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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/common/meta/src/distributed_time_constants.rs`."><title>distributed_time_constants.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="common_meta" data-themes="" data-resource-suffix="" data-rustdoc-version="1.96.0-nightly (ac7f9ec7d 2026-03-20)" data-channel="nightly" data-search-js="search-63369b7b.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../static.files/storage-41dd4d93.js"></script><script defer src="../../static.files/src-script-813739b1.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-5013f961.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><h1><div class="sub-heading">common_meta/</div>distributed_time_constants.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="comment">// Copyright 2023 Greptime Team
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<a href=#2 id=2 data-nosnippet>2</a>//
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<a href=#3 id=3 data-nosnippet>3</a>// Licensed under the Apache License, Version 2.0 (the "License");
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<a href=#4 id=4 data-nosnippet>4</a>// you may not use this file except in compliance with the License.
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<a href=#5 id=5 data-nosnippet>5</a>// You may obtain a copy of the License at
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<a href=#6 id=6 data-nosnippet>6</a>//
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<a href=#7 id=7 data-nosnippet>7</a>// http://www.apache.org/licenses/LICENSE-2.0
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<a href=#8 id=8 data-nosnippet>8</a>//
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<a href=#9 id=9 data-nosnippet>9</a>// Unless required by applicable law or agreed to in writing, software
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<a href=#10 id=10 data-nosnippet>10</a>// distributed under the License is distributed on an "AS IS" BASIS,
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<a href=#11 id=11 data-nosnippet>11</a>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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<a href=#12 id=12 data-nosnippet>12</a>// See the License for the specific language governing permissions and
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<a href=#13 id=13 data-nosnippet>13</a>// limitations under the License.
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<a href=#14 id=14 data-nosnippet>14</a>
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<a href=#15 id=15 data-nosnippet>15</a></span><span class="kw">use </span>std::sync::OnceLock;
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<a href=#16 id=16 data-nosnippet>16</a><span class="kw">use </span>std::time::Duration;
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<a href=#17 id=17 data-nosnippet>17</a>
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<a href=#18 id=18 data-nosnippet>18</a><span class="kw">pub const </span>BASE_HEARTBEAT_INTERVAL: Duration = Duration::from_secs(<span class="number">3</span>);
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<a href=#19 id=19 data-nosnippet>19</a>
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<a href=#20 id=20 data-nosnippet>20</a><span class="doccomment">/// The lease seconds of metasrv leader.
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<a href=#21 id=21 data-nosnippet>21</a></span><span class="kw">pub const </span>META_LEASE_SECS: u64 = <span class="number">5</span>;
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<a href=#22 id=22 data-nosnippet>22</a>
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<a href=#23 id=23 data-nosnippet>23</a><span class="doccomment">/// The keep-alive interval of the Postgres connection.
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<a href=#24 id=24 data-nosnippet>24</a></span><span class="kw">pub const </span>POSTGRES_KEEP_ALIVE_SECS: u64 = <span class="number">30</span>;
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<a href=#25 id=25 data-nosnippet>25</a>
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<a href=#26 id=26 data-nosnippet>26</a><span class="doccomment">/// In a lease, there are two opportunities for renewal.
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<a href=#27 id=27 data-nosnippet>27</a></span><span class="kw">pub const </span>META_KEEP_ALIVE_INTERVAL_SECS: u64 = META_LEASE_SECS / <span class="number">2</span>;
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<a href=#28 id=28 data-nosnippet>28</a>
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<a href=#29 id=29 data-nosnippet>29</a><span class="doccomment">/// The timeout of the heartbeat request.
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<a href=#30 id=30 data-nosnippet>30</a></span><span class="kw">pub const </span>HEARTBEAT_TIMEOUT: Duration = Duration::from_secs(META_KEEP_ALIVE_INTERVAL_SECS + <span class="number">1</span>);
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<a href=#31 id=31 data-nosnippet>31</a>
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<a href=#32 id=32 data-nosnippet>32</a><span class="doccomment">/// The keep-alive interval of the heartbeat channel.
