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| <section id="manifest-entry-cache"> |
| <h1>Manifest Entry Cache<a class="headerlink" href="#manifest-entry-cache" title="Link to this heading">#</a></h1> |
| <section id="overview"> |
| <h2>Overview<a class="headerlink" href="#overview" title="Link to this heading">#</a></h2> |
| <p>Large tables may contain many manifest entries, while a scan may only need a |
| small subset after bucket, partition, and statistics pruning. The snapshot live |
| manifest entry cache reduces repeated manifest decoding cost for successive full |
| scans that target the same bucket.</p> |
| <p>The cache stores decoded and merged live manifest entries by table path, branch, |
| and bucket for <code class="docutils literal notranslate"><span class="pre">ScanMode::ALL</span></code>. Each cache value can retain several snapshot |
| results for that bucket. Exact snapshot hits are served from the cache; cache |
| misses rebuild the target snapshot bucket from the target snapshot’s data |
| manifests and store the rebuilt live entries.</p> |
| <p>Request-specific filters are not stored in the cache. Partition, level, and |
| predicate filters are still evaluated for each scan, so cached entries can be |
| reused safely across different scan predicates for the same bucket.</p> |
| </section> |
| <section id="configuration"> |
| <h2>Configuration<a class="headerlink" href="#configuration" title="Link to this heading">#</a></h2> |
| <p>Manifest entry caching reuses the cache instance provided by |
| <code class="docutils literal notranslate"><span class="pre">ScanContextBuilder::WithCache()</span></code> and stores bucket-scoped snapshot entries |
| under |
| <code class="docutils literal notranslate"><span class="pre">CacheKind::SNAPSHOT_LIVE_MANIFEST</span></code>:</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="k">auto</span><span class="w"> </span><span class="n">cache</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">make_shared</span><span class="o"><</span><span class="n">LruCache</span><span class="o">></span><span class="p">(</span><span class="mi">128</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">1024</span><span class="w"> </span><span class="o">*</span><span class="w"> </span><span class="mi">1024</span><span class="p">);</span> |
| <span class="n">ScanContextBuilder</span><span class="w"> </span><span class="nf">context_builder</span><span class="p">(</span><span class="n">table_path</span><span class="p">);</span> |
| <span class="n">PAIMON_ASSIGN_OR_RAISE</span><span class="p">(</span> |
| <span class="w"> </span><span class="n">std</span><span class="o">::</span><span class="n">unique_ptr</span><span class="o"><</span><span class="n">ScanContext</span><span class="o">></span><span class="w"> </span><span class="n">scan_context</span><span class="p">,</span> |
| <span class="w"> </span><span class="n">context_builder</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">WithCache</span><span class="p">(</span><span class="n">cache</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">AddOption</span><span class="p">(</span><span class="n">Options</span><span class="o">::</span><span class="n">SCAN_MANIFEST_ENTRY_CACHE_MAX_SNAPSHOTS</span><span class="p">,</span><span class="w"> </span><span class="s">"3"</span><span class="p">)</span> |
| <span class="w"> </span><span class="p">.</span><span class="n">Finish</span><span class="p">());</span> |
| </pre></div> |
| </div> |
| <p>Cache entries are scoped by table path, branch, and bucket, so they can be |
| reused across newly created <code class="docutils literal notranslate"><span class="pre">TableScan</span></code> and <code class="docutils literal notranslate"><span class="pre">FileStoreScan</span></code> instances as |
| long as they share the same cache object and scan the same bucket.</p> |
| <p><code class="docutils literal notranslate"><span class="pre">Options::SCAN_MANIFEST_ENTRY_CACHE_MAX_SNAPSHOTS</span></code> controls how many snapshot |
| results are retained in each table/branch/bucket cache value. Older snapshots in |
| the same bucket are evicted first. The default value is <code class="docutils literal notranslate"><span class="pre">0</span></code>, which disables |
| the cache path. Set it to a positive value to enable the cache when |
| <code class="docutils literal notranslate"><span class="pre">ScanContextBuilder::WithCache()</span></code> is also configured. Physical cache eviction |
| is still controlled by the configured <code class="docutils literal notranslate"><span class="pre">Cache</span></code> implementation, for example the |
| capacity of <code class="docutils literal notranslate"><span class="pre">LruCache</span></code>.</p> |
| <p>If no cache is provided through <code class="docutils literal notranslate"><span class="pre">ScanContextBuilder::WithCache()</span></code>, this |
| optimization is skipped. The snapshot manifest entry cache shares the same |
| <code class="docutils literal notranslate"><span class="pre">Cache</span></code> interface with raw manifest and data-file footer caches, but it uses a |
| dedicated <code class="docutils literal notranslate"><span class="pre">CacheKind</span></code> and a table/branch/bucket key instead of file byte |
| ranges.</p> |
| </section> |
| <section id="limitations"> |
| <h2>Limitations<a class="headerlink" href="#limitations" title="Link to this heading">#</a></h2> |
| <p>The cache is currently used only for <code class="docutils literal notranslate"><span class="pre">ScanMode::ALL</span></code> scans that can determine |
| a single target bucket. It is skipped for scans without a bucket filter because |
| reading or deserializing all buckets would be too expensive for selective |
| queries. It is also skipped for row-range scans because row-range pruning is |
| applied at manifest-meta level.</p> |
| </section> |
| <section id="metrics"> |
| <h2>Metrics<a class="headerlink" href="#metrics" title="Link to this heading">#</a></h2> |
| <p>The scan metrics expose existing counters for the last scan:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">lastScannedManifests</span></code>: how many manifest files were loaded during this |
| scan before manifest entry decoding.</p></li> |
| </ul> |
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