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| <div class="section" id="write-proxy-configuration"> |
| <h1>Write Proxy Configuration<a class="headerlink" href="#write-proxy-configuration" title="Permalink to this headline">¶</a></h1> |
| <p>This section describes the configuration settings used by DistributedLog Write Proxy.</p> |
| <p>All the server related settings are managed in <cite>ServerConfiguration</cite>. Similar as <cite>DistributedLogConfiguration</cite>, |
| it is also a properties based configuration, which extends from Apache commons <cite>CompositeConfiguration</cite>. All |
| server related settings are in lower case and use <cite>'_'</cite> to concat words. For example, <cite>server_region_id</cite> means |
| the region id used by the write proxy server.</p> |
| <div class="section" id="server-configuration-settings"> |
| <h2>Server Configuration Settings<a class="headerlink" href="#server-configuration-settings" title="Permalink to this headline">¶</a></h2> |
| <ul class="simple"> |
| <li><em>server_dlsn_version</em>: The version of serialized format of DLSN. The default value is 1. It is not recommended to change it.</li> |
| <li><em>server_region_id</em>: The region id used by the server to instantiate a DL namespace. The default value is <cite>LOCAL</cite>.</li> |
| <li><em>server_port</em>: The listen port of the write proxy. The default value is 0.</li> |
| <li><em>server_shard</em>: The shard id used by the server to identify itself. It is optional but recommended to set. For example, if |
| the write proxy is running in <cite>Apache Aurora</cite>, you could use the instance id as the shard id. The default value is -1 (unset).</li> |
| <li><em>server_threads</em>: The number of threads for the executor of this server. The default value is the available processors.</li> |
| <li><em>server_enable_perstream_stat</em>: The flag to enable per stream stat in write proxy. It is different from <cite>enablePerStreamStat</cite> |
| in core library. The setting here is controlling exposing the per stream stat exposed by write proxy, while <cite>enablePerStreamStat</cite> |
| is to control expose the per stream stat exposed by the core library. It is enabled by default.</li> |
| <li><em>server_graceful_shutdown_period_ms</em>: The graceful shutdown period in milliseconds. The default value is 0.</li> |
| <li><em>server_service_timeout_ms</em>: The timeout period for the execution of a stream operation in write proxy. If it is positive, |
| write proxy will timeout requests if they are taking longer time than the threshold. Otherwise, the timeout feature is disabled. |
| By default, it is 0 (disabled).</li> |
| <li><em>server_stream_probation_timeout_ms</em>: The time period that a stream should be kept in cache in probationary state after service |
| timeout, in order to prevent ownership reacquiring. The unit is milliseconds. The default value is 5 minutes.</li> |
| <li><em>stream_partition_converter_class</em>: The stream-to-partition convert class. The converter is used to group streams together, which |
| these streams can apply same <cite>per-stream</cite> configuration settings or same other constraints. By default, it is an |
| <cite>IdentityStreamPartitionConverter</cite> which doesn't group any streams.</li> |
| </ul> |
| <div class="section" id="rate-limit-settings"> |
| <h3>Rate Limit Settings<a class="headerlink" href="#rate-limit-settings" title="Permalink to this headline">¶</a></h3> |
| <p>This section describes the rate limit settings per write proxy.</p> |
| <p>All the rate limit settings have both <cite>soft</cite> and <cite>hard</cite> thresholds. If the throughput goes above <cite>soft</cite> limit, |
| the requests won't be rejected but just logging in the stat. But if the throughput goes above <cite>hard</cite> limit, |
| the requests would be rejected immediately.</p> |
| <p>NOTE: <cite>bps</cite> stands for <cite>bytes per second</cite>, while <cite>rps</cite> stands for <cite>requests per second</cite>.</p> |
| <ul class="simple"> |
| <li><em>bpsSoftServiceLimit</em>: The soft limit for bps. Setting it to 0 or negative value will disable this feature. |
| By default it is disabled.</li> |
| <li><em>bpsHardServiceLimit</em>: The hard limit for bps. Setting it to 0 or negative value will disable this feature. |
| By default it is disabled.</li> |
| <li><em>rpsSoftServiceLimit</em>: The soft limit for rps. Setting it to 0 or negative value will disable this feature. |
| By default it is disabled.</li> |
| <li><em>rpsHardServiceLimit</em>: The hard limit for rps. Setting it to 0 or negative value will disable this feature. |
| By default it is disabled.</li> |
| </ul> |
| <p>There are two additional rate limiting settings that related to stream acquisitions.</p> |
| <ul class="simple"> |
| <li><em>rpsStreamAcquireServiceLimit</em>: The rate limit for rps. When the rps goes above this threshold, the write proxy |
| will stop accepting serving new streams.</li> |
| <li><em>bpsStreamAcquireServiceLimit</em>: The rate limit for bps. When the bps goes above this threshold, the write proxy |
