doc/source/introduction.rst - incubator-crail - Git at Google

 .. Licensed under the Apache License, Version 2.0 (the "License"); you may not
 .. use this file except in compliance with the License. You may obtain a copy of
 .. the License at
 ..
 ..   http://www.apache.org/licenses/LICENSE-2.0
 ..
 .. Unless required by applicable law or agreed to in writing, software
 .. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 .. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 .. License for the specific language governing permissions and limitations under
 .. the License.

 Introduction
 ============


 Apache Crail (Incubating) is a fast multi-tiered distributed storage system designed from ground up for high-performance network and storage hardware. The unique features of Crail include:

 * Zero-copy network access from userspace
 * Integration of multiple storage tiers such DRAM, flash and disaggregated shared storage
 * Ultra-low latencies for both meta data and data operations. For instance: opening, reading and closing a small file residing in the distributed DRAM tier less than 10 microseconds, which is in the same ballpark as some of the fastest RDMA-based key/value stores
 * High-performance sequential read/write operations: For instance: read operations on large files residing in the distributed DRAM tier are typically limited only by the performance of the network
 * Very low CPU consumption: a single core sharing both application and file system client can drive sequential read/write operations at the speed of up to 100Gbps and more
 * Asynchronous API leveraging the asynchronous nature of RDMA-based networking hardware
 * Extensible plugin architecture: new storage tiers tailored to specific hardware can be added easily

 Crail is implemented in Java offering a Java API which integrates directly with the Java off-heap memory. Crail is designed for performance critical temporary data within a scope of a rack or two.
	.. Licensed under the Apache License, Version 2.0 (the "License"); you may not
	.. use this file except in compliance with the License. You may obtain a copy of
	.. the License at
	..
	.. http://www.apache.org/licenses/LICENSE-2.0
	..
	.. Unless required by applicable law or agreed to in writing, software
	.. distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	.. WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
	.. License for the specific language governing permissions and limitations under
	.. the License.

	Introduction
	============


	Apache Crail (Incubating) is a fast multi-tiered distributed storage system designed from ground up for high-performance network and storage hardware. The unique features of Crail include:

	* Zero-copy network access from userspace
	* Integration of multiple storage tiers such DRAM, flash and disaggregated shared storage
	* Ultra-low latencies for both meta data and data operations. For instance: opening, reading and closing a small file residing in the distributed DRAM tier less than 10 microseconds, which is in the same ballpark as some of the fastest RDMA-based key/value stores
	* High-performance sequential read/write operations: For instance: read operations on large files residing in the distributed DRAM tier are typically limited only by the performance of the network
	* Very low CPU consumption: a single core sharing both application and file system client can drive sequential read/write operations at the speed of up to 100Gbps and more
	* Asynchronous API leveraging the asynchronous nature of RDMA-based networking hardware
	* Extensible plugin architecture: new storage tiers tailored to specific hardware can be added easily

	Crail is implemented in Java offering a Java API which integrates directly with the Java off-heap memory. Crail is designed for performance critical temporary data within a scope of a rack or two.