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Restore SearchStat to retain backward compatibility with older Blitz's particularly for Dashboard.
author Dan Creswell <dan.creswell@gmail.com>
date Fri, 28 Aug 2009 21:01:53 +0100
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1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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2 <html>
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3 <head>
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7 <title>Blitz Overview</title>
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8 </head>
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11 <body>
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16 <h1>Blitz - Javaspaces Made Simple</h1>
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20 <p>The <a href="http://www.dancres.org/blitz/index.html">Blitz</a> JavaSpaces<sup>TM</sup>
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21 implementation aims to provide a rich set of features to make the
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22 development &amp; deployment of JavaSpaces technology easier, more
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23 efficient and more fun to experiment with.
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24 </p>
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27 <p>The Blitz Project is the first <a href="http://www.jini.org/">Jini<sup>TM</sup></a> 2.x compliant JavaSpace to be made available under an <a href="http://www.opensource.org/">OpenSource</a> <a href="LICENSE.TXT">license</a>.</p>
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31 <h2>Key features</h2>
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35 <ul>
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38 <li>Ease of installation.</li>
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42 <li>Jini 2.x enabled.</li>
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46 <li>Use of established VM principles.</li>
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50 <li>Smart indexing.</li>
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54 <li>Tuneable persistence.</li>
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58 <li>Tools.</li>
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62 <li>Entry Browsing.</li>
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66 <li>Embeddable Space support.</li>
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70 <li>Active/Passive/Manual lease cleanup.</li>
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74 <li>Built for experimentation and expansion.</li>
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78 <li>Easy integration with the Inca X IDE &amp; Runtime Environment.</li>
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81 </ul>
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86 <h3>Ease of installation</h3>
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87
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88 Blitz aims to make installation simpler by not relying on other visible
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89 services such as RDBMS products (which tend to require significant
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90 admininistration knowledge of both the RDBMS and the OS) and providing
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91 default configurations which make it useful out of the box.
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92
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93 <h3>JINI 2.x Enabled</h3>
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97 First-class support for a variety of security configurations and deployment environments.
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98
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99 <h3>Use of established VM Principles</h3>
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102
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103 <p>Blitz's central abstraction for Entry storage is based on the
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104 classic Virtual Memory (VM) concept such that a set of Entry's are
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105 cached in memory at any one time and then paged, as required, according
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106 to an algorithm which typically bases it's decisions on usage patterns.
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107 &nbsp;In addition, readahead can be supported such that we can fault in
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108 a collection of potentially matching Entry's when the cache has
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109 provided no suitable candidates.
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110 </p>
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114 <p>This re-use of an OS concept allows Blitz to take advantage of a
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115 huge body of existing research with respect to effective caching in the
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116 face of varying application behaviour (some will have hotspots, some
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117 will be random, some will reference things strictly in order).</p>
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120
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121 <p>Different JavaSpace applications will have common sets of behaviour
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122 from a cache usage perspective. Blitz architecture makes it possible to
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123 support several different cache management strategies and allow an
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124 astute user to pick the one most suited to their application behaviour.
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125 </p>
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129 <h3>Smart Indexing</h3>
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133 <p>Blitz uses on disk and in-memory Entry storage, which is fully indexed automatically and keeps search times to a minimum.
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134 </p>
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138 <h3>Tunable persistence</h3>
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139
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140
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141
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142 <p>Disk space is now cheap &amp; efficient both in speed and
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143 reliability which reduces the motivation for developing a memory-only
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144 JavaSpace. The basic performance limit for a persistent space is
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145 related to guarenteeing consistency which is determined by the speed
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146 with which a system can force log entries to disk. Blitz tackles these
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147 problems by providing a range of profiles (Storage Models) giving
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148 different tradeoffs between data-integrity and speed.</p>
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149
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150
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151
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152 <ul>
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153
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154
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155 <li>VM-style caching with full consistent logging to ensure all changes are durable - full persistence.</li>
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156
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157
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158
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159 <li>VM-style caching with periodic flushing (after x seconds) - ensuring all changes x seconds ago are persistent.</li>
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160
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161
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162
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163 <li>VM-style caching with no logging - if your cache is big enough to
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164 hold the working-set of Entry's for your application, no paging occurs
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165 so all work is performed in memory with no disk access required -
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166 transient.</li>
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167
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168
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169 </ul>
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170
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171
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172
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173 <h3>Tools</h3>
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174
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175
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176
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177 A selection of tools are provided to assist developers and administrators:
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178
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179 <ol>
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180
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181
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182 <li>Dashboard - GUI tool which displays useful information such as
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183 the number of instances of each type, number of currently active
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184 transactions, operation totals and memory consumption.</li>
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185
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186
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187 <li>SyncAndShutdown - Flushes all updates to disk and shuts down a Blitz JavaSpaces instance.</li>
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188
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189
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190 <li>DumpEntries - Displays the current contents of a Blitz JavaSpaces instance optionally unpacking and displaying each Entry.</li>
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191
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192
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193 <li>Cleanup - Clears all Entry's from the Blitz JavaSpaces instance
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194 and removes all schema information allowing for re-definition of Entry
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195 structure with no restart required.</li>
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196
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197
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198 <li>EntrySizer - assists in calculating Blitz JVM memory footprint</li>
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199
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200
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201 </ol>
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202
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203
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204
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205 <h3>Entry Browsing</h3>
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206
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207
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208
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209 <p>Blitz JavaSpaces supports <code>com.sun.jini.outrigger.JavaSpaceAdmin</code> allowing appropriate Service Browsers (e.g. Inca X's community browser) to view and manipulate the Entry's within an instance.</p>
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210
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211
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212
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213 <h3>Embeddable Space support</h3>
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214
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215 Certain multi-threaded applications, running in a single JVM, can
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216 benefit from the use of JavaSpaces. In these situations, having the
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217 JavaSpace available as a remote service is undesirable. This feature
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218 allows an application to run Blitz locally, within it's own JVM,
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219 providing a performance boost.
