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Add some cache/memory statistics to help spot potential exhaustion and other tuning issues.
author Dan Creswell <dan.creswell@gmail.com>
date Fri, 28 Aug 2009 17:23:33 +0100
parents 3dc0c5604566
children
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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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4 <title>Tools Guide</title>
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5
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6
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7 <meta http-equiv="Content-type" content="text/html; charset=iso-8859-1">
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8
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9 <link rel="stylesheet" type="text/css" href="ssl.css">
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10
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11 </head>
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12
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13 <body style="background-color: rgb(255, 255, 255);">
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14
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15 <a name="tools"></a>
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16 <h1>Tools Guide</h1>
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17
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18 <h3>Dashboard</h3>
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19
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20 Used to monitor a Blitz JavaSpaces instance as it runs. You can
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21 graphically access statistics such as memory usage, instance counts and
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22 number of active transactions. Graphing options are also provided,
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23 where appropriate.
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24 Dashboard supports lookup of a Blitz JavaSpaces instance via multicast
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25 discovery (just specify the space name) or unicast discovery (specify
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26 the lookup service host and the space name):
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27 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/dashboard.jar:lib/stats.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.dash.StartDashBoard dancres<br></pre>
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28
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29 or
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30 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath lib/dashboard.jar:lib/stats.jar:/home/dan/jini/jini2_1/lib/jsk-lib.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.dash.StartDashBoard rogue:4160 dancres<br></pre>
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31
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32 <p><b>NOTE:</b> The provision of stats can be
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33 controlled programmatically or via the configuration file. Currently,
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34 for Dashboard to provide full information, you must have enabled
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35 appropriate options in the configuration file - e.g.:</p>
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36
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37 <pre>import org.dancres.blitz.stats.Switch;<br>import org.dancres.blitz.stats.OpSwitch;<br>import org.dancres.blitz.stats.InstanceSwitch;<br><br>org.dancres.blitz {<br> stats = new Switch[] {new OpSwitch(OpSwitch.ALL_TYPES,<br> OpSwitch.TAKE_OPS, true),<br> new OpSwitch(OpSwitch.ALL_TYPES, OpSwitch.READ_OPS, true),<br> new OpSwitch(OpSwitch.ALL_TYPES, OpSwitch.WRITE_OPS, true),<br> new InstanceSwitch(InstanceSwitch.ALL_TYPES, true)};<br>}<br></pre>
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38
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39 <hr align="center" size="3" width="70%">
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40 <h3>SyncAndShutdown</h3>
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41
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42 Used to shutdown a Blitz instance and sync all it's state to disk. This
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43 tool works with all <code>StorageModel</code>s including <code>Transient</code>.
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44 <code>SyncAndShutdown</code> supports lookup of a Blitz
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45 JavaSpaces instance via multicast discovery (just specify the space
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46 name) or unicast discovery (specify the lookup service host and the
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47 space name):
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48 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.SyncAndShutdown dancres<br></pre>
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49
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50 or
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51 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.SyncAndShutdown rogue:4160 dancres<br></pre>
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52
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53 <p><b>NOTE:</b>The shutdown of a Blitz instance may
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54 result in the loss of state associated with transactions active (not
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55 commited) at the time of shutdown. Typically, entries written under
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56 such transactions will be lost and any takes performed will not have
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57 been completed such that the <code>Entry</code>s will
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58 remain in the databases. All <code>Entry</code>s untouched
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59 by transactions are <em>guarenteed</em> to be undamaged.</p>
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60
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61 <hr align="center" size="3" width="70%">
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62 <h3>DumpEntries</h3>
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63
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64 Used to dump the contents of a Blitz instance's databases after it's
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65 been shutdown with <code>SyncAndShutdown</code>. This tool
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66 will work in combination with <code>SyncAndShutdown</code>
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67 against even a transient Blitz instance.
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68 <p>Basic usage of <code>DumpEntries</code> requires
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69 that you specify the blitz configuration file of the Blitz instance
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70 whose contents you wish to display.</p>
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71
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72 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:dbjava/je.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.DumpEntries config/blitz.config<br></pre>
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73
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74 <p><code>DumpEntries</code> will display not only
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75 Blitz internal information but will also attempt to unpack the Entry
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76 instance and display it using the relevant codebase. To disable this
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77 feature (perhaps because the codebase is not available) run <code>DumpEntries</code>
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78 as follows:</p>
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79
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80 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all -Dnounpack=true<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:dbjava/je.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.DumpEntries config/blitz.config<br></pre>
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81
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82 <p><b>NOTE:</b> Dumping the contents of a Blitz
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83 instance should <em>only</em> be done after it's been
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84 shutdown using <code>SyncAndShutdown</code>. <code>DumpEntries</code>
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85 is strictly read-only and, therefore, cannot damage the contents of the
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86 databases.</p>
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87
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88 <hr align="center" size="3" width="70%">
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89 <h3>HotBackup (experimental)</h3>
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90
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91 Used to make a hot backup of a blitz instance. Arguments are a
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92 directory to backup to and either a space name or an LUS host URL and
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93 spacename. Note that the specified directory must be available to the
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94 machine on which the Blitz instance is running.
