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Nicolas Spiegelberg b955fa6c32 Ability to calculate the blockcache hit ratio for the last few minutes 
Summary:
The metric blockcacheHitRatio is since the beginning of time. It would be nice
to calculate the block cache hit ratio for the past few minutes.

This patch remembers the blockcacheHitRatio for the last 5 periods by default.

Test Plan: unit test attached.

Reviewers: jgray, khemani, nspiegelberg, JIRA

Reviewed By: nspiegelberg

CC: nspiegelberg, dhruba

Differential Revision: 585

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1210640 13f79535-47bb-0310-9956-ffa450edef68
 		2011-12-05 21:17:47 +00:00
bin HBASE-4884 Allow environment overrides for various HBase processes 2011-11-29 05:54:59 +00:00
conf HBASE-2742 Provide strong authentication with a secure RPC engine 2011-11-18 07:34:43 +00:00
dev-support HBASE-4826 Modify hbasetests.sh to take into account the new pom.xml with surefire 2011-11-19 22:35:50 +00:00
security/src HBASE-4903 addendum for security build 2011-12-02 05:41:55 +00:00
src Ability to calculate the blockcache hit ratio for the last few minutes 2011-12-05 21:17:47 +00:00
.arcconfig HBASE-4611 Add support for Phabricator/Differential as an alternative code review tool 2011-11-01 20:23:50 +00:00
.gitignore HBASE-4611 Add support for Phabricator/Differential as an alternative code review tool 2011-11-01 20:23:50 +00:00
CHANGES.txt HBASE-4942 HMaster is unable to start of HFile V1 is used (Honghua Zhu) 2011-12-05 01:11:10 +00:00
LICENSE.txt HBASE-561 HBase package does not include LICENSE.txt nor build.xml 2008-04-03 22:39:46 +00:00
NOTICE.txt HBASE-4513 NOTICES.txt refers to Facebook for Thrift 2011-09-29 18:14:20 +00:00
README.txt HBASE-2672 README.txt should contain basic information like how to run or build HBase 2010-10-30 22:30:54 +00:00
pom.xml HBASE-4885 Building against Hadoop 0.23 uses out-of-date MapReduce artifacts 2011-11-29 06:04:17 +00:00

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 docs/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].

1. http://hbase.apache.org
2. http://labs.google.com/papers/bigtable.html
3. http://hadoop.apache.org
4. http://www.apache.org/dyn/closer.cgi/hbase/
5. http://hbase.apache.org/docs/current/source-repository.html
6. http://hbase.apache.org/docs/current/issue-tracking.html
7. http://hbase.apache.org/docs/current/license.html
8. http://hbase.apache.org/docs/current/mail-lists.html