|author||Sijie Guo <email@example.com>||Tue Oct 24 19:56:42 2017 +0800|
|committer||Jia Zhai <firstname.lastname@example.org>||Tue Oct 24 19:56:42 2017 +0800|
ISSUE #226: ByteBuf.release() was not called before it's garbage-collected Descriptions of the changes in this PR: the problem is a new entry buffer was allocated when closing log segment writer. the entry buffer is never used and also never recycled. It causes an annoying logging. the fix is to assign a dummy entry writer which basically rejects writes, when closing a log segment writer. it would prevent leaking bytebuf. Author: Sijie Guo <email@example.com> Reviewers: Jia Zhai <None> This closes #230 from sijie/fix_bytebuf_release_pr, closes #226
Apache DistributedLog (DL) is a high-throughput, low-latency replicated log service, offering durability, replication and strong consistency as essentials for building reliable real-time applications.
Apache DistributedLog project graduated from Incubator at July 2017. It is now a sub-project of Apache BookKeeper.
DL is able to provide milliseconds latency on durable writes with a large number of concurrent logs, and handle high volume reads and writes per second from thousands of clients.
Messages are persisted on disk and replicated to store multiple copies to prevent data loss. They are guaranteed to be consistent among writers and readers in terms of strict ordering.
DL provides an efficient service layer that is optimized for running in a multi- tenant datacenter environment such as Mesos or Yarn. The service layer is able to support large scale writes (fan-in) and reads (fan-out).
DL supports various workloads from latency-sensitive online transaction processing (OLTP) applications (e.g. WAL for distributed database and in-memory replicated state machines), real-time stream ingestion and computing, to analytical processing.
To support a large number of logs for multi-tenants, DL is designed for I/O isolation in real-world workloads.
DL has a modern layered architecture design, which separates the stateless service tier from the stateful storage tier. To support large scale writes (fan- in) and reads (fan-out), DL allows scaling storage independent of scaling CPU and memory.
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Apache DistributedLog is an open source project of The Apache Software Foundation (ASF). The Apache DistributedLog project originated from Twitter.