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95 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.HotBackup /home/dan/src/jini/space/backups dancres<br></pre>
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96
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97 or
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98 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.HotBackup /home/dan/src/jini/space/backups rogue:4160 dancres<br></pre>
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99
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100 <p><b>Note:</b> the specified directory should be
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101 empty otherwise the backup will be refused.</p>
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102
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103 <hr align="center" size="3" width="70%">
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104 <h3>Entry Cleaning (experimental)</h3>
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105
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106 <p>The <code>Cleanup</code> tool remotely connects
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107 to a specified Blitz instance causing it to clean out all old Entry's.
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108 The process performs the following steps:</p>
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109
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110 <ol>
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111
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112 <li>Kill all outstanding blocking matches</li>
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113
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114 <li>Abort all outstanding transactions</li>
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115
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116 <li>Delete all Entry's</li>
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117
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118 <li>Checkpoint (to ensure all deletes are commited to disk)</li>
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119
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120 <li>Delete all repositories</li>
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121
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122 </ol>
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123
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124 <p><code>Cleanup</code> supports lookup of a Blitz
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125 JavaSpaces instance via multicast discovery (just specify the space
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126 name) or unicast discovery (specify the lookup service host and the
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127 space name):</p>
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128
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129 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.Cleanup dancres<br></pre>
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130
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131 or
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132 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.Cleanup rogue:4160 dancres<br></pre>
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133
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134 <hr align="center" size="3" width="70%">
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135 <h3>Manual Lease Reaping</h3>
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136
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137 Used to cause Blitz to perform a single lease-reaping pass clearing out
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138 all dead Entrys. Ensure that <code>leaseReapInterval</code>
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139 is set to <code>LeaseReaper.MANUAL_REAP</code>. Failure to
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140 set this option will cause manual lease cleanup to fail.
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141 This tool works with all <code>StorageModel</code>s
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142 including <code>Transient</code>. <code>RequestReap</code>
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143 supports lookup of a Blitz JavaSpaces instance via multicast discovery
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144 (just specify the space name) or unicast discovery (specify the lookup
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145 service host and the space name):
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146 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.RequestReap dancres<br></pre>
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147
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148 or
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149 <pre>cd /home/dan/src/jini/space<br>java -Djava.security.policy=config/policy.all<br> -classpath /home/dan/jini/jini2_1/lib/jsk-lib.jar:lib/blitz.jar:/home/dan/jini/jini2_1/lib/jsk-platform.jar:/home/dan/jini/jini2_1/lib/sun-util.jar<br> org.dancres.blitz.tools.RequestReap rogue:4160 dancres<br></pre>
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150
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151 <hr align="center" size="3" width="70%">
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152 <h3>Log Dumping</h3>
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153
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154 <p>This tool can be used offline in a similar fashion to
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155 DumpEntries, to examine Blitz's activity logs allowing the user to form
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156 a picture of exactly what operations were performed during a particular
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157 run. Log Dumping can only be used for persistent instances and includes
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158 details of lease renewals, notification registrations, transactions and
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159 read/write/take.</p>
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160
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161 <p>The tool requires a single argument which is the directory
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162 specified in the <code>logDir</code> variable of the
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163 relevant <code>.config</code>. Here's an example:</p>
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164
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165 <pre>java -Djava.security.policy=config/policy.all<br> -classpath /Users/dan/jini/jini2_1/lib/jsk-lib.jar:/Users/dan/jini/jini2_1/lib/jsk-platform.jar:lib/blitz.jar<br> org.prevayler.implementation.SnapshotPrevaylerImpl<br> /Users/dan/blitz-install/logs/<br></pre>
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166
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167 <p>Note that normally, only successful operations are logged but
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168 it can sometimes be useful to also see failed reads and takes. By
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169 default Blitz does not log these but you can enable it by adding <code>logSearches
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170 = new Boolean(true);</code> to your blitz configuration file.
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171 &nbsp;You may also wish to enable logging of instance counts by
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172 adding <code>logCounts = new Boolean(true);</code> to your blitz configuration file.</p>
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173
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174 <hr align="center" size="3" width="70%">
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175 <h3>Lookup Settings Import</h3>
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176
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177 <p>In accordance with the Jini specifications, Blitz will only read the <code>initial</code>* lookup parameters from it's configuration file on first boot (in transient mode this means the parameters are re-read every boot, whilst persistent modes will deem first boot to occur when there's no previous log or database state present).</p>
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178
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179 <p>Under various circumstances it can be desirable to reset Blitz's internal lookup settings from a configuration file post first-boot. This <code>ReconfigLookup</code> tool is used to perform this task providing support to selectively import settings from a specified configuration file.</p>
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180
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181 <p><code>ReconfigLookup</code> accepts a path to a configuration file followed by one or more flags indicating which lookup settings to import. These flags are <code>-groups</code>, <code>-attrs</code>, <code>-locators</code>. An example usage of this tool appears below:</p>
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182
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183 <pre>java -Djava.security.policy=config/policy.all<br> -classpath /Users/dan/jini/jini2_1/lib/jsk-lib.jar:/Users/dan/jini/jini2_1/lib/jsk-platform.jar:lib/blitz.jar:dbjava/je.jar<br> org.dancres.blitz.tools.ReconfigLookup <br> /Users/dan/blitz/config/blitz.config <br> -groups -attrs -locators<br></pre>
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184
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185 </body>
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186 </html>