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<a href=#33 id=33 data-nosnippet>33</a></span><span class="kw">pub const </span>HEARTBEAT_CHANNEL_KEEP_ALIVE_INTERVAL_SECS: Duration = Duration::from_secs(<span class="number">15</span>);
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<a href=#34 id=34 data-nosnippet>34</a>
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<a href=#35 id=35 data-nosnippet>35</a><span class="doccomment">/// The keep-alive timeout of the heartbeat channel.
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<a href=#36 id=36 data-nosnippet>36</a></span><span class="kw">pub const </span>HEARTBEAT_CHANNEL_KEEP_ALIVE_TIMEOUT_SECS: Duration = Duration::from_secs(<span class="number">5</span>);
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<a href=#37 id=37 data-nosnippet>37</a>
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<a href=#38 id=38 data-nosnippet>38</a><span class="doccomment">/// The default mailbox round-trip timeout.
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<a href=#39 id=39 data-nosnippet>39</a></span><span class="kw">pub const </span>MAILBOX_RTT_SECS: u64 = <span class="number">1</span>;
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<a href=#40 id=40 data-nosnippet>40</a>
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<a href=#41 id=41 data-nosnippet>41</a><span class="doccomment">/// The interval of reporting topic stats.
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<a href=#42 id=42 data-nosnippet>42</a></span><span class="kw">pub const </span>TOPIC_STATS_REPORT_INTERVAL_SECS: u64 = <span class="number">15</span>;
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<a href=#43 id=43 data-nosnippet>43</a>
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<a href=#44 id=44 data-nosnippet>44</a><span class="doccomment">/// The retention seconds of topic stats.
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<a href=#45 id=45 data-nosnippet>45</a></span><span class="kw">pub const </span>TOPIC_STATS_RETENTION_SECS: u64 = TOPIC_STATS_REPORT_INTERVAL_SECS * <span class="number">100</span>;
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<a href=#46 id=46 data-nosnippet>46</a>
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<a href=#47 id=47 data-nosnippet>47</a><span class="attr">#[derive(Debug, Clone, Copy, PartialEq, Eq)]
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<a href=#48 id=48 data-nosnippet>48</a></span><span class="doccomment">/// The distributed time constants.
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<a href=#49 id=49 data-nosnippet>49</a></span><span class="kw">pub struct </span>DistributedTimeConstants {
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<a href=#50 id=50 data-nosnippet>50</a> <span class="kw">pub </span>heartbeat_interval: Duration,
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<a href=#51 id=51 data-nosnippet>51</a> <span class="kw">pub </span>frontend_heartbeat_interval: Duration,
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<a href=#52 id=52 data-nosnippet>52</a> <span class="kw">pub </span>region_lease: Duration,
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<a href=#53 id=53 data-nosnippet>53</a> <span class="kw">pub </span>datanode_lease: Duration,
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<a href=#54 id=54 data-nosnippet>54</a> <span class="kw">pub </span>flownode_lease: Duration,
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<a href=#55 id=55 data-nosnippet>55</a>}
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<a href=#56 id=56 data-nosnippet>56</a>
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<a href=#57 id=57 data-nosnippet>57</a><span class="doccomment">/// The frontend heartbeat interval is 6 times of the base heartbeat interval.
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<a href=#58 id=58 data-nosnippet>58</a></span><span class="kw">pub fn </span>frontend_heartbeat_interval(base_heartbeat_interval: Duration) -> Duration {
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<a href=#59 id=59 data-nosnippet>59</a> base_heartbeat_interval * <span class="number">6
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<a href=#60 id=60 data-nosnippet>60</a></span>}
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<a href=#61 id=61 data-nosnippet>61</a>
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<a href=#62 id=62 data-nosnippet>62</a><span class="kw">impl </span>DistributedTimeConstants {
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<a href=#63 id=63 data-nosnippet>63</a> <span class="doccomment">/// Create a new DistributedTimeConstants from the heartbeat interval.
