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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="API documentation for the Rust `metadata_region` mod in crate `metric_engine`."><title>metric_engine::metadata_region - Rust</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="metric_engine" 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="../sidebar-items.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 mod"><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]--><rustdoc-topbar><h2><a href="#">Module metadata_region</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../metric_engine/index.html">metric_<wbr>engine</a><span class="version">1.0.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module metadata_<wbr>region</a></h2><h3><a href="#structs">Module Items</a></h3><ul class="block"><li><a href="#structs" title="Structs">Structs</a></li><li><a href="#constants" title="Constants">Constants</a></li><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate metric_<wbr>engine</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">metric_engine</a></div><h1>Module <span>metadata_<wbr>region</span> <button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/metric_engine/metadata_region.rs.html#15-887">Source</a> </span></div><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><dl class="item-table"><dt><a class="struct" href="struct.MetadataRegion.html" title="struct metric_engine::metadata_region::MetadataRegion">Metadata<wbr>Region</a></dt><dd>The other two fields key and value will be used as a k-v storage.
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It contains two group of key:</dd><dt><a class="struct" href="struct.RegionMetadataCacheEntry.html" title="struct metric_engine::metadata_region::RegionMetadataCacheEntry">Region<wbr>Metadata<wbr>Cache<wbr>Entry</a><span title="Restricted Visibility"> 🔒</span> </dt></dl><h2 id="constants" class="section-header">Constants<a href="#constants" class="anchor">§</a></h2><dl class="item-table"><dt><a class="constant" href="constant.CACHE_TTL.html" title="constant metric_engine::metadata_region::CACHE_TTL">CACHE_<wbr>TTL</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>The TTL of the region metadata cache.</dd><dt><a class="constant" href="constant.COLUMN_PREFIX.html" title="constant metric_engine::metadata_region::COLUMN_PREFIX">COLUMN_<wbr>PREFIX</a><span title="Restricted Visibility"> 🔒</span> </dt><dt><a class="constant" href="constant.MAX_CACHE_SIZE.html" title="constant metric_engine::metadata_region::MAX_CACHE_SIZE">MAX_<wbr>CACHE_<wbr>SIZE</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>The max size of the region metadata cache.</dd><dt><a class="constant" href="constant.REGION_PREFIX.html" title="constant metric_engine::metadata_region::REGION_PREFIX">REGION_<wbr>PREFIX</a><span title="Restricted Visibility"> 🔒</span> </dt></dl><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><dl class="item-table"><dt><a class="fn" href="fn.decode_batch_stream.html" title="fn metric_engine::metadata_region::decode_batch_stream">decode_<wbr>batch_<wbr>stream</a></dt><dd>Decode a record batch stream to a stream of items.</dd><dt><a class="fn" href="fn.decode_record_batch_to_key.html" title="fn metric_engine::metadata_region::decode_record_batch_to_key">decode_<wbr>record_<wbr>batch_<wbr>to_<wbr>key</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>Decode a record batch to a list of key.</dd><dt><a class="fn" href="fn.decode_record_batch_to_key_and_value.html" title="fn metric_engine::metadata_region::decode_record_batch_to_key_and_value">decode_<wbr>record_<wbr>batch_<wbr>to_<wbr>key_<wbr>and_<wbr>value</a><span title="Restricted Visibility"> 🔒</span> </dt><dd>Decode a record batch to a list of key and value.</dd><dt><a class="fn" href="fn.get_all_with_prefix.html" title="fn metric_engine::metadata_region::get_all_with_prefix">get_<wbr>all_<wbr>with_<wbr>prefix</a><span title="Restricted Visibility"> 🔒</span> </dt></dl></section></div></main></body></html> |