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fix(pagination): add insert_id UUID tiebreak to cursor keyset
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Same-millisecond rows were silently skipped between pages because the
log cursor had no tiebreak and the events cursor tied by instance_id
(which also collides when one instance emits multiple events within a
millisecond). Add an insert_id UUID (DEFAULT generateUUIDv4()) column
to both logs and agent_events, order by (timestamp, insert_id)
consistently, and encode the cursor as 'timestamp|insert_id'. Existing
data is materialized via ALTER TABLE MATERIALIZE COLUMN (one-time
background mutation).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
hsiegeln
2026-04-17 14:25:36 +02:00
parent 07dbfb1391
commit 89c9b53edd
5 changed files with 103 additions and 41 deletions
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37
cameleer-server-app/src/main/java/com/cameleer/server/app/search/ClickHouseLogStore.java
View File

@@ -10,8 +10,10 @@ import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jdbc.core.JdbcTemplate;
import java.nio.charset.StandardCharsets;
import java.time.Instant;
import java.util.ArrayList;
import java.util.Base64;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
@@ -176,13 +178,26 @@ public class ClickHouseLogStore implements LogIndex {
}
if (request.cursor() != null && !request.cursor().isEmpty()) {
Instant cursorTs = Instant.parse(request.cursor());
if ("asc".equalsIgnoreCase(request.sort())) {
dataConditions.add("timestamp > parseDateTime64BestEffort(?, 3)");
} else {
dataConditions.add("timestamp < parseDateTime64BestEffort(?, 3)");
String decoded = new String(Base64.getUrlDecoder().decode(request.cursor()),
StandardCharsets.UTF_8);
int bar = decoded.indexOf('|');
if (bar <= 0 || bar == decoded.length() - 1) {
throw new IllegalArgumentException("Malformed cursor");
}
Instant cursorTs;
try {
cursorTs = Instant.parse(decoded.substring(0, bar));
} catch (java.time.format.DateTimeParseException e) {
throw new IllegalArgumentException("Malformed cursor", e);
}
String cursorId = decoded.substring(bar + 1);
String cmp = "asc".equalsIgnoreCase(request.sort()) ? ">" : "<";
dataConditions.add(
"(timestamp " + cmp + " parseDateTime64BestEffort(?, 3)" +
" OR (timestamp = parseDateTime64BestEffort(?, 3) AND insert_id " + cmp + " toUUID(?)))");
dataParams.add(cursorTs.toString());
dataParams.add(cursorTs.toString());
dataParams.add(cursorId);
}
String dataWhere = String.join(" AND ", dataConditions);
@@ -192,11 +207,12 @@ public class ClickHouseLogStore implements LogIndex {
String dataSql = "SELECT formatDateTime(timestamp, '%Y-%m-%dT%H:%i:%S', 'UTC') AS ts_utc," +
" toUnixTimestamp64Milli(timestamp) AS ts_millis," +
" level, logger_name, message, thread_name, stack_trace, " +
"exchange_id, instance_id, application, mdc, source " +
"exchange_id, instance_id, application, mdc, source, toString(insert_id) AS insert_id_str " +
"FROM logs WHERE " + dataWhere +
" ORDER BY timestamp " + orderDir + " LIMIT ?";
" ORDER BY timestamp " + orderDir + ", insert_id " + orderDir + " LIMIT ?";
dataParams.add(fetchLimit);
List<String> insertIds = new ArrayList<>();
List<LogEntryResult> results = jdbc.query(dataSql, dataParams.toArray(), (rs, rowNum) -> {
long tsMillis = rs.getLong("ts_millis");
String timestampStr = Instant.ofEpochMilli(tsMillis).toString();
@@ -207,6 +223,8 @@ public class ClickHouseLogStore implements LogIndex {
String source = rs.getString("source");
insertIds.add(rs.getString("insert_id_str"));
return new LogEntryResult(
timestampStr,
rs.getString("level"),
@@ -229,7 +247,10 @@ public class ClickHouseLogStore implements LogIndex {
String nextCursor = null;
if (hasMore && !results.isEmpty()) {
nextCursor = results.get(results.size() - 1).timestamp();
int lastIdx = results.size() - 1;
String raw = results.get(lastIdx).timestamp() + "|" + insertIds.get(lastIdx);
nextCursor = Base64.getUrlEncoder().withoutPadding()
.encodeToString(raw.getBytes(StandardCharsets.UTF_8));
}
return new LogSearchResponse(results, nextCursor, hasMore, levelCounts);

35
cameleer-server-app/src/main/java/com/cameleer/server/app/storage/ClickHouseAgentEventRepository.java
View File

