dampcake commented on a change in pull request #7490: Add reload by interval API
URL: https://github.com/apache/incubator-druid/pull/7490#discussion_r278201183
##########
File path:
server/src/main/java/org/apache/druid/metadata/SQLMetadataSegmentManager.java
##########
@@ -219,83 +218,144 @@ public void stop()
}
}
- @Override
- public boolean enableDataSource(final String dataSource)
+ private VersionedIntervalTimeline<String, DataSegment>
getVersionedIntervalTimeline(final String dataSource, final Interval interval)
{
- try {
- final IDBI dbi = connector.getDBI();
- VersionedIntervalTimeline<String, DataSegment> segmentTimeline =
connector.inReadOnlyTransaction(
- (handle, status) -> VersionedIntervalTimeline.forSegments(
- Iterators.transform(
- handle
- .createQuery(
- StringUtils.format(
- "SELECT payload FROM %s WHERE dataSource =
:dataSource",
- getSegmentsTable()
- )
- )
- .setFetchSize(connector.getStreamingFetchSize())
- .bind("dataSource", dataSource)
- .map(ByteArrayMapper.FIRST)
- .iterator(),
- payload -> {
- try {
- return jsonMapper.readValue(payload, DataSegment.class);
- }
- catch (IOException e) {
- throw new RuntimeException(e);
- }
+ return connector.inReadOnlyTransaction(
+ (handle, status) -> VersionedIntervalTimeline.forSegments(
+ Iterators.transform(
+ handle
+ .createQuery(
+ StringUtils.format(
+ "SELECT payload FROM %1$s WHERE dataSource =
:dataSource AND start >= :start AND %2$send%2$s <= :end",
+ getSegmentsTable(), connector.getQuoteString()
+ )
+ )
+ .setFetchSize(connector.getStreamingFetchSize())
+ .bind("dataSource", dataSource)
+ .bind("start", interval.getStart().toString())
+ .bind("end", interval.getEnd().toString())
+ .map(ByteArrayMapper.FIRST)
+ .iterator(),
+ payload -> {
+ try {
+ return jsonMapper.readValue(payload, DataSegment.class);
}
- )
-
- )
- );
-
- final List<DataSegment> segments = new ArrayList<>();
- List<TimelineObjectHolder<String, DataSegment>> timelineObjectHolders =
segmentTimeline.lookup(
- Intervals.of("0000-01-01/3000-01-01")
- );
- for (TimelineObjectHolder<String, DataSegment> objectHolder :
timelineObjectHolders) {
- for (PartitionChunk<DataSegment> partitionChunk :
objectHolder.getObject()) {
- segments.add(partitionChunk.getObject());
- }
- }
-
- if (segments.isEmpty()) {
- log.warn("No segments found in the database!");
- return false;
- }
-
- dbi.withHandle(
- new HandleCallback<Void>()
- {
- @Override
- public Void withHandle(Handle handle)
- {
- Batch batch = handle.createBatch();
+ catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+ }
+ )
+ )
+ );
+ }
- for (DataSegment segment : segments) {
- batch.add(
+ private VersionedIntervalTimeline<String, DataSegment>
getVersionedIntervalTimeline(final String dataSource, final Collection<String>
segmentIds)
+ {
+ return connector.inReadOnlyTransaction(
+ (handle, status) ->
VersionedIntervalTimeline.forSegments(segmentIds.stream().map(segmentId -> {
+ try {
+ return jsonMapper.readValue(StreamSupport.stream(
+ handle.createQuery(
StringUtils.format(
- "UPDATE %s SET used=true WHERE id = '%s'",
- getSegmentsTable(),
- segment.getId()
+ "SELECT payload FROM %1$s WHERE dataSource =
:dataSource AND id = :id",
+ getSegmentsTable()
)
- );
- }
- batch.execute();
-
- return null;
- }
+ )
+ .setFetchSize(connector.getStreamingFetchSize())
+ .bind("dataSource", dataSource)
+ .bind("id", segmentId)
+ .map(ByteArrayMapper.FIRST)
+ .spliterator(), false
+ ).findFirst().orElseThrow(
+ () -> new UnknownSegmentIdException(StringUtils.format("Cannot
find segment id [%s]", segmentId))
+ ), DataSegment.class);
}
- );
+ catch (IOException e) {
+ throw new RuntimeException(e);
+ }
+ }).collect(Collectors.toList()))
+ );
+ }
+
+ private Stream<SegmentId> segmentIdsForInterval(
+ final VersionedIntervalTimeline<String, DataSegment>
versionedIntervalTimeline,
+ final Interval interval
+ )
+ {
+ return versionedIntervalTimeline.lookup(interval).stream().flatMap(
+ objectHolder ->
StreamSupport.stream(objectHolder.getObject().spliterator(), false).map(
+ dataSegmentPartitionChunk ->
dataSegmentPartitionChunk.getObject().getId()
+ )
+ );
+ }
+
+ @Override
+ public boolean enableDataSource(final String dataSource)
+ {
+ try {
+ return enableSegments(dataSource, Intervals.ETERNITY) != 0;
}
catch (Exception e) {
log.error(e, "Exception enabling datasource %s", dataSource);
return false;
}
+ }
- return true;
+ @Override
+ public int enableSegments(final String dataSource, final Interval interval)
Review comment:
> For the segmentId case:
>
> 1. Create an empty timeline
> 2. Add the provided segments to the timeline
This requires a query to convert the segmentId Strings to actual segments.
Should this query be in the same transaction as step 4?
> 3. Using JodaUtils.condenseIntervals(), build a condensed list of
intervals from the intervals of the provided segment set
> 4. In a single transaction, issue a used=true + interval overlaps query
for each interval in the condensed intervals list constructed in 3 (could be a
single query with an OR clause for each condensed interval), and add these
used+overlapping segments to the timeline
> 5. For each provided segment, enable it if isOvershadowed is false
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