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[server] Add metrics of log startOffset #3229

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Merged
luoyuxia merged 3 commits into from
May 8, 2026
Merged

[server] Add metrics of log startOffset #3229

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e8b8702
[server] Add metrics of log startOffset
Apr 29, 2026
8b1434e
fix comments
May 8, 2026
7c66fcb
follow again
May 8, 2026
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1 change: 1 addition & 0 deletions fluss-common/src/main/java/org/apache/fluss/metrics/MetricNames.java
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Original file line number Diff line number Diff line change
Expand Up @@ -229,6 +229,7 @@ public class MetricNames {

// for log tablet
public static final String LOG_NUM_SEGMENTS = "numSegments";
public static final String LOG_START_OFFSET = "startOffset";
public static final String LOG_END_OFFSET = "endOffset";
public static final String REMOTE_LOG_SIZE = "size";
public static final String LOG_LAKE_TIMESTAMP_LAG = "timestampLag";
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1 change: 1 addition & 0 deletions fluss-server/src/main/java/org/apache/fluss/server/log/LogTablet.java
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Expand Up @@ -355,6 +355,7 @@ public void registerMetrics(BucketMetricGroup bucketMetricGroup) {
MetricGroup metricGroup = bucketMetricGroup.addGroup("log");
metricGroup.gauge(
MetricNames.LOG_NUM_SEGMENTS, () -> localLog.getSegments().numberOfSegments());
metricGroup.gauge(MetricNames.LOG_START_OFFSET, localLog::getLocalLogStartOffset);
metricGroup.gauge(MetricNames.LOG_END_OFFSET, localLog::getLocalLogEndOffset);
}

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8 changes: 8 additions & 0 deletions fluss-server/src/main/java/org/apache/fluss/server/log/remote/RemoteLogTablet.java
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Expand Up @@ -121,6 +121,14 @@ public void registerMetrics(BucketMetricGroup bucketMetricGroup) {
}
MetricGroup metricGroup = bucketMetricGroup.addGroup("remoteLog");
metricGroup.gauge(MetricNames.LOG_NUM_SEGMENTS, () -> numRemoteLogSegments);
metricGroup.gauge(
MetricNames.LOG_START_OFFSET,
() -> {
if (remoteLogStartOffset == INIT_REMOTE_LOG_START_OFFSET) {
return -1L;
}
return remoteLogStartOffset;
});
metricGroup.gauge(MetricNames.LOG_END_OFFSET, () -> remoteLogEndOffset);
metricGroup.gauge(MetricNames.REMOTE_LOG_SIZE, this::getRemoteSizeInBytes);
remoteLogMetrics = metricGroup;
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10 changes: 10 additions & 0 deletions website/docs/maintenance/observability/monitor-metrics.md
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Expand Up @@ -851,6 +851,11 @@ Some metrics might not be exposed when using other JVM implementations (e.g. IBM
<td>numSegments</td>
<td>The number of segments in local storage for this table bucket.</td>
<td>Gauge</td>
</tr>
<tr>
<td>startOffset</td>
<td>The start offset in local storage for this table bucket.</td>
<td>Gauge</td>
</tr>
<tr>
<td>endOffset</td>
Expand All @@ -873,6 +878,11 @@ Some metrics might not be exposed when using other JVM implementations (e.g. IBM
<td>numSegments</td>
<td>The number of segments in remote storage for this table bucket.</td>
<td>Gauge</td>
</tr>
<tr>
<td>startOffset</td>
<td>The start offset in remote storage for this table bucket.</td>
<td>Gauge</td>
</tr>
<tr>
<td>endOffset</td>
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