligns
> with current and future industry memory and storage technologies.
> Another important goal is to encourage efforts to integrate
> non-volatile programming model into data centric processing/analytics
> frameworks/applications, (e.g., Apache Spark™, Apache HBase™, Apache
> Flink™, Apache™ Hadoop®, Apache Cassandra™,  etc.).
> We expect Mnemonic project to be continuously developing new
> functionalities in an open, community-driven way. We envision
> accelerating innovation under ASF governance in order to meet the
> requirements of a wide variety of use cases for in-memory non-volatile
> and volatile data caching programming.
> === Current Status ===
> Mnemonic project is available at Intel’s internal repository and
> managed by its designers and developers. It is also temporary hosted
> at Github for general view
> We have integrated this project for Apache Spark™ 1.5.0 and get 2X
> performance improvement ratio for Spark™ MLlib k-means workload and
> observed expected benefits of removing SerDes, reducing total GC pause
> time by 40% from our experiments.
> ==== Meritocracy ====
> Mnemonic was originally created by Gang (Gary) Wang and Yanping Wang
> in early 2015. The initial committers are the current Mnemonic R&D
> team members from US, China, and India Big Data Technologies Group at
> Intel. This group will form a base for much broader community to
> collaborate on this code base.
> We intend to radically expand the initial developer and user community
> by running the project in accordance with the "Apache Way." Users and
> new contributors will be treated with respect and welcomed. By
> participating in the community and providing quality patches/support
> that move the project forward, they will earn merit. They also will be
> encouraged to provide non-code contributions (documentation, events,
> community management, etc.) and will gain merit for doing so. Those
> with a proven support and quality track record will be encouraged to
> become committers.
> ==== Community ====
> If Mnemonic is accepted for incubation, the primary initial goal is to
> transit the core community towards embracing the Apache Way of project
> governance. We would solicit major existing contributors to become
> committers on the project from the start.
> ==== Core Developers ====
> Mnemonic core developers are all skilled software developers and
> system performance engineers at Intel Corp with years of experiences
> in their fields. They have contributed many code to Apache projects.
> There are PMCs and experienced committers have been working with us
> from Apache Spark™, Apache HBase™, Apache Phoenix™, Apache™ Hadoop®
> for this project's open source efforts.
> === Alignment ===
> The initial code base is targeted to data centric processing and
> analyzing in general. Mnemonic has been building the connection and
> integration for Apache projects and other projects.
> We believe Mnemonic will be evolved to become a promising project for
> real-time processing, in-memory streaming analytics and more, along
> with current and future new server platforms with persistent memory as
> base storage devices.
> === Known Risks ===
> ==== Orphaned products ====
> Intel’s Big Data Technologies Group is actively working with community
> on integrating this project to Big Data frameworks and applications.
> We are continuously adding new concepts and codes to this project and
> support new usage cases and features for Apache Big Data ecosystem.
> The project contributors are leading contributors of Hadoop-based
> technologies and have a long standing in the Hadoop community. As we
> are addressing major Big Data processing performance issues, there is
> minimal risk of this work becoming non-strategic and unsupported.
> Our contributors are confident that a larger community will be formed
> within the project in a relatively short period of time.
> ==== Inexperience with Open Source ====
> This project has long standing experienced mentors and interested
> contributors from Apache Spark™, Apache HBase™, Apache Phoenix™,
> Apache™ Hadoop® to help us moving through open source process. We are
> actively working with experienced Apache community PMCs and committers
> to improve our project and further testing.
> ==== Homogeneous Developers ====
> All initial committers and interested contributors are employed at
> Intel. As an infrastructure memory project, there are wide range of
> Apache projects are interested in innovative memory project to fit
> large sized persistent memory and storage devices. Various Apache
> projects such as Apache Spark™, Apache HBase™, Apache Phoenix™, Apache
> Flink™, Apache Cassandra™ etc. can take good advantage of this project
> to overcome serialization/de-serialization, Java GC, and caching
> issues. We expect a wide range of interest will be generated after we
> open source this project to Apache.
> ==== Reliance on Salaried Developers ====
> All developers are paid by their employers to contribute to this
> project. We welcome all others to contribute to this project after it
> is open sourced.
> ==== Relationships with Other Apache Product ====
> Relationship with Apache™ Arrow:
> Arrow's columnar data layout allows great use of CPU caches & SIMD. It
> places all data that relevant to a column operation in a compact
> format in memory.
> Mnemonic directly puts the whole business object graphs on external
> heterogeneous storage media, e.g. off-heap, SSD. It is not necessary
> to normalize the structures of object graphs for caching, checkpoint
> or storing. It doesn’t require developers to normalize their data
> object graphs. Mnemonic applications can avoid indexing & join
> datasets compared to traditional approaches.
> Mnemonic can leverage Arrow to transparently re-layout qualified data
> objects or create special containers that is able to efficiently hold
> those data records in columnar form as one of major performance
> optimization constructs.
> Mnemonic can be integrated into various Big Data and Cloud frameworks
> and applications.
