incubator-cvs mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Apache Wiki <>
Subject [Incubator Wiki] Update of "IcebergProposal" by RyanBlue
Date Mon, 12 Nov 2018 19:48:57 GMT
Dear Wiki user,

You have subscribed to a wiki page or wiki category on "Incubator Wiki" for change notification.

The "IcebergProposal" page has been changed by RyanBlue:

New page:
= Iceberg Proposal =

== Abstract ==
Iceberg is a table format for large, slow-moving tabular data.

It is designed to improve on the de-facto standard table layout built into Apache Hive, Presto,
and Apache Spark.

== Proposal ==
The purpose of Iceberg is to provide SQL-like tables that are backed by large sets of data
files. Iceberg is similar to the Hive table layout, the de-facto standard structure used to
track files in a table, but provides additional guarantees and performance optimizations:

 * Atomicity - Each change to the table is will be complete or will fail. “Do or do not.
There is no try.”
 * Snapshot isolation - Reads use one and only one snapshot of a table at some time without
holding a lock.
 * Safe schema evolution - A table’s schema can change in well-defined ways, without breaking
older data files.
 * Column projection - An engine may request a subset of the available columns, including
nested fields.
 * Predicate pushdown - An engine can push filters into read planning to improve performance
using partition data and file-level statistics.

Iceberg does NOT define a new file format. All data is stored in Apache Avro, Apache ORC,
or Apache Parquet files.

Additionally, Iceberg is designed to work well when data files are stored in cloud blob stores,
even when those systems provide weaker guarantees than a file system, including:

 * Eventual consistency in the namespace
 * High latency for directory listings
 * No renames of objects
 * No folder hierarchy

== Rationale ==
Initial benchmarks show dramatic improvements in query planning. For example, in Netflix’s
Atlas use case, which stores time-series metrics from Netflix runtime systems and 1 month
is stored across 2.7 million files in 2,688 partitions:
 * Hive table using Parquet:
   * 400k+ splits, not combined
   * Explain query: 9.6 minutes wall time (planning only)
 * Iceberg table with partition filtering:
   * 15,218 splits, combined
   * Planning: 10 seconds
   * Query wall time: 13 minutes
 * Iceberg table with partition and min/max filtering:
   * 412 splits
   * Planning: 25 seconds
   * Query wall time: 42 seconds

These performance gains combined with the cross-engine compatibility are a very compelling

== Initial Goals ==
The initial goal will be to move the existing codebase to Apache and integrate with the Apache
development process and infrastructure. A primary goal of incubation will be to grow and diversify
the Iceberg community. We are well aware that the project community is largely comprised of
individuals from a single company. We aim to change that during incubation.

== Current Status ==
As previously mentioned, Iceberg is under active development at Netflix, and is being used
in processing large volumes of data in Amazon EC2.

Iceberg license documentation is already based on Apache guidelines for LICENSE and NOTICE

=== Meritocracy ===
We value meritocracy and we understand that it is the basis for an open community that encourages
multiple companies and individuals to contribute and be invested in the project’s future.
We will encourage and monitor participation and make sure to extend privileges and responsibilities
to all contributors.

=== Community ===
Iceberg is currently being used by developers at Netflix and a growing number of users are
actively using it in production environments. Iceberg has received contributions from developers
working at Hortonworks, WeWork, and Palantir. By bringing Iceberg to Apache we aim to assure
current and future contributors that the Iceberg community is meritocratic and open, in order
to broaden and diversity the user and developer community.

=== Core Developers ===
Iceberg was initially developed at Netflix and is under active development. We believe Netflix
will be of interest to a broad range of users and developers and that incubating the project
at the ASF will help us build a diverse, sustainable community.

=== Alignment ===
Iceberg utilizes other Apache projects such as Avro, Hadoop, Hive, ORC, Parquet, Pig, and
Spark. We anticipate integration with additional Apache projects as the Iceberg community
and interest in the project grows.

== Known Risks ==

=== Orphaned Products ===
Netflix  is committed to the future development of Iceberg and understands that graduation
to a TLP, while preferable, is not the only positive outcome of incubation.

