kfaraz commented on code in PR #19737:
URL: https://github.com/apache/druid/pull/19737#discussion_r3646645334
##########
indexing-service/src/main/java/org/apache/druid/indexing/common/task/KillUnusedSegmentsTask.java:
##########
@@ -251,62 +258,46 @@ public TaskStatus runTask(TaskToolbox toolbox) throws
Exception
);
}
- // Kill segments. Order is important here:
- // Retrieve the segment upgrade infos for the batch _before_ the
segments are nuked
- // We then want the nuke action to clean up the metadata records
_before_ the segments are removed from storage.
- // This helps maintain that we will always have a storage segment if the
metadata segment is present.
- // Determine the subset of segments to be killed from deep storage based
on loadspecs.
- // If the segment nuke throws an exception, then the segment cleanup is
abandoned.
-
- // Determine upgraded segment ids before nuking
- final Set<String> segmentIds = unusedSegments.stream()
- .map(DataSegment::getId)
- .map(SegmentId::toString)
-
.collect(Collectors.toSet());
- final Map<String, String> upgradedFromSegmentIds = new HashMap<>();
- try {
- upgradedFromSegmentIds.putAll(
- taskActionClient.submit(
- new RetrieveUpgradedFromSegmentIdsAction(getDataSource(),
segmentIds)
- ).getUpgradedFromSegmentIds()
- );
- }
- catch (Exception e) {
- LOG.warn(
- e,
- "Could not retrieve parent segment ids using task
action[retrieveUpgradedFromSegmentIds]."
- + " Overlord may be on an older version."
- );
- }
+ // Kill segments - order of steps 1, 2, 3, 4 must remain the same
- // Nuke Segments
- taskActionClient.submit(new SegmentNukeAction(new
HashSet<>(unusedSegments)));
- emitMetric(toolbox.getEmitter(),
TaskMetrics.SEGMENTS_DELETED_FROM_METADATA_STORE, unusedSegments.size());
+ // 1. Determine parent segment ids of killable unused segments
+ final Map<String, String> upgradedFromSegmentIds
+ = fetchParentIdsForSegments(toolbox, unusedSegmentsPlus);
- // Determine segments to be killed
- final List<DataSegment> segmentsToBeKilled
- = getKillableSegments(unusedSegments, upgradedFromSegmentIds,
usedSegmentLoadSpecs, taskActionClient);
+ // 2. Identify killable segments whose load specs are not shared with
any other segment
+ final List<DataSegment> segmentsToKillFromDeepStore =
getKillableSegments(
+ unusedSegments,
+ upgradedFromSegmentIds,
+ usedSegmentLoadSpecs,
+ taskActionClient
+ );
+ // 2a. Track segments that cannot be removed from deep store yet
final Set<DataSegment> segmentsNotKilled = new HashSet<>(unusedSegments);
- segmentsToBeKilled.forEach(segmentsNotKilled::remove);
-
+ segmentsToKillFromDeepStore.forEach(segmentsNotKilled::remove);
if (!segmentsNotKilled.isEmpty()) {
LOG.warn(
- "Skipping kill of [%d] segments from deep storage as their load
specs are used by other segments.",
- segmentsNotKilled.size()
+ "Skipping kill of [%d] segments of datasource[%s] from deep
storage"
+ + " as their load specs are shared by other segments.",
+ segmentsNotKilled.size(), getDataSource()
);
}
- toolbox.getDataSegmentKiller().kill(segmentsToBeKilled);
- emitMetric(toolbox.getEmitter(),
TaskMetrics.SEGMENTS_DELETED_FROM_DEEPSTORE, segmentsToBeKilled.size());
+ // 3. Nuke all eligible unused segments
Review Comment:
Adding a comment in javadoc.
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