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| <p class="topic-title first">Write Proxy Configuration</p> |
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| <li><a class="reference internal" href="#id1" id="id2">Write Proxy Configuration</a><ul> |
| <li><a class="reference internal" href="#server-configuration-settings" id="id3">Server Configuration Settings</a><ul> |
| <li><a class="reference internal" href="#rate-limit-settings" id="id4">Rate Limit Settings</a></li> |
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| <div class="section" id="id1"> |
| <h2><a class="toc-backref" href="#id2">Write Proxy Configuration</a></h2> |
| <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"> |
| <h3><a class="toc-backref" href="#id3">Server Configuration Settings</a></h3> |
| <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"> |
| <h4><a class="toc-backref" href="#id4">Rate Limit Settings</a></h4> |
| <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"> |
| <h4><a class="toc-backref" href="#id5">Stream Limit Settings</a></h4> |
| <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> |
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