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<h1>Source code for cassandra.metrics</h1><div class="highlight"><pre>
<span></span><span class="c1"># Copyright DataStax, Inc.</span>
<span class="c1">#</span>
<span class="c1"># Licensed under the Apache License, Version 2.0 (the "License");</span>
<span class="c1"># you may not use this file except in compliance with the License.</span>
<span class="c1"># You may obtain a copy of the License at</span>
<span class="c1">#</span>
<span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c1">#</span>
<span class="c1"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c1"># distributed under the License is distributed on an "AS IS" BASIS,</span>
<span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c1"># See the License for the specific language governing permissions and</span>
<span class="c1"># limitations under the License.</span>
<span class="kn">from</span> <span class="nn">itertools</span> <span class="k">import</span> <span class="n">chain</span>
<span class="kn">import</span> <span class="nn">logging</span>
<span class="k">try</span><span class="p">:</span>
<span class="kn">from</span> <span class="nn">greplin</span> <span class="k">import</span> <span class="n">scales</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ImportError</span><span class="p">(</span>
<span class="s2">"The scales library is required for metrics support: "</span>
<span class="s2">"https://pypi.python.org/pypi/scales"</span><span class="p">)</span>
<span class="n">log</span> <span class="o">=</span> <span class="n">logging</span><span class="o">.</span><span class="n">getLogger</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
<div class="viewcode-block" id="Metrics"><a class="viewcode-back" href="../../api/cassandra/metrics.html#cassandra.metrics.Metrics">[docs]</a><span class="k">class</span> <span class="nc">Metrics</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A collection of timers and counters for various performance metrics.</span>
<span class="sd"> Timer metrics are represented as floating point seconds.</span>
<span class="sd"> """</span>
<span class="n">request_timer</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.PmfStat` timer for requests. This is a dict-like</span>
<span class="sd"> object with the following keys:</span>
<span class="sd"> * count - number of requests that have been timed</span>
<span class="sd"> * min - min latency</span>
<span class="sd"> * max - max latency</span>
<span class="sd"> * mean - mean latency</span>
<span class="sd"> * stddev - standard deviation for latencies</span>
<span class="sd"> * median - median latency</span>
<span class="sd"> * 75percentile - 75th percentile latencies</span>
<span class="sd"> * 95percentile - 95th percentile latencies</span>
<span class="sd"> * 98percentile - 98th percentile latencies</span>
<span class="sd"> * 99percentile - 99th percentile latencies</span>
<span class="sd"> * 999percentile - 99.9th percentile latencies</span>
<span class="sd"> """</span>
<span class="n">connection_errors</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of the number of times that a</span>
<span class="sd"> request to a Cassandra node has failed due to a connection problem.</span>
<span class="sd"> """</span>
<span class="n">write_timeouts</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of write requests that resulted</span>
<span class="sd"> in a timeout.</span>
<span class="sd"> """</span>
<span class="n">read_timeouts</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of read requests that resulted</span>
<span class="sd"> in a timeout.</span>
<span class="sd"> """</span>
<span class="n">unavailables</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of write or read requests that</span>
<span class="sd"> failed due to an insufficient number of replicas being alive to meet</span>
<span class="sd"> the requested :class:`.ConsistencyLevel`.</span>
<span class="sd"> """</span>
<span class="n">other_errors</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of all other request failures,</span>
<span class="sd"> including failures caused by invalid requests, bootstrapping nodes,</span>
<span class="sd"> overloaded nodes, etc.</span>
<span class="sd"> """</span>
<span class="n">retries</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of the number of times a</span>
<span class="sd"> request was retried based on the :class:`.RetryPolicy` decision.</span>
<span class="sd"> """</span>
<span class="n">ignores</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of the number of times a</span>
<span class="sd"> failed request was ignored based on the :class:`.RetryPolicy` decision.</span>
<span class="sd"> """</span>
<span class="n">known_hosts</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of the number of nodes in</span>
<span class="sd"> the cluster that the driver is aware of, regardless of whether any</span>
<span class="sd"> connections are opened to those nodes.</span>
<span class="sd"> """</span>
<span class="n">connected_to</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of the number of nodes that</span>
<span class="sd"> the driver currently has at least one connection open to.</span>
<span class="sd"> """</span>
<span class="n">open_connections</span> <span class="o">=</span> <span class="kc">None</span>
<span class="sd">"""</span>
<span class="sd"> A :class:`greplin.scales.IntStat` count of the number connections</span>
