capistrant commented on code in PR #19843:
URL: https://github.com/apache/druid/pull/19843#discussion_r3705941137
##########
server/src/main/java/org/apache/druid/segment/loading/SegmentLocalCacheManager.java:
##########
@@ -1526,6 +1534,47 @@ public void drop(final DataSegment segment)
}
}
+ /**
+ * Releases the partial-load rule applied to {@code dataSegment} in response
to an unwrapped load request: the
+ * coordinator has stopped asking for parts of the segment, so the metadata
entry and the rule's bundles are unpinned.
+ * That is what a full load means under virtual storage — nothing is pinned,
each part is fetched on demand — and
+ * reclaim of the partial state on disk is left to eviction, as it is for
{@link #drop}.
+ * <p>
+ * The rule is cleared before the info file is rewritten because clearing
cannot fail, so the in-memory state and the
+ * load announcement come out right either way. A failed rewrite leaves the
info file describing the released rule,
+ * which a restart reapplies and re-announces until the coordinator's next
load request converts the segment again.
+ * <p>
+ * Callers must hold this segment's {@link #lock(DataSegment)}, which is the
external lock that
+ * {@link PartialSegmentMetadataCacheEntry#clearRule} requires to be
serialized against
+ * {@link PartialSegmentMetadataCacheEntry#applyRule}.
+ */
+ private void releaseRuleForFullLoad(DataSegment dataSegment,
PartialSegmentMetadataCacheEntry partial)
+ {
+ // Snapshot both before clearRule zeroes out the rule state so the log can
describe what was released.
+ final String priorFingerprint = partial.getRuleFingerprint();
+ final long priorRealizedBytes = partial.getRealizedBytes();
+ partial.clearRule();
+ log.info(
+ "Released partial-load rule[fingerprint=%s, realizedBytes=%d] for
segment[%s]; it is a regular full load now.",
+ priorFingerprint,
+ priorRealizedBytes,
+ dataSegment.getId()
+ );
+ try {
+ rewriteInfoFile(dataSegment);
+ }
+ catch (IOException e) {
+ log.warn(
Review Comment:
as of now I've accepted the consequence that on restart the info file is not
desirable as it will partial load to the prior state. the coordinator should
quickly try to reconcile though
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