f444b3b542
Reason for refactor: In cases where one might need to use multiple observers, say region, master and regionserver; and the fact that only one class can be extended, it gives rise to following pattern: public class BaseMasterAndRegionObserver extends BaseRegionObserver implements MasterObserver class AccessController extends BaseMasterAndRegionObserver implements RegionServerObserver were BaseMasterAndRegionObserver is full copy of BaseMasterObserver. There is an example of simple case too where the current design fails. Say only one observer is needed by the coprocessor, but the design doesn't permit extending even that single observer (see RSGroupAdminEndpoint), that leads to copy of full Bas e...Observer class into coprocessor class leading to 1000s of lines of code and this ugly mix of 5 main functions with 100 useless functions. Javadocs changes: - Adds class comments on 'default' methods and expectations. - Adds explanaiton of Exception handling in Observers' class comment. Removes redundant @throws before each function. - Improves javadocs for a bunch of functions - deletes empty @params in a bunch of places Change-Id: I265738d47e8554e7b4678e88bb916a0cc7d00ab3 |
||
|---|---|---|
| bin | ||
| conf | ||
| dev-support | ||
| hbase-annotations | ||
| hbase-archetypes | ||
| hbase-assembly | ||
| hbase-checkstyle | ||
| hbase-client | ||
| hbase-common | ||
| hbase-endpoint | ||
| hbase-examples | ||
| hbase-external-blockcache | ||
| hbase-hadoop-compat | ||
| hbase-hadoop2-compat | ||
| hbase-it | ||
| hbase-metrics | ||
| hbase-metrics-api | ||
| hbase-native-client | ||
| hbase-prefix-tree | ||
| hbase-procedure | ||
| hbase-protocol | ||
| hbase-protocol-shaded | ||
| hbase-resource-bundle | ||
| hbase-rest | ||
| hbase-rsgroup | ||
| hbase-server | ||
| hbase-shaded | ||
| hbase-shell | ||
| hbase-spark | ||
| hbase-testing-util | ||
| hbase-thrift | ||
| src/main | ||
| .gitattributes | ||
| .gitignore | ||
| CHANGES.txt | ||
| LICENSE.txt | ||
| NOTICE.txt | ||
| README.txt | ||
| pom.xml | ||
README.txt
Apache HBase [1] is an open-source, distributed, versioned, column-oriented store modeled after Google' Bigtable: A Distributed Storage System for Structured Data by Chang et al.[2] Just as Bigtable leverages the distributed data storage provided by the Google File System, HBase provides Bigtable-like capabilities on top of Apache Hadoop [3]. To get started using HBase, the full documentation for this release can be found under the doc/ directory that accompanies this README. Using a browser, open the docs/index.html to view the project home page (or browse to [1]). The hbase 'book' at http://hbase.apache.org/book.html has a 'quick start' section and is where you should being your exploration of the hbase project. The latest HBase can be downloaded from an Apache Mirror [4]. The source code can be found at [5] The HBase issue tracker is at [6] Apache HBase is made available under the Apache License, version 2.0 [7] The HBase mailing lists and archives are listed here [8]. The HBase distribution includes cryptographic software. See the export control notice here [9]. 1. http://hbase.apache.org 2. http://research.google.com/archive/bigtable.html 3. http://hadoop.apache.org 4. http://www.apache.org/dyn/closer.cgi/hbase/ 5. https://hbase.apache.org/source-repository.html 6. https://hbase.apache.org/issue-tracking.html 7. http://hbase.apache.org/license.html 8. http://hbase.apache.org/mail-lists.html 9. https://hbase.apache.org/export_control.html