<span class="sd"> the driver currently has open.</span>
<span class="sd"> """</span>
<span class="n">_stats_counter</span> <span class="o">=</span> <span class="mi">0</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">cluster_proxy</span><span class="p">):</span>
<span class="n">log</span><span class="o">.</span><span class="n">debug</span><span class="p">(</span><span class="s2">"Starting metric capture"</span><span class="p">)</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span> <span class="o">=</span> <span class="s1">'cassandra-</span><span class="si">{0}</span><span class="s1">'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="nb">str</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_stats_counter</span><span class="p">))</span>
<span class="n">Metrics</span><span class="o">.</span><span class="n">_stats_counter</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats</span> <span class="o">=</span> <span class="n">scales</span><span class="o">.</span><span class="n">collection</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span><span class="p">,</span>
<span class="n">scales</span><span class="o">.</span><span class="n">PmfStat</span><span class="p">(</span><span class="s1">'request_timer'</span><span class="p">),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">IntStat</span><span class="p">(</span><span class="s1">'connection_errors'</span><span class="p">),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">IntStat</span><span class="p">(</span><span class="s1">'write_timeouts'</span><span class="p">),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">IntStat</span><span class="p">(</span><span class="s1">'read_timeouts'</span><span class="p">),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">IntStat</span><span class="p">(</span><span class="s1">'unavailables'</span><span class="p">),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">IntStat</span><span class="p">(</span><span class="s1">'other_errors'</span><span class="p">),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">IntStat</span><span class="p">(</span><span class="s1">'retries'</span><span class="p">),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">IntStat</span><span class="p">(</span><span class="s1">'ignores'</span><span class="p">),</span>
<span class="c1"># gauges</span>
<span class="n">scales</span><span class="o">.</span><span class="n">Stat</span><span class="p">(</span><span class="s1">'known_hosts'</span><span class="p">,</span>
<span class="k">lambda</span><span class="p">:</span> <span class="nb">len</span><span class="p">(</span><span class="n">cluster_proxy</span><span class="o">.</span><span class="n">metadata</span><span class="o">.</span><span class="n">all_hosts</span><span class="p">())),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">Stat</span><span class="p">(</span><span class="s1">'connected_to'</span><span class="p">,</span>
<span class="k">lambda</span><span class="p">:</span> <span class="nb">len</span><span class="p">(</span><span class="nb">set</span><span class="p">(</span><span class="n">chain</span><span class="o">.</span><span class="n">from_iterable</span><span class="p">(</span><span class="n">s</span><span class="o">.</span><span class="n">_pools</span><span class="o">.</span><span class="n">keys</span><span class="p">()</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">cluster_proxy</span><span class="o">.</span><span class="n">sessions</span><span class="p">)))),</span>
<span class="n">scales</span><span class="o">.</span><span class="n">Stat</span><span class="p">(</span><span class="s1">'open_connections'</span><span class="p">,</span>
<span class="k">lambda</span><span class="p">:</span> <span class="nb">sum</span><span class="p">(</span><span class="nb">sum</span><span class="p">(</span><span class="n">p</span><span class="o">.</span><span class="n">open_count</span> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">s</span><span class="o">.</span><span class="n">_pools</span><span class="o">.</span><span class="n">values</span><span class="p">())</span> <span class="k">for</span> <span class="n">s</span> <span class="ow">in</span> <span class="n">cluster_proxy</span><span class="o">.</span><span class="n">sessions</span><span class="p">)))</span>
<span class="c1"># TODO, to be removed in 4.0</span>
<span class="c1"># /cassandra contains the metrics of the first cluster registered</span>
<span class="k">if</span> <span class="s1">'cassandra'</span> <span class="ow">not</span> <span class="ow">in</span> <span class="n">scales</span><span class="o">.</span><span class="n">_Stats</span><span class="o">.</span><span class="n">stats</span><span class="p">:</span>
<span class="n">scales</span><span class="o">.</span><span class="n">_Stats</span><span class="o">.</span><span class="n">stats</span><span class="p">[</span><span class="s1">'cassandra'</span><span class="p">]</span> <span class="o">=</span> <span class="n">scales</span><span class="o">.</span><span class="n">_Stats</span><span class="o">.</span><span class="n">stats</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">request_timer</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">request_timer</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connection_errors</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">connection_errors</span>