| will stop accepting serving new streams.</li> |
| </ul> |
| </div> |
| <div class="section" id="stream-limit-settings"> |
| <h3>Stream Limit Settings<a class="headerlink" href="#stream-limit-settings" title="Permalink to this headline">¶</a></h3> |
| <p>This section describes the stream limit settings per write proxy. They are the constraints that each write proxy |
| will apply when deciding whether to own given streams.</p> |
| <ul class="simple"> |
| <li><em>maxAcquiredPartitionsPerProxy</em>: The maximum number of partitions per stream that a write proxy is allowed to |
| serve. Setting it to 0 or negative value will disable this feature. By default it is unlimited.</li> |
| <li><em>maxCachedPartitionsPerProxy</em>: The maximum number of partitions per stream that a write proxy is allowed to cache. |
| Setting it to 0 or negative value will disable this feature. By default it is unlimited.</li> |
| </ul> |
| </div> |
| </div> |
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| <li class="toctree-l2"><a class="reference internal" href="../design/main.html#consistency">Consistency</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../design/main.html#streaming-reads">Streaming Reads</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../design/main.html#logsegment-lifecycle">LogSegment Lifecycle</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="../globalreplicatedlog/main.html">Global Replicated Log</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="../globalreplicatedlog/main.html#region-aware-data-placement-policy">Region Aware Data Placement Policy</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../globalreplicatedlog/main.html#cross-region-speculative-reads">Cross Region Speculative Reads</a></li> |
| </ul> |
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| <li class="toctree-l2"><a class="reference internal" href="../operations/deployment.html">Cluster Setup & Deployment</a></li> |
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| <li class="toctree-l2"><a class="reference internal" href="../tutorials/main.html#messaging">Messaging</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../tutorials/main.html#replicated-state-machines">Replicated State Machines</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="../tutorials/main.html#analytics">Analytics</a></li> |
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| </li> |
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| <li class="toctree-l2"><a class="reference internal" href="../developer/release.html">Release</a></li> |
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| TimeMe.setCurrentPageName("my-home-page"); |
| TimeMe.initialize(); |
| |
| // record page visit event when user leaves the page |
| window.onbeforeunload = function (event) { |
| xmlhttp=new XMLHttpRequest(); |
| xmlhttp.withCredentials = true; |
| xmlhttp.open("POST", "/event/distributedlog:distributedlog/visit", false); |
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| border: 1px solid #ccc; |
| position: fixed; |
| bottom: 3px; |
| right: -280px; |
| z-index: 1; |
| } |
| #slidebox .close{ |
| margin-top: -5px; |
| opacity: 0.5; |
| } |
| #slidebox .close:hover{ |
| opacity: 0.7; |
| } |
| </style> --> |
| <script type="text/javascript"> |
| $(function() { |
| // $(window).scroll(function(){ |
| // var distanceTop = $('#last').offset().top - $(window).height(); |
| |
| // if ($(window).scrollTop() > distanceTop) |
| // $('#slidebox').animate({'right':'3px'},300); |
| // else |
| // $('#slidebox').stop(true).animate({'right':'-280px'},100); |
| // }); |
| |
| // $('#slidebox .close').bind('click',function(){ |
| // $(this).parent().remove(); |
| // }); |
| |
| $("#rateYo").rateYo({ |
| normalFill: "#A0A0A0", |
| halfStar: true, |
| rating: (Cookies.get('docbird.rating.distributedlog.distributedlog') || 0.0) |
| }).on("rateyo.set", function (e, data) { |
| var event_data = { |
| comment: '', // see todo note below |
| rating: data.rating, |
| page: window.location.href |
| }; |
| Cookies.get('docbird.rating.distributedlog.distributedlog', data.rating) |
| $.post('/event/distributedlog:distributedlog/rating', event_data) |
| // xmlhttp=new XMLHttpRequest(); |
| // xmlhttp.withCredentials = true; |
| // var event_data = { |
| // comment: '', // see todo note below |
| // rating: data.rating, |
| // page: window.location.href |
| // }; |
| // xmlhttp.open("GET", "/event/distributedlog/rating?" + $.param(event_data), false); |
| // xmlhttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); |
| // // todo: implement comment form in rating slide out, |
| // // and instead of hooking this event, include a submit button, |
| // // and read the rating with rating() method |
| |
| // // alert("send: " + $.param(event_data)); |
| // xmlhttp.send(); |
| |
| }); |
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| }); |
| </script> |
| <script src="_static/js/selection-sharer.js"></script> |
| <script> |
| $('.db-content-body').selectionSharer(); |
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