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| <p class="topic-title first">Per Stream Configuration</p> |
| <ul class="simple"> |
| <li><a class="reference internal" href="#id1" id="id2">Per Stream Configuration</a><ul> |
| <li><a class="reference internal" href="#dynamic-configuration" id="id3">Dynamic Configuration</a><ul> |
| <li><a class="reference internal" href="#file-based-dynamic-configuration" id="id4">File Based Dynamic Configuration</a></li> |
| <li><a class="reference internal" href="#stream-config-provider" id="id5">Stream Config Provider</a></li> |
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| <li><a class="reference internal" href="#transmit-settings" id="id8">Transmit Settings</a></li> |
| <li><a class="reference internal" href="#durability-settings" id="id9">Durability Settings</a></li> |
| <li><a class="reference internal" href="#readahead-settings" id="id10">ReadAhead Settings</a></li> |
| <li><a class="reference internal" href="#rate-limit-settings" id="id11">Rate Limit Settings</a></li> |
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| <div class="section" id="id1"> |
| <h2><a class="toc-backref" href="#id2">Per Stream Configuration</a></h2> |
| <p>Application is allowed to override <cite>DistributedLogConfiguration</cite> for individual streams. This is archieved |
| for supplying an overrided <cite>DistributedLogConfiguration</cite> when opening the distributedlog manager.</p> |
| <pre class="literal-block"> |
| DistributedLogNamespace namespace = ...; |
| DistributedLogConfiguration perStreamConf = new DistributeLogConfiguration(); |
| perStreamConf.loadConf(...); // load configuration from a per stream configuration file |
| DistributedLogManager dlm = namespace.openLog("test-stream", Optional.of(perStreamConf), Optional.absent()); |
| </pre> |
| <div class="section" id="dynamic-configuration"> |
| <h3><a class="toc-backref" href="#id3">Dynamic Configuration</a></h3> |
| <p>Besides overriding normal <cite>DistributedLogConfiguration</cite> with per stream configuration, DistributedLog also |
| provides loading some configuration settings dynamically. The per stream dynamic settings are offered in |
| <cite>DynamicDistributedLogConfiguration</cite>.</p> |
| <div class="section" id="file-based-dynamic-configuration"> |
| <h4><a class="toc-backref" href="#id4">File Based Dynamic Configuration</a></h4> |
| <p>The default dynamic configuration implementation is based on properties files and reloading the file periodically.</p> |
| <pre class="literal-block"> |
| ConcurrentBaseConfiguration defaultConf = ...; // base config to fall through |
| int reloadPeriod = 60; // 60 seconds |
| TimeUnit reloadUnit = TimeUnit.SECOND; |
| String configPath = "/path/to/per/stream/config/file"; |
| File configFile = new File(configPath); |
| // load the fie into a properties configuration builder |
| PropertiesConfigurationBuilder properties = |
| new PropertiesConfigurationBuilder(configFile.toURI().toURL()); |
| // Construct the dynamic configuration |
| DynamicDistributedLogConfiguration dynConf = new DynamicDistributedLogConfiguration(defaultConf); |
| // add a configuration subscription to periodically reload the config from the file |
| ConfigurationSubscription subscription = |
| new ConfigurationSubscription(dynConf, properties, executorService, reloadPeriod, reloadUnit); |
| </pre> |
| </div> |
| <div class="section" id="stream-config-provider"> |
| <h4><a class="toc-backref" href="#id5">Stream Config Provider</a></h4> |
| <p>The stream config provider is designed to manage and reload dynamic configs for individual streams.</p> |
| <pre class="literal-block"> |
| String perStreamConfigDir = "/path/to/per/stream/config/dir"; |
| String defaultConfigPath = "/path/to/default/config/file"; |
| StreamPartitionConverter converter = ...; |
| ScheduledExecutorService scheduler = ...; |
| int reloadPeriod = 60; // 60 seconds |
| TimeUnit reloadUnit = TimeUnit.SECOND; |
| StreamConfigProvider provider = new ServiceStreamConfigProvider( |
| perStreamConfigDir, |
| defaultConfigPath, |
| converter, |
| scheduler, |
| reloadPeriod, |
| reloadUnit); |
| |
| Optional<DynamicDistributedLogConfiguration> streamConf = provider.getDynamicStreamConfig("test-stream"); |
| </pre> |
| <ul class="simple"> |