<span class="bp">self</span><span class="o">.</span><span class="n">write_timeouts</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">write_timeouts</span>
<span class="bp">self</span><span class="o">.</span><span class="n">read_timeouts</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">read_timeouts</span>
<span class="bp">self</span><span class="o">.</span><span class="n">unavailables</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">unavailables</span>
<span class="bp">self</span><span class="o">.</span><span class="n">other_errors</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">other_errors</span>
<span class="bp">self</span><span class="o">.</span><span class="n">retries</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">retries</span>
<span class="bp">self</span><span class="o">.</span><span class="n">ignores</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">ignores</span>
<span class="bp">self</span><span class="o">.</span><span class="n">known_hosts</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">known_hosts</span>
<span class="bp">self</span><span class="o">.</span><span class="n">connected_to</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">connected_to</span>
<span class="bp">self</span><span class="o">.</span><span class="n">open_connections</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">open_connections</span>
<span class="k">def</span> <span class="nf">on_connection_error</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">connection_errors</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">def</span> <span class="nf">on_write_timeout</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">write_timeouts</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">def</span> <span class="nf">on_read_timeout</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">read_timeouts</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">def</span> <span class="nf">on_unavailable</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">unavailables</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">def</span> <span class="nf">on_other_error</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">other_errors</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">def</span> <span class="nf">on_ignore</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">ignores</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="k">def</span> <span class="nf">on_retry</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats</span><span class="o">.</span><span class="n">retries</span> <span class="o">+=</span> <span class="mi">1</span>
<div class="viewcode-block" id="Metrics.get_stats"><a class="viewcode-back" href="../../api/cassandra/metrics.html#cassandra.metrics.Metrics.get_stats">[docs]</a> <span class="k">def</span> <span class="nf">get_stats</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Returns the metrics for the registered cluster instance.</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">scales</span><span class="o">.</span><span class="n">getStats</span><span class="p">()[</span><span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span><span class="p">]</span></div>
<div class="viewcode-block" id="Metrics.set_stats_name"><a class="viewcode-back" href="../../api/cassandra/metrics.html#cassandra.metrics.Metrics.set_stats_name">[docs]</a> <span class="k">def</span> <span class="nf">set_stats_name</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">stats_name</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Set the metrics stats name.</span>
<span class="sd"> The stats_name is a string used to access the metris through scales: scales.getStats()[<stats_name>]</span>
<span class="sd"> Default is 'cassandra-<num>'.</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span> <span class="o">==</span> <span class="n">stats_name</span><span class="p">:</span>
<span class="k">return</span>
<span class="k">if</span> <span class="n">stats_name</span> <span class="ow">in</span> <span class="n">scales</span><span class="o">.</span><span class="n">_Stats</span><span class="o">.</span><span class="n">stats</span><span class="p">:</span>
<span class="k">raise</span> <span class="ne">ValueError</span><span class="p">(</span><span class="s1">'"</span><span class="si">{0}</span><span class="s1">" already exists in stats.'</span><span class="o">.</span><span class="n">format</span><span class="p">(</span><span class="n">stats_name</span><span class="p">))</span>
<span class="n">stats</span> <span class="o">=</span> <span class="n">scales</span><span class="o">.</span><span class="n">_Stats</span><span class="o">.</span><span class="n">stats</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span><span class="p">]</span>
<span class="k">del</span> <span class="n">scales</span><span class="o">.</span><span class="n">_Stats</span><span class="o">.</span><span class="n">stats</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span><span class="p">]</span>
<span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span> <span class="o">=</span> <span class="n">stats_name</span>
<span class="n">scales</span><span class="o">.</span><span class="n">_Stats</span><span class="o">.</span><span class="n">stats</span><span class="p">[</span><span class="bp">self</span><span class="o">.</span><span class="n">stats_name</span><span class="p">]</span> <span class="o">=</span> <span class="n">stats</span></div></div>
</pre></div>
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