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OpenHFT

12 indexed repositories · View on GitHub

Chronicle-Queue
Micro second messaging that stores everything to disk

Java · 3815 stars
Chronicle-Map
Replicate your Key Value Store across your network, with consistency, persistance and performance.

Java · 2990 stars
Java-Thread-Affinity
Bind a java thread to a given core

Java · 1898 stars
Zero-Allocation-Hashing
Zero-allocation hashing for Java

Java · 845 stars
Java-Runtime-Compiler
Java Runtime Compiler

Java · 708 stars
Chronicle-Core
Low level access to native memory, JVM and OS.

Java · 641 stars
Chronicle-Wire
A Low Garbage Java Serialisation Library that supports multiple formats

Java · 602 stars
Chronicle-Bytes
Chronicle Bytes has a similar purpose to Java NIO's ByteBuffer with many extensions

Java · 437 stars
Chronicle-Threads

Java · 196 stars
Chronicle-Values

Java · 115 stars
JLBH
JLBH

Java · 89 stars
Chronicle-Test-Framework

Java · 29 stars

Beginner friendly Everything

Open All

CORE-65: Track small-double precision loss in Wire 2.26.17 Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

OpenHFT/Chronicle-Wire#1294 · Opened Sep 19, 2026
Design a complete post-Unsafe memory-access architecture Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

OpenHFT/Zero-Allocation-Hashing#124 · Opened Aug 21, 2026
Antora guide: navigation, bookmarks and readability improvements (2025 feedback) Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

OpenHFT/Chronicle-Queue#1733 · Opened Aug 20, 2026
Potential Vulnerabilities Due To Hidden Dependencies Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenHFT/Chronicle-Map#609 · Opened Aug 11, 2026
Please provide a private channel for vulnerability disclosure Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

OpenHFT/Chronicle-Wire#1263 · 2 comments · Opened Jun 12, 2026
Preload `org.jetbrains.annotations.{NotNull,Nullable}` in MyJavaFileManager Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

OpenHFT/Chronicle-Values#177 · Opened Jun 4, 2026
LinuxHelper.sched_getcpu() uses wrong syscall number: 318 (getrandom) instead of 309 (getcpu) on x86_64 Open

Difficulty 1/5 Under an hour Newbie friendliness 68/100

OpenHFT/Java-Thread-Affinity#203 · 1 comment · Opened May 5, 2026
Reduce excessive linear scans in lastIndex() hot path Open

OpenHFT/Chronicle-Queue#1704 · 1 assignee · Opened Apr 30, 2026
UnsupportedOperationException: Read only when calling createTailer(String) Open

OpenHFT/Chronicle-Queue#1703 · 1 comment · 1 assignee · Opened Apr 15, 2026
Not compatible with Java 17? Open

OpenHFT/Chronicle-Map#579 · 1 comment · 1 assignee · Opened Aug 21, 2025
Document releases Open

OpenHFT/Java-Thread-Affinity#186 · 1 assignee · Opened Jul 23, 2025
Benchmark units Open

Difficulty 2/5 1-3 hours Newbie friendliness 42/100

OpenHFT/Chronicle-Map#576 · Opened Jul 15, 2025
[JDK-8361426] JDK26+ incompatibility because of jdk.internal.ref.Cleaner removal. Open

Difficulty 3/5 1-2 days Newbie friendliness 55/100

OpenHFT/Chronicle-Map#575 · 5 comments · 2 reactions · Opened Jul 9, 2025
springboot3.4.3 && java17 Open

Difficulty 5/5 Over a week Newbie friendliness 15/100

OpenHFT/Chronicle-Map#574 · Opened Jul 8, 2025
Control tracking of non cleaning threads via system property Open

OpenHFT/Chronicle-Threads#273 · 1 reaction · 1 assignee · Opened May 7, 2025
Using method writer in a spring boot application Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

OpenHFT/Chronicle-Wire#995 · 2 comments · Opened Apr 8, 2025
Any plan to remove `Unsafe` usage ? Open

Difficulty 5/5 Over a week Newbie friendliness 30/100

OpenHFT/Zero-Allocation-Hashing#94 · 6 comments · 11 reactions · Opened Mar 19, 2025
SizeMarshaller is it aliased? Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenHFT/Chronicle-Map#572 · Opened Mar 14, 2025
Very old package jnr-a64asm beig used in Chronicle Map Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

OpenHFT/Chronicle-Map#571 · Opened Feb 13, 2025
ConcurrentModificationException while calling put method on persisted map Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenHFT/Chronicle-Map#570 · Opened Feb 13, 2025
Beneficial to use jdk.incubator.vector? Open

Difficulty 5/5 Over a week Newbie friendliness 25/100

OpenHFT/Zero-Allocation-Hashing#93 · Opened Feb 6, 2025
How to startup benchmark Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

OpenHFT/Chronicle-Map#567 · Opened Dec 24, 2024
selecting performance or other cores code from GPT Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