| <li><em>perStreamConfigDir</em>: The directory contains configuration files for each stream. the file name is <cite><stream_name>.conf</cite>.</li> |
| <li><em>defaultConfigPath</em>: The default configuration file. If there is no stream configuration file found in <cite>perStreamConfigDir</cite>, |
| it would load the configuration from <cite>defaultConfigPath</cite>.</li> |
| <li><em>StreamPartitionConverter</em>: A converter that convert the stream names to partitions. DistributedLog doesn't provide built-in |
| partitions. It leaves partition strategy to application. Application usually put the partition id in the dl stream name. So the |
| converter is for group the streams and apply same configuration. For example, if application uses 3 streams and names them as |
| <cite>test-stream_000001</cite>, <cite>test-stream_000002</cite> and <cite>test-stream_000003</cite>, a <cite>StreamPartitionConverter</cite> could be used to categorize them |
| as partitions for stream <cite>test-stream</cite> and apply the configuration from file <cite>test-stream.conf</cite>.</li> |
| <li><em>scheduler</em>: The executor service that reloads configuration periodically.</li> |
| <li><em>reloadPeriod</em>: The reload period, in <cite>reloadUnit</cite>.</li> |
| </ul> |
| </div> |
| <div class="section" id="available-dynamic-settings"> |
| <h4><a class="toc-backref" href="#id6">Available Dynamic Settings</a></h4> |
| </div> |
| <div class="section" id="storage-settings"> |
| <h4><a class="toc-backref" href="#id7">Storage Settings</a></h4> |
| <ul class="simple"> |
| <li><em>logSegmentRetentionHours</em>: The log segment retention period, in hours. In other words, how long should DL keep the log segment once it is <cite>truncated</cite> or <cite>completed</cite>.</li> |
| <li><em>bkcEnsembleSize</em>: The ensemble size of the log segment. The default value is 3.</li> |
| <li><em>bkcWriteQuorumSize</em>: The write quorum size of the log segment. The default value is 3.</li> |
| <li><em>bkcAckQuorumSize</em>: The ack quorumm size of the log segment. The default value is 2.</li> |
| </ul> |
| </div> |
| <div class="section" id="transmit-settings"> |
| <h4><a class="toc-backref" href="#id8">Transmit Settings</a></h4> |
| <ul class="simple"> |
| <li><em>writerOutputBufferSize</em>: The output buffer size in bytes. Larger buffer size will result in higher compression ratio and |
| it would reduce the entries sent to bookkeeper, use the disk bandwidth more efficiently and improve throughput. |
| Set this setting to <cite>0</cite> will ask DL to transmit the data immediately, which it would achieve low latency.</li> |
| </ul> |
| </div> |
| <div class="section" id="durability-settings"> |
| <h4><a class="toc-backref" href="#id9">Durability Settings</a></h4> |
| <ul class="simple"> |
| <li><em>isDurableWriteEnabled</em>: The flag indicates whether durable write is enabled. By default it is true.</li> |
| </ul> |
| </div> |
| <div class="section" id="readahead-settings"> |
| <h4><a class="toc-backref" href="#id10">ReadAhead Settings</a></h4> |
| <ul class="simple"> |
| <li><em>readAheadMaxRecords</em>: The maximum number of records that will be cached in readahead cache by the DL readers. The default value |
| is 10. A higher value will improve throughput but use more memory. It should be tuned properly to avoid jvm gc if the reader cannot |
| keep up with the writing rate.</li> |
| <li><em>readAheadBatchSize</em>: The maximum number of entries that readahead worker will read in one batch. The default value is 2. |
| Increase the value to increase the concurrency of reading entries from bookkeeper. It is recommended to tune to a proper value for |
| catching up readers, not to exhaust bookkeeper's bandwidth.</li> |
| </ul> |
| </div> |
| <div class="section" id="rate-limit-settings"> |
| <h4><a class="toc-backref" href="#id11">Rate Limit Settings</a></h4> |
| <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>bpsSoftWriteLimit</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>bpsHardWriteLimit</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>rpsSoftWriteLimit</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>rpsHardWriteLimit</em>: The hard limit for rps. Setting it to 0 or negative value will disable this feature. |
| By default it is disabled.</li> |
| </ul> |
| </div> |
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