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220
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221 <h3>Active/Passive lease cleanup</h3>
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222
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223
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224
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225 <p>In high-performance applications, the cost of tracking lease expiry
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226 and clearing expired entries from disk may affect throughput
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227 sufficiently that it is more economical to accept that some disk-space
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228 will be lost to expired entries. Conversely, in environments where
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229 disk-space is at a premium, it may be more appropriate to expend
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230 processor and disk time doing full cleanup of expired entries.</p>
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231
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232
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233
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234 <p>Blitz provides three options for handling lease expiry processing:</p>
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235
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236
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237 <ol>
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238
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239
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240 <li>When an expired entry is loaded into cache-memory, it will be
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241 marked for deletion at the next cache flush. This has the effect of
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242 cleaning up entries which are slowing down the speed of searches.
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243 (passive cleanup)</li>
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244
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245
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246 <li>Occasional background scans of disk storage to find and remove
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247 expired entry's that never get into cache. This has the effect of
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248 conserving disk space. (active cleanup)</li>
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249
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250
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251 <li>User requested background scans of disk storage to find and remove expired entry's. (manual cleanup)</li>
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252
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253
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254 </ol>
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255
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256
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257
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258 <p><b>Note</b>: the active cleanup code by default, is turned <em>off</em>. It can be turned on by setting the <code>leaseReapInterval</code> variable in the configuration file to a non-zero value.</p>
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259
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260
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261
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262 <p><b>Note</b>: the manual cleanup code by default, is turned <em>off</em>. It can be turned on by setting the <code>leaseReapInterval</code> variable in the configuration file to <code>org.dancres.blitz.lease.LeaseReaper.MANUAL_REAP</code>.</p>
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263
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264
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265
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266 <h3>Built for experimentation and expansion</h3>
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267
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268 Because Blitz is open-source, should the need arise, you can make
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269 whatever changes you desire. The design is based on a small number of
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270 generic abstractions making it easy (hopefully) to get to grips with
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271 the code.
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272
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273 <h3>Easy integration with the Inca X IDE &amp; Runtime Environment</h3>
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274
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276
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277 The <a href="http://www.incax.com/">Inca X</a> team have been testing
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278 Blitz and have built an installer to integrate it into all versions of
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279 their IDE &amp; Runtime Environment.
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280
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281 <h2>Maturing with further development</h2>
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282
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283
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284
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285 <p>Looking at RDBMS technology, one can see that it has reached
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286 maturity - these are some of the defining characteristics of such a
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287 market:
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288 </p>
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289
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291
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292 <ul>
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293
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294
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295 <li>A few dominant vendors.</li>
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296
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297
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298
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299 <li>A large body of technical research.</li>
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300
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301
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302
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303 <li>Established benchmarks.</li>
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304
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305
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306
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307 <li>Large number of common features between vendors.</li>
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308
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309
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310
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311 <li>A large body of knowledge with respect to application development and how to get appropriate performance.</li>
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312
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313
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314
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315 </ul>
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316
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318
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319 <p>The maturity of the RDBMS market is in marked contrast to the
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320 JavaSpaces technology where there's still a substantial amount of work
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321 to be done.
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322 </p>
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323
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324
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325
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326 <p>Blitz is intended to be a vehicle for furthering the development of
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327 JavaSpaces technology covering issues as diverse as internal
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328 implementation, application development (usage patterns, frameworks
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329 etc) and administration/deployment.
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330 </p>
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331
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332
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333
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334 <h2>About Blitz</h2>
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335
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336
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337
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338 The Blitz project was started by Dan Creswell.
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339
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340 <h3>Credits</h3>
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341
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342
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343
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344 Blitz uses:
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345
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346 <ol>
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347
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348
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349 <li><a href="http://gee.cs.oswego.edu/dl/classes/EDU/oswego/cs/dl/util/concurrent/intro.html">Doug Lea's util.concurrent package</a></li>
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350
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351
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352 <li><a href="http://teatrove.sourceforge.net/trove.html">TeaTrove</a></li>
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353
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354
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355 <li><a href="http://www.prevayler.org/">Prevayler</a></li>
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356
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357
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358 <li><a href="http://www.sleepycat.com/">Berkeley Db and Berkeley Db Java Edition</a></li>
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359
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360
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361 </ol>
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362
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363
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364
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365 <p></p>
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366
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367 <div align="center"><a href="../index.html">Back to Documentation</a></div>
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368
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369
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370
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371 <p><i>Java and all Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc. in the U. S. and other countries</i></p>
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372
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374
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375 </body>
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376 </html>