0c883a23c5
------------------------------------------------------ TL;DR ------------------------------------------------------ We are moving from Inheritence - Observer *is* Coprocessor - FooService *is* CoprocessorService To Composition - Coprocessor *has* Observer - Coprocessor *has* Service ------------------------------------------------------ Design Changes ------------------------------------------------------ - Adds four new interfaces - MasterCoprocessor, RegionCoprocessor, RegionServierCoprocessor, WALCoprocessor - These new *Coprocessor interfaces have a get*Observer() function for each observer type supported by them. - Added Coprocessor#getService() to base interface. All extending *Coprocessor interfaces will get it from the base interface. - Added BulkLoadObserver hooks to RegionCoprocessorHost instad of SecureBulkLoadManager doing its own trickery. - CoprocessorHost#find*() fuctions: Too many testing hooks digging into CP internals. Deleted if can, else marked @VisibleForTesting. ------------------------------------------------------ Backward Compatibility ------------------------------------------------------ - Old coprocessors implementing *Observer won't get loaded (no backward compatibility guarantees). - Third party coprocessors only implementing Coprocessor will not get loaded (just like Observers). - Old coprocessors implementing CoprocessorService (for master/region host) /SingletonCoprocessorService (for RegionServer host) will continue to work with 2.0. - Added test to ensure backward compatibility of CoprocessorService/SingletonCoprocessorService - Note that if a coprocessor implements both observer and service in same class, its service component will continue to work but it's observer component won't work. ------------------------------------------------------ Notes ------------------------------------------------------ Did a side-by-side comparison of CPs in master and after patch. These coprocessors which were just CoprocessorService earlier, needed a home in some coprocessor in new design. For most it was clear since they were using a particular type of environment. Some were tricky. - JMXListener - MasterCoprocessor and RSCoprocessor (because jmx listener makes sense for processes?) - RSGroupAdminEndpoint --> MasterCP - VisibilityController -> MasterCP and RegionCP These were converted to RegionCoprocessor because they were using RegionCoprocessorEnvironment which can only come from a RegionCPHost. - AggregateImplementation - BaseRowProcessorEndpoint - BulkDeleteEndpoint - Export - RefreshHFilesEndpoint - RowCountEndpoint - MultiRowMutationEndpoint - SecureBulkLoadEndpoint - TokenProvider Change-Id: I813145f2bc11815f52ac703563b879962c249764 |
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| conf | ||
| dev-support | ||
| hbase-annotations | ||
| hbase-archetypes | ||
| hbase-assembly | ||
| hbase-backup | ||
| hbase-build-configuration | ||
| hbase-checkstyle | ||
| hbase-client | ||
| hbase-common | ||
| hbase-endpoint | ||
| hbase-examples | ||
| hbase-external-blockcache | ||
| hbase-hadoop-compat | ||
| hbase-hadoop2-compat | ||
| hbase-it | ||
| hbase-mapreduce | ||
| hbase-metrics | ||
| hbase-metrics-api | ||
| hbase-native-client | ||
| hbase-prefix-tree | ||
| hbase-procedure | ||
| hbase-protocol | ||
| hbase-protocol-shaded | ||
| hbase-replication | ||
| hbase-resource-bundle | ||
| hbase-rest | ||
| hbase-rsgroup | ||
| hbase-server | ||
| hbase-shaded | ||
| hbase-shell | ||
| hbase-spark | ||
| hbase-spark-it | ||
| hbase-testing-util | ||
| hbase-thrift | ||
| src/main | ||
| .gitattributes | ||
| .gitignore | ||
| .pylintrc | ||
| 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