Should the Iceberg project be accepted by the Incubator, the prospective PPMC would be willing
to agree to a target incubation period of 2 years or less, knowing that every Incubator project
incurs a certain cost in terms of ASF infrastructure and volunteer time.

=== Inexperience with Open Source ===
Three of the initial committers are Apache members and Incubator PMC members. They will work
with the other community members to teach them the Apache Way.

=== Homogenous Developers ===
The majority of the committers work at Netflix, though we are committed to recruiting and
developing additional committers from a wide spectrum of industries and backgrounds.

=== Reliance on Salaried Developers ===
It is expected that Iceberg development will occur on both salaried time and on volunteer
time, after hours. Most of the initial committers are paid by Netflix to contribute to this
project. However, they are all passionate about the project, and we are both confident and
hopeful that the project will continue even if no salaried developers contribute to the project.

=== Relationships with Other Apache Products ===
As mentioned in the Rationale section, Iceberg utilizes a number of existing Apache projects
(Avro, Hadoop, Hive, ORC, Parquet, Pig, & Spark), and we expect that list to expand as
the community grows and diversifies. Any Apache project in the big data space that needs to
store or process tabular data would be potentially relevant.

=== An Excessive Fascination with the Apache Brand ===
We are applying to the Incubator process because we think it is the next logical step for
the Iceberg project after open-sourcing the code. This proposal is not for the purpose of
generating publicity. Rather, we want to make sure to create a very inclusive and meritocratic
community, outside the umbrella of a single company. Netflix has a long history of contributing
to Apache projects and the Iceberg developers and contributors understand the implication
of making it an Apache project.

== Required Resources ==

=== Mailing lists ===


The podling may also create a user mailing list, if needed.

=== Source Control and Issue Tracking ===
The Iceberg podling would use Apache’s gitbox integration to sync between github and Apache
infrastructure. The podling would use github issues and pull requests for community engagement.

== Current Resources ==

 * Initial source:
 * Java documentation:
 * Table specification:

== Source and Intellectual Property Submission Plan ==
The Iceberg  source code in Github is currently licensed under Apache License v2.0 and the
copyright is assigned to Netflix. If Iceberg becomes an Incubator project at the ASF, Netflix
will transfer the source code and trademark ownership to the Apache Software Foundation via
a Software Grant Agreement.

== External Dependencies ==
External dependencies licensed under Apache License 2.0
 * Guava
 * Jackson
 * Joda-Time

External dependencies licensed under the MIT License
 * SLF4J
 * Mockito

ASF Projects
 * Apache Avro
 * Apache Hadoop
 * Apache Hive
 * Apache ORC
 * Apache Parquet
 * Apache Pig
 * Apache Spark

== Cryptography ==
We do not expect Iceberg to be a controlled export item due to the use of encryption.

== Initial Committers ==

 * Ryan Blue
 * Parth Brahmbhatt
 * Julien Le Dem
 * Owen O’Malley
 * Daniel Weeks

== Affiliations ==

 * Aniket Mokashi - Twitter
 * Brock Noland - Cloudera
 * Chris Aniszczyk - Twitter
 * Dmitriy Ryaboy - Twitter
 * Jake Farrell
 * Jonathan Coveney - Twitter
 * Julien Le Dem - Twitter
 * Lukas Nalezenec - Seznam
 * Marcel Kornacker - Cloudera
 * Mickael Lacour - Criteo
 * Nong Li - Cloudera
 * Remy Pecqueur - Criteo
 * Ryan Blue - Cloudera
 * Tianshuo Deng - Twitter
 * Tom White - Cloudera
 * Wesley Peck - ARRIS Enterprises, Inc.

== Sponsors and Nominated Mentors ==

 * Champion and mentor: Owen O’Malley
 * Mentor: Ryan Blue
 * Mentor: Julien Le Dem

=== Sponsoring Entity ===

The Apache Incubator

To unsubscribe, e-mail:
For additional commands, e-mail:

View raw message