FlexyPool
MapDB
FlexyPool | MapDB | |
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2 | 5 | |
1,048 | 4,834 | |
- | - | |
0.0 | 0.0 | |
3 months ago | 4 months ago | |
Java | Java | |
Apache License 2.0 | Apache License 2.0 |
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FlexyPool
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Scalable Sequence for PostgreSQL
However, PostgreSQL caches the sequences per-connection (different from Oracle that caches in the instance shared memory). Sequences can be a bottleneck in case of a storm where all have a cold cache, and here is a workaround. Note that re-connecting in PostgreSQL is expensive for many reasons and better fixt that with a connection pool that is not too dynamic (if you need this, you should have a look at FlexiPool)
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Do you have a github account ? What are you working on as a Java side-project ?
FlexyPool
MapDB
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GC, hands off my data!
I decided to start with an overview of what open-source options are currently available. When it comes to the implementation of the on-heap cache mechanism, the options are numerous – there is well known: guava, ehcache, caffeine and many other solutions. However, when I began researching cache mechanisms offering the possibility of storing data outside GC control, I found out that there are very few solutions left. Out of the popular ones, only Terracotta is supported. It seems that this is a very niche solution and we do not have many options to choose from. In terms of less-known projects, I came across Chronicle-Map, MapDB and OHC. I chose the last one because it was created as part of the Cassandra project, which I had some experience with and was curious about how this component worked:
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Permazen: Language-natural persistence to KV stores
So, it's an object database, like Zope's ZODB on Python?
I like the idea, but I'd like to learn about use cases for it.
Otherwise, in Java, MapDB is about as far as I'd be willing to go: https://github.com/jankotek/mapdb/
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what is the best persistent collection library?
Anyway, without further ado, I found MapDB (https://github.com/jankotek/mapdb) which does exactly that. Of course, they also provide their own Java collection implementations as well, so I suspect using it with Vavr would be a poor idea, but it is very cool in its own right anyway. Of course, there is also Apache Derby and HSQLDB, and those great options with a long history as well. I haven't played with these in a while though, so I might give them a try again soon for some personal stuff.
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Ask HN: What are the best key-value self-hosted storage engines?
In Java I like
https://mapdb.org/
It is more feature rich than you want but in Python I'd probably just use sqlite3 since it is in the standard library.
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Solution for hash-map with >100M values
I have had good results with mapdb
What are some alternatives?
HikariCP - 光 HikariCP・A solid, high-performance, JDBC connection pool at last.
Chronicle Map - Replicate your Key Value Store across your network, with consistency, persistance and performance.
Vibur DBCP - Vibur DBCP - concurrent and dynamic JDBC connection pool
H2 - H2 is an embeddable RDBMS written in Java.
Apache Phoenix - Apache Phoenix
JetBrains Xodus - Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.
Crate - CrateDB is a distributed and scalable SQL database for storing and analyzing massive amounts of data in near real-time, even with complex queries. It is PostgreSQL-compatible, and based on Lucene.
Redisson - Redisson - Easy Redis Java client and Real-Time Data Platform. Sync/Async/RxJava/Reactive API. Over 50 Redis based Java objects and services: Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Spring Cache, Tomcat, Scheduler, JCache API, Hibernate, RPC, local cache ...
Apache Hive - Apache Hive
Jedis - Redis Java client
jOOQ - jOOQ is the best way to write SQL in Java
Exposed - Kotlin SQL Framework