xiangfu0 commented on code in PR #19861:
URL: https://github.com/apache/pinot/pull/19861#discussion_r4289854229
##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/data/manager/TableDataManager.java:
##########
@@ -169,15 +169,41 @@ void deleteSegment(String segmentName)
/// `forceDownload` flag is true.
/// This operation is conducted within a failure handling framework and made
transparent to ongoing queries, because
/// the segment is in online serving state.
- void reloadSegment(String segmentName, boolean forceDownload, String
reloadJobId)
+ default void reloadSegment(String segmentName, boolean forceDownload, String
reloadJobId)
+ throws Exception {
+ reloadSegment(segmentName, forceDownload, false, reloadJobId);
+ }
+
+ /// Same as [#reloadSegment(String, boolean, String)], but when
`onlyIfNeeded` is true (and `forceDownload` is false)
+ /// the segment is skipped if its loaded copy is already up to date: same
CRC as ZK, already on the target tier, and
+ /// no preprocessing needed under the current table config and schema.
Consuming segments are always skipped in this
+ /// mode. Skipped segments are recorded in the reload job status and
reported as successful.
+ ///
+ /// This does not cover settings that only take effect when a segment is
loaded (e.g. read mode or tier storage
+ /// properties) or rebuilding derived state such as upsert metadata; a full
reload is still needed for those.
+ void reloadSegment(String segmentName, boolean forceDownload, boolean
onlyIfNeeded, String reloadJobId)
Review Comment:
This breaks external implementers of this SPI. Turning the old 3-arg methods
into `default` while adding these new *abstract* overloads means any
out-of-tree `TableDataManager` (plugged in via
`table.data.manager.provider.class`) that only implemented the 3-arg versions
will no longer compile, and an already-built one throws `AbstractMethodError`
since the server now always calls the 4-arg form.
Since `japicmp.skip=true`, CI won't catch this. Consider giving the new
overloads a `default` body that falls back to the old behavior (ignoring
`onlyIfNeeded`) and overriding them in `BaseTableDataManager` — that keeps
existing implementers working. Same applies to `InstanceDataManager`.
##########
pinot-server/src/main/java/org/apache/pinot/server/api/resources/ControllerJobStatusResource.java:
##########
@@ -85,9 +85,15 @@ public String
reloadJobStatus(@PathParam("tableNameWithType") String tableNameWi
totalSegmentCount = targetSegments.size();
}
try {
+ ReloadJobStatus jobStatus = reloadJobId != null ?
_serverReloadJobStatusCache.getJobStatus(reloadJobId) : null;
+ // Segments skipped by an only-if-needed reload keep their old load time
but are up to date, so they count as
+ // successful. Checking by name counts each segment once, even if it was
reloaded again after being skipped, and
+ // leaves out skipped segments that have since been dropped.
+ boolean hasSkippedSegments = jobStatus != null &&
jobStatus.hasSkippedSegments();
int successCount = 0;
for (SegmentDataManager segmentDataManager : segmentDataManagers) {
- if (segmentDataManager.getLoadTimeMs() >=
reloadJobSubmissionTimestamp) {
+ if (segmentDataManager.getLoadTimeMs() >= reloadJobSubmissionTimestamp
+ || (hasSkippedSegments &&
jobStatus.isSkipped(segmentDataManager.getSegmentName()))) {
Review Comment:
For a skipped segment, success is signalled only through this `isSkipped`
lookup, since its `loadTimeMs` stays older than the job timestamp. That signal
lives solely in the Guava cache (expireAfterWrite + maxSize), unlike a normal
reload whose `loadTimeMs` is durable.
So once the entry is evicted (default 30d TTL, or >maxSize jobs, or a config
rebuild), a re-query counts those segments as pending again and the job reports
IN_PROGRESS forever. A normal reload never flips back like this. Could we make
the skip durable (e.g. bump loadTimeMs, or treat a missing-but-dispatched job
as complete) or at least document the caveat?
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