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* PoolMap does not discard any elements anymore. If an element is put, it always stores it. The reason: it stores expensive resources (rpc connections) which would lead to resource leak if we simple discard it. RpcClients can reference netty ByteBufs which are reference counted. Resource cleanup is done by AbstractRpcClient.cleanupIdleConnections(). * PoolMap does not implement Map interface anymore, so ensuring thread-safety has become easier. Put method is replaced with getOrCreate(). * ThreadLocalPool doesn't use ThreadLocal class anymore. It stores resources on thread basis, but it doesn't remove values when a thread exits. Again, proper cleanup is done by cleanupIdleConnections(). Signed-off-by: Sean Busbey <busbey@apache.org> Signed-off-by: Wellington Chevreuil <wellington.chevreuil@gmail.com>
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