dineshchitlangia commented on a change in pull request #764: HDDS-2294. Create a new HISTORY.md in the new repository. URL: https://github.com/apache/hadoop-ozone/pull/764#discussion_r406524101
########## File path: HISTORY.md ########## @@ -0,0 +1,61 @@ +<!--- + Licensed to the Apache Software Foundation (ASF) under one or more + contributor license agreements. See the NOTICE file distributed with + this work for additional information regarding copyright ownership. + The ASF licenses this file to You 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. +--> + +# History of Apache Hadoop Ozone project + +Ozone development was started on a feature branch HDFS-7240 as part of the Apache Hadoop HDFS project. Based on the Jira information the first Ozone commit was the commit of [HDFS-8456 Ozone: Introduce STORAGE_CONTAINER_SERVICE as a new NodeType.](https://issues.apache.org/jira/browse/HDFS-8456) in May 2015. + + +Ozone is an Object Store for Hadoop which is based on a lower level storage replication layer. This layer was originally called HDSL (Hadoop Distributed Storage Layer) and later renamed to HDDS (Hadoop Distributed Data Storage). + +Implementation of the generic storage layer began under [HDFS-11118](https://issues.apache.org/jira/browse/HDFS-11118) together with a iScsi/[jScsi](https://github.com/sebastiangraf/jSCSI) based block storage layer ("CBlock") introduced by [HDFS-11361](https://issues.apache.org/jira/browse/HDFS-11361). + +As a summary: + + * HDDS (earlier HDSL): replicates huge binary _containers_ between datanodes + * Ozone: provides Object Store semantics with the help of HDDS + * CBlock: provides mountable volumes with the help of the HDDS layer (based on iScsi protocol) + +In the beginning of the year 2017 a new poddling project was started inside [Apache Incubator](http://incubator.apache.org/): [Apache Ratis](https://ratis.apache.org/). Ratis is an embeddable RAFT protcol implementation it is which became the corner stone of consensus inside both Ozone and HDDS projects. (Started to [be used](https://issues.apache.org/jira/browse/HDFS-11519) by Ozone in March of 2017) Review comment: ```suggestion In the beginning of the year 2017 a new podling project was started inside [Apache Incubator](http://incubator.apache.org/): [Apache Ratis](https://ratis.apache.org/). Ratis is an embeddable RAFT protcol implementation it is which became the corner stone of consensus inside both Ozone and HDDS projects. (Started to [be used](https://issues.apache.org/jira/browse/HDFS-11519) by Ozone in March of 2017) ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