> We are currently working on several Apache projects with Mnemonic:
> For Apache Spark™ we are integrating Mnemonic to improve:
> a) Local checkpoints
> b) Memory management for caching
> c) Persistent memory datasets input
> d) Non-Volatile RDD operations
> The best use case for Apache Spark™ computing is that the input data
> is stored in form of Mnemonic native storage to avoid caching its row
> data for iterative processing. Moreover, Spark applications can
> leverage Mnemonic to perform data transforming in persistent or
> non-persistent memory without SerDes.
> For Apache™ Hadoop®, we are integrating HDFS Caching with Mnemonic
> instead of mmap. This will take advantage of persistent memory related
> features. We also plan to evaluate to integrate in Namenode Editlog,
> FSImage persistent data into Mnemonic persistent memory area.
> For Apache HBase™, we are using Mnemonic for BucketCache and
> evaluating performance improvements.
> We expect Mnemonic will be further developed and integrated into many
> Apache BigData projects and so on, to enhance memory management
> solutions for much improved performance and reliability.
> ==== An Excessive Fascination with the Apache Brand ====
> While we expect Apache brand helps to attract more contributors, our
> interests in starting this project is based on the factors mentioned
> in the Rationale section.
> We would like Mnemonic to become an Apache project to further foster a
> healthy community of contributors and consumers in BigData technology
> R&D areas. Since Mnemonic can directly benefit many Apache projects
> and solves major performance problems, we expect the Apache Software
> Foundation to increase interaction with the larger community as well.
> === Documentation ===
> The documentation is currently available at Intel and will be posted
> under:
> === Initial Source ===
> Initial source code is temporary hosted Github for general viewing:
> It will be moved to Apache after podling.
> The initial Source is written in Java code (88%) and mixed with JNI C
> code (11%) and shell script (1%) for underlying native allocation
> libraries.
> === Source and Intellectual Property Submission Plan ===
> As soon as Mnemonic is approved to join the Incubator, the source code
> will be transitioned via the Software Grant Agreement onto ASF
> infrastructure and in turn made available under the Apache License,
> version 2.0.
> === External Dependencies ===
> The required external dependencies are all Apache licenses or other
> compatible Licenses
> Note: The runtime dependent licenses of Mnemonic are all declared as
> Apache 2.0, the GNU licensed components are used for Mnemonic build
> and deployment. The Mnemonic JNI libraries are built using the GNU
> tools.
> maven and its plugins ( ) [Apache 2.0]
> JDK8 or OpenJDK 8 ( [Oracle or Openjdk JDK License]
> Nvml ( ) [optional] [Open Source]
> PMalloc ( ) [optional] [Apache 2.0]
> Build and test dependencies:
> org.testng.testng v6.8.17  ( [Apache 2.0]
> org.flowcomputing.commons.commons-resgc v0.8.7 [Apache 2.0]
> org.flowcomputing.commons.commons-primitives v.0.6.0 [Apache 2.0]
> com.squareup.javapoet v1.3.1-SNAPSHOT [Apache 2.0]
> JDK8 or OpenJDK 8 ( [Oracle or Openjdk JDK License]
> === Cryptography ===
> Project Mnemonic does not use cryptography itself, however, Hadoop
> projects use standard APIs and tools for SSH and SSL communication
> where necessary.
> === Required Resources ===
> We request that following resources be created for the project to use
> ==== Mailing lists ====
> (moderated subscriptions)
> ==== Git repository ====
> ==== Documentation ====
> ==== JIRA instance ====
> === Initial Committers ===
> * Gang (Gary) Wang (gang1 dot wang at intel dot com)
> * Yanping Wang (yanping dot wang at intel dot com)
> * Uma Maheswara Rao G (umamahesh at apache dot org)
> * Kai Zheng (drankye at apache dot org)
> * Rakesh Radhakrishnan Potty  (rakeshr at apache dot org)
> * Sean Zhong  (seanzhong at apache dot org)
> * Henry Saputra  (hsaputra at apache dot org)
> * Hao Cheng (hao dot cheng at intel dot com)
> === Additional Interested Contributors ===
> * Debo Dutta (dedutta at cisco dot com)
> * Liang Chen (chenliang613 at Huawei dot com)
> === Affiliations ===
> * Gang (Gary) Wang, Intel
> * Yanping Wang, Intel
> * Uma Maheswara Rao G, Intel
> * Kai Zheng, Intel
> * Rakesh Radhakrishnan Potty, Intel
> * Sean Zhong, Intel
> * Henry Saputra, Independent
> * Hao Cheng, Intel
> === Sponsors ===
> ==== Champion ====
> Patrick Hunt
> ==== Nominated Mentors ====
> * Patrick Hunt <phunt at apache dot org> - Apache IPMC member
> * Andrew Purtell <apurtell at apache dot org > - Apache IPMC member
> * James Taylor <jamestaylor at apache dot org> - Apache IPMC member
> * Henry Saputra <hsaputra at apache dot org> - Apache IPMC member
> ==== Sponsoring Entity ====
> Apache Incubator PMC
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