fredia commented on code in PR #25884:
URL: https://github.com/apache/flink/pull/25884#discussion_r1912767509
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docs/content/docs/ops/metrics.md:
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@@ -1526,6 +1526,41 @@ Note that for failed checkpoints, metrics are updated on
a best efforts basis an
### RocksDB
Certain RocksDB native metrics are available but disabled by default, you can
find full documentation [here]({{< ref "docs/deployment/config"
>}}#rocksdb-native-metrics)
+### ForStDB
+<table class="table table-bordered">
+ <thead>
+ <tr>
+ <th class="text-left" style="width: 18%">Scope</th>
+ <th class="text-left" style="width: 26%">Metrics</th>
+ <th class="text-left" style="width: 48%">Description</th>
+ <th class="text-left" style="width: 8%">Type</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <th rowspan="4"><strong>Task/Operator</strong></th>
+ <td>forst.fileCache.hit</td>
+ <td>The hit count of ForSt state backend cache.</td>
Review Comment:
> I am not sure how the invalidation occurs - can you count the number of
invalidations in a similar way to the hits and misses.
I think "invalidations" == "misses" for a cache. Take a fixed-sized FIFO
cache as example, when the requested data is not found in the cache, a "miss(or
invalidations )" happens. Due to limited size of the cache, if the cache is
full and new data needs to be added, the oldest data (first-in) will be
replaced. If this removed data is needed again later, it results in a miss.
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