OpenHFT/Java-Thread-Affinity#137 · Opened Dec 6, 2024
allow to pass xstream converters to putAll() Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

OpenHFT/Chronicle-Map#565 · Opened Nov 13, 2024
YAML list state (trailing commas) seeps into next parsed object Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

OpenHFT/Chronicle-Wire#943 · 1 comment · Opened Oct 3, 2024
Fix: JsonWire fails to decode SelfDescribingMarshallable nested inside AbstractMarshallableCfg Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

OpenHFT/Chronicle-Wire#942 · Opened Oct 2, 2024
Fix: Yaml Wire fails to unmarshall generic field Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

OpenHFT/Chronicle-Wire#938 · Opened Sep 26, 2024
Chronicle-Map Lock Contention Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenHFT/Chronicle-Map#556 · 2 comments · Opened Aug 30, 2024
At least some sequence() overloads fail to properly deserialize nested JSON with types Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

OpenHFT/Chronicle-Wire#925 · Opened Jul 17, 2024
Shouldn't fail fast if trying to open a queue in read only mode, allow a short timeout Open

OpenHFT/Chronicle-Queue#1592 · 1 assignee · Opened Jun 28, 2024
JSONWire fails to skip ignored object when a typed abstract class is skipped Open

Difficulty 4/5 3-5 days Newbie friendliness 20/100

OpenHFT/Chronicle-Wire#912 · 1 comment · Opened Jun 24, 2024
Class unloading issue Open

Difficulty 3/5 1-2 days Newbie friendliness 25/100

OpenHFT/Java-Runtime-Compiler#136 · Opened Jun 10, 2024
examples in documentation need to be updated to latest version of code Open

Difficulty 2/5 1-3 hours Newbie friendliness 50/100

OpenHFT/Chronicle-Wire#892 · Opened May 10, 2024
SelfDescribingTriviallyCopyable fails on Mac with Java17 or newer Open

OpenHFT/Chronicle-Wire#891 · 1 assignee · Opened May 2, 2024
Fix MessageHistoryTest to run with history.as.bytes=true on mac Open

OpenHFT/Chronicle-Wire#881 · 1 assignee · Opened Apr 19, 2024
Investigate unsafe reuse of StringBuilder in YamlWireOut Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenHFT/Chronicle-Wire#879 · Opened Apr 19, 2024
What's the point of the cores check below? And how to deal with big.LITTLE CPUs? Open

OpenHFT/Java-Thread-Affinity#119 · 1 comment · 1 assignee · Opened Apr 18, 2024
Antora configuration update Open

OpenHFT/Chronicle-Queue#1559 · 1 assignee · Opened Apr 12, 2024
Map is super fragile wrt estimated sizes Open

review

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenHFT/Chronicle-Map#533 · 1 comment · Opened Apr 12, 2024
setAffinity does not work as expected in Windows Open

OpenHFT/Java-Thread-Affinity#117 · 8 comments · 1 assignee · Opened Apr 5, 2024
Problem with gradle en eclipse because of automatic modules Open

review

OpenHFT/Java-Runtime-Compiler#130 · 2 comments · 1 assignee · Opened Mar 28, 2024
Support non contiguous processor ids Open

OpenHFT/Java-Thread-Affinity#115 · 1 comment · 1 assignee · Opened Mar 6, 2024
Catch Throwable instead of Exception Open

graalvm

OpenHFT/Chronicle-Core#634 · 6 comments · 1 assignee · Opened Mar 5, 2024
skipFirst only affects calculation of variance. It should also drop the 1st run's results Open

Difficulty 3/5 1-2 days Newbie friendliness 35/100

OpenHFT/JLBH#59 · Opened Feb 6, 2024
can you support for cityhash 1.0.3 Open

Difficulty 3/5 1-2 days Newbie friendliness 28/100

OpenHFT/Zero-Allocation-Hashing#87 · 1 comment · Opened Jan 29, 2024
solving tools.jar dependency while migrating to JRE 11 Open

review

OpenHFT/Chronicle-Map#506 · 1 comment · 1 assignee · Opened Jan 15, 2024
can you implement balloon hash and argon ? Open

Difficulty 5/5 Over a week Newbie friendliness 20/100

OpenHFT/Zero-Allocation-Hashing#85 · 1 comment · Opened Dec 31, 2023
"Failed to acquire the lock" Exception Open

Difficulty 4/5 3-5 days Newbie friendliness 42/100

OpenHFT/Chronicle-Map#505 · 7 comments · Opened Dec 14, 2023
Read-only Tailer cannot read existing queue if some segments were removed/archived Open

review

Difficulty 4/5 3-5 days Newbie friendliness 35/100

OpenHFT/Chronicle-Queue#1480 · 1 comment · Opened Dec 4, 2023
How to correctly calculate hash for byte[][]? Open

review

Difficulty 5/5 Over a week Newbie friendliness 25/100

OpenHFT/Zero-Allocation-Hashing#83 · Opened Nov 15, 2023

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