@@ -24,7 +24,7 @@ public class ClickHouseAgentEventRepository implements AgentEventRepository {
"INSERT INTO agent_events (tenant_id, instance_id, application_id, environment, event_type, detail) VALUES (?, ?, ?, ?, ?, ?)";
private static final String SELECT_BASE =
"SELECT 0 AS id, instance_id, application_id, event_type, detail, timestamp FROM agent_events WHERE tenant_id = ?";
"SELECT 0 AS id, instance_id, application_id, event_type, detail, timestamp, toString(insert_id) AS insert_id_str FROM agent_events WHERE tenant_id = ?";
private final String tenantId;
private final JdbcTemplate jdbc;
@@ -65,26 +65,30 @@ public class ClickHouseAgentEventRepository implements AgentEventRepository {
} catch (java.time.format.DateTimeParseException e) {
throw new IllegalArgumentException("Malformed cursor", e);
}
String cursorInstance = decoded.substring(bar + 1);
sql.append(" AND (timestamp < ? OR (timestamp = ? AND instance_id > ?))");
String cursorInsertId = decoded.substring(bar + 1);
sql.append(" AND (timestamp < ? OR (timestamp = ? AND insert_id < toUUID(?)))");
params.add(Timestamp.from(cursorTs));
params.add(Timestamp.from(cursorTs));
params.add(cursorInstance);
params.add(cursorInsertId);
}
sql.append(" ORDER BY timestamp DESC, instance_id ASC LIMIT ?");
sql.append(" ORDER BY timestamp DESC, insert_id DESC LIMIT ?");
int fetchLimit = limit + 1;
params.add(fetchLimit);
List<String> insertIds = new ArrayList<>();
List<AgentEventRecord> results = new ArrayList<>(jdbc.query(sql.toString(),
(rs, rowNum) -> new AgentEventRecord(
rs.getLong("id"),
rs.getString("instance_id"),
rs.getString("application_id"),
rs.getString("event_type"),
rs.getString("detail"),
rs.getTimestamp("timestamp").toInstant()
), params.toArray()));
(rs, rowNum) -> {
insertIds.add(rs.getString("insert_id_str"));
return new AgentEventRecord(
rs.getLong("id"),
rs.getString("instance_id"),
rs.getString("application_id"),
rs.getString("event_type"),
rs.getString("detail"),
rs.getTimestamp("timestamp").toInstant()
);
}, params.toArray()));
boolean hasMore = results.size() > limit;
if (hasMore) {
@@ -93,8 +97,9 @@ public class ClickHouseAgentEventRepository implements AgentEventRepository {
String nextCursor = null;
if (hasMore && !results.isEmpty()) {
AgentEventRecord last = results.get(results.size() - 1);
String raw = last.timestamp().toString() + "|" + last.instanceId();
int lastIdx = results.size() - 1;
AgentEventRecord last = results.get(lastIdx);
String raw = last.timestamp().toString() + "|" + insertIds.get(lastIdx);
nextCursor = Base64.getUrlEncoder().withoutPadding()
.encodeToString(raw.getBytes(StandardCharsets.UTF_8));
}

13
cameleer-server-app/src/main/resources/clickhouse/init.sql
View File

@@ -327,7 +327,8 @@ CREATE TABLE IF NOT EXISTS agent_events (
instance_id LowCardinality(String),
application_id LowCardinality(String),
event_type LowCardinality(String),
detail String DEFAULT ''
detail String DEFAULT '',
insert_id UUID DEFAULT generateUUIDv4()
)
ENGINE = MergeTree()
PARTITION BY (tenant_id, toYYYYMM(timestamp))
@@ -349,6 +350,7 @@ CREATE TABLE IF NOT EXISTS logs (
stack_trace String DEFAULT '',
exchange_id String DEFAULT '',
mdc Map(String, String) DEFAULT map(),
insert_id UUID DEFAULT generateUUIDv4(),
INDEX idx_msg message TYPE ngrambf_v1(3, 256, 2, 0) GRANULARITY 4,
INDEX idx_stack stack_trace TYPE ngrambf_v1(3, 256, 2, 0) GRANULARITY 4,
@@ -398,3 +400,12 @@ CREATE TABLE IF NOT EXISTS route_catalog (
)
ENGINE = ReplacingMergeTree(last_seen)
ORDER BY (tenant_id, environment, application_id, route_id);
-- insert_id tiebreak for keyset pagination (fixes same-millisecond cursor collision).
-- IF NOT EXISTS on ADD COLUMN is idempotent. MATERIALIZE COLUMN is a background mutation,
-- effectively a no-op once all parts are already materialized.
ALTER TABLE logs ADD COLUMN IF NOT EXISTS insert_id UUID DEFAULT generateUUIDv4();
ALTER TABLE logs MATERIALIZE COLUMN insert_id;
ALTER TABLE agent_events ADD COLUMN IF NOT EXISTS insert_id UUID DEFAULT generateUUIDv4();
ALTER TABLE agent_events MATERIALIZE COLUMN insert_id;