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<a href=#64 id=64 data-nosnippet>64</a> </span><span class="kw">pub fn </span>from_heartbeat_interval(heartbeat_interval: Duration) -> <span class="self">Self </span>{
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<a href=#65 id=65 data-nosnippet>65</a> <span class="kw">let </span>region_lease = heartbeat_interval * <span class="number">3 </span>+ Duration::from_secs(<span class="number">1</span>);
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<a href=#66 id=66 data-nosnippet>66</a> <span class="kw">let </span>datanode_lease = region_lease;
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<a href=#67 id=67 data-nosnippet>67</a> <span class="kw">let </span>flownode_lease = datanode_lease;
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<a href=#68 id=68 data-nosnippet>68</a> <span class="self">Self </span>{
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<a href=#69 id=69 data-nosnippet>69</a> heartbeat_interval,
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<a href=#70 id=70 data-nosnippet>70</a> frontend_heartbeat_interval: frontend_heartbeat_interval(heartbeat_interval),
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<a href=#71 id=71 data-nosnippet>71</a> region_lease,
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<a href=#72 id=72 data-nosnippet>72</a> datanode_lease,
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<a href=#73 id=73 data-nosnippet>73</a> flownode_lease,
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<a href=#74 id=74 data-nosnippet>74</a> }
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<a href=#75 id=75 data-nosnippet>75</a> }
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<a href=#76 id=76 data-nosnippet>76</a>}
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<a href=#77 id=77 data-nosnippet>77</a>
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<a href=#78 id=78 data-nosnippet>78</a><span class="kw">impl </span>Default <span class="kw">for </span>DistributedTimeConstants {
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<a href=#79 id=79 data-nosnippet>79</a> <span class="kw">fn </span>default() -> <span class="self">Self </span>{
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<a href=#80 id=80 data-nosnippet>80</a> <span class="self">Self</span>::from_heartbeat_interval(BASE_HEARTBEAT_INTERVAL)
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<a href=#81 id=81 data-nosnippet>81</a> }
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<a href=#82 id=82 data-nosnippet>82</a>}
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<a href=#83 id=83 data-nosnippet>83</a>
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<a href=#84 id=84 data-nosnippet>84</a><span class="kw">static </span>DEFAULT_DISTRIBUTED_TIME_CONSTANTS: OnceLock<DistributedTimeConstants> = OnceLock::new();
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<a href=#85 id=85 data-nosnippet>85</a>
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<a href=#86 id=86 data-nosnippet>86</a><span class="doccomment">/// Get the default distributed time constants.
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<a href=#87 id=87 data-nosnippet>87</a></span><span class="kw">pub fn </span>default_distributed_time_constants() -> <span class="kw-2">&</span><span class="lifetime">'static </span>DistributedTimeConstants {
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<a href=#88 id=88 data-nosnippet>88</a> DEFAULT_DISTRIBUTED_TIME_CONSTANTS.get_or_init(Default::default)
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<a href=#89 id=89 data-nosnippet>89</a>}
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<a href=#90 id=90 data-nosnippet>90</a>
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<a href=#91 id=91 data-nosnippet>91</a><span class="doccomment">/// Initialize the default distributed time constants.
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<a href=#92 id=92 data-nosnippet>92</a></span><span class="kw">pub fn </span>init_distributed_time_constants(base_heartbeat_interval: Duration) {
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<a href=#93 id=93 data-nosnippet>93</a> <span class="kw">let </span>distributed_time_constants =
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<a href=#94 id=94 data-nosnippet>94</a> DistributedTimeConstants::from_heartbeat_interval(base_heartbeat_interval);
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<a href=#95 id=95 data-nosnippet>95</a> DEFAULT_DISTRIBUTED_TIME_CONSTANTS
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<a href=#96 id=96 data-nosnippet>96</a> .set(distributed_time_constants)
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<a href=#97 id=97 data-nosnippet>97</a> .expect(<span class="string">"Failed to set default distributed time constants"</span>);
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<a href=#98 id=98 data-nosnippet>98</a> <span class="macro">common_telemetry::info!</span>(
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<a href=#99 id=99 data-nosnippet>99</a> <span class="string">"Initialized default distributed time constants: {:#?}"</span>,
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<a href=#100 id=100 data-nosnippet>100</a> distributed_time_constants
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<a href=#101 id=101 data-nosnippet>101</a> );
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<a href=#102 id=102 data-nosnippet>102</a>}
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</code></pre></div></section></main></body></html> |