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The following commit(s) were added to refs/heads/33.0.0 by this push:
new 6e630c000c0 Docs: Update segment metadata cache metrics (#17896)
6e630c000c0 is described below
commit 6e630c000c017b50d6c9162274abe4656e02041f
Author: Kashif Faraz <[email protected]>
AuthorDate: Thu Apr 10 13:34:27 2025 +0530
Docs: Update segment metadata cache metrics (#17896)
(cherry picked from commit 94b147285ede1339da13081850f4ce9fdd5dcfec)
---
docs/operations/metrics.md | 10 +++++++---
.../java/org/apache/druid/metadata/segment/cache/Metric.java | 2 +-
2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/docs/operations/metrics.md b/docs/operations/metrics.md
index 08e90d5baf5..af59687e10d 100644
--- a/docs/operations/metrics.md
+++ b/docs/operations/metrics.md
@@ -333,15 +333,19 @@ The following metrics are emitted only when [segment
metadata caching](../config
|Metric|Description|Dimensions|
|------|-----------|----------|
|`segment/used/count`|Number of used segments currently present in the
metadata store.|`dataSource`|
-|`segment/unused/count`|Number of unused segments currently present in the
metadata store.|`dataSource`|
|`segment/pending/count`|Number of pending segments currently present in the
metadata store.|`dataSource`|
-|`segment/metadataCache/transactions`|Number of read or write transactions
performed on the cache for a single datasource.|`dataSource`|
+|`segment/metadataCache/interval/count`|Total number of intervals present in
the cache for a single datasource.|`dataSource`|
+|`segment/metadataCache/used/count`|Total number of used segments present in
the cache for a single datasource.|`dataSource`|
+|`segment/metadataCache/pending/count`|Total number of pending segments
present in the cache for a single datasource.|`dataSource`|
+|`segment/metadataCache/transactions/readOnly`|Number of read-only
transactions performed on the cache for a single datasource.|`dataSource`|
+|`segment/metadataCache/transactions/readWrite`|Number of read-write
transactions performed on the cache for a single datasource.|`dataSource`|
+|`segment/metadataCache/transactions/writeOnly`|Number of write-only
transactions performed on the cache for a single datasource. These transactions
happen only if the cache is operating in mode `ifSynced` and the first sync on
the leader Overlord is not complete yet.|`dataSource`|
|`segment/metadataCache/sync/time`|Number of milliseconds taken for the cache
to sync with the metadata store.||
+|`segment/metadataCache/dataSource/deleted`|Indicates that a datasource has no
used or pending segments anymore and has been removed from the
cache.|`dataSource`|
|`segment/metadataCache/deleted`|Total number of segments deleted from the
cache during the latest sync.||
|`segment/metadataCache/skipped`|Total number of unparseable segment records
that were skipped in the latest sync.||
|`segment/metadataCache/used/stale`|Number of used segments in the cache which
are out-of-date and need to be refreshed.|`dataSource`|
|`segment/metadataCache/used/updated`|Number of used segments updated in the
cache during the latest sync.|`dataSource`|
-|`segment/metadataCache/unused/updated`|Number of unused segments updated in
the cache during the latest sync.|`dataSource`|
|`segment/metadataCache/pending/deleted`|Number of pending segments deleted
from the cache during the latest sync.|`dataSource`|
|`segment/metadataCache/pending/updated`|Number of pending segments updated in
the cache during the latest sync.|`dataSource`|
|`segment/metadataCache/pending/skipped`|Number of unparseable pending segment
records that were skipped in the latest sync.|`dataSource`|
diff --git
a/server/src/main/java/org/apache/druid/metadata/segment/cache/Metric.java
b/server/src/main/java/org/apache/druid/metadata/segment/cache/Metric.java
index 24f4fd8efa5..adaec00e991 100644
--- a/server/src/main/java/org/apache/druid/metadata/segment/cache/Metric.java
+++ b/server/src/main/java/org/apache/druid/metadata/segment/cache/Metric.java
@@ -109,7 +109,7 @@ public class Metric
// CACHE UPDATE METRICS
/**
- * Total number of segments deleted from the cache in the latest sync.
+ * Total number of datasources removed from the cache if they have no
segments anymore.
*/
public static final String DELETED_DATASOURCES = METRIC_NAME_PREFIX +
"dataSource/deleted";
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