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Posted to commits@druid.apache.org by GitBox <gi...@apache.org> on 2020/06/16 06:05:03 UTC
[GitHub] [druid] gianm commented on a change in pull request #10020: global table datasource for broadcast segments
gianm commented on a change in pull request #10020:
URL: https://github.com/apache/druid/pull/10020#discussion_r440600939
##########
File path: processing/src/main/java/org/apache/druid/query/GlobalTableDataSource.java
##########
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.druid.query;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+
+/**
+ * {@link TableDataSource} variant for globally available 'broadcast' segments. If bound to a
+ * {@link org.apache.druid.segment.join.JoinableFactory} that can create an
+ * {@link org.apache.druid.segment.join.table.IndexedTable} using DruidBinders.joinableFactoryBinder, this allows
+ * optimal usage of segments using this DataSource type in join operations (because they are global), and so can be pushed
+ * down to historicals as a {@link JoinDataSource}, instead of requiring a subquery join using
+ * {@link InlineDataSource} to construct an {@link org.apache.druid.segment.join.table.IndexedTable} on the fly on the
+ * broker. Because it is also a {@link TableDataSource}, when queried directly, or on the left hand side of a join,
+ * they will be treated as any normal segment.
+ */
+@JsonTypeName("global")
+public class GlobalTableDataSource extends TableDataSource
+{
+ @JsonCreator
+ public GlobalTableDataSource(@JsonProperty("name") String name)
+ {
+ super(name);
+ }
+
+ @Override
+ public boolean isCacheable()
+ {
+ return false;
Review comment:
Why shouldn't it be cacheable?
##########
File path: processing/src/main/java/org/apache/druid/query/TableDataSource.java
##########
@@ -102,6 +102,11 @@ public final boolean equals(Object o)
return false;
}
+ if ((o instanceof GlobalTableDataSource || this instanceof GlobalTableDataSource) &&
+ !getClass().equals(o.getClass())) {
Review comment:
I think you can make this a little less gross by replacing this `equals` impl (and the one in GlobalTableDataSource) with a new auto-generated one that checks getClass.
##########
File path: processing/src/main/java/org/apache/druid/query/GlobalTableDataSource.java
##########
@@ -0,0 +1,64 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.druid.query;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+
+/**
+ * {@link TableDataSource} variant for globally available 'broadcast' segments. If bound to a
+ * {@link org.apache.druid.segment.join.JoinableFactory} that can create an
+ * {@link org.apache.druid.segment.join.table.IndexedTable} using DruidBinders.joinableFactoryBinder, this allows
+ * optimal usage of segments using this DataSource type in join operations (because they are global), and so can be pushed
+ * down to historicals as a {@link JoinDataSource}, instead of requiring a subquery join using
+ * {@link InlineDataSource} to construct an {@link org.apache.druid.segment.join.table.IndexedTable} on the fly on the
+ * broker. Because it is also a {@link TableDataSource}, when queried directly, or on the left hand side of a join,
+ * they will be treated as any normal segment.
Review comment:
"datasource" makes more sense here than "segment".
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/schema/DruidSchema.java
##########
@@ -196,119 +207,132 @@ public DruidSchema(
public void start() throws InterruptedException
{
cacheExec.submit(
- new Runnable()
- {
- @Override
- public void run()
- {
- try {
- while (!Thread.currentThread().isInterrupted()) {
- final Set<SegmentId> segmentsToRefresh = new TreeSet<>();
- final Set<String> dataSourcesToRebuild = new TreeSet<>();
-
- try {
- synchronized (lock) {
- final long nextRefreshNoFuzz = DateTimes
- .utc(lastRefresh)
- .plus(config.getMetadataRefreshPeriod())
- .getMillis();
-
- // Fuzz a bit to spread load out when we have multiple brokers.
- final long nextRefresh = nextRefreshNoFuzz + (long) ((nextRefreshNoFuzz - lastRefresh) * 0.10);
-
- while (true) {
- // Do not refresh if it's too soon after a failure (to avoid rapid cycles of failure).
- final boolean wasRecentFailure = DateTimes.utc(lastFailure)
- .plus(config.getMetadataRefreshPeriod())
- .isAfterNow();
-
- if (isServerViewInitialized &&
- !wasRecentFailure &&
- (!segmentsNeedingRefresh.isEmpty() || !dataSourcesNeedingRebuild.isEmpty()) &&
- (refreshImmediately || nextRefresh < System.currentTimeMillis())) {
- // We need to do a refresh. Break out of the waiting loop.
- break;
- }
-
- if (isServerViewInitialized) {
- // Server view is initialized, but we don't need to do a refresh. Could happen if there are
- // no segments in the system yet. Just mark us as initialized, then.
- initialized.countDown();
- }
-
- // Wait some more, we'll wake up when it might be time to do another refresh.
- lock.wait(Math.max(1, nextRefresh - System.currentTimeMillis()));
+ () -> {
+ try {
+ while (!Thread.currentThread().isInterrupted()) {
+ final Set<SegmentId> segmentsToRefresh = new TreeSet<>();
+ final Set<String> dataSourcesToRebuild = new TreeSet<>();
+
+ try {
+ synchronized (lock) {
+ final long nextRefreshNoFuzz = DateTimes
+ .utc(lastRefresh)
+ .plus(config.getMetadataRefreshPeriod())
+ .getMillis();
+
+ // Fuzz a bit to spread load out when we have multiple brokers.
+ final long nextRefresh = nextRefreshNoFuzz + (long) ((nextRefreshNoFuzz - lastRefresh) * 0.10);
+
+ while (true) {
+ // Do not refresh if it's too soon after a failure (to avoid rapid cycles of failure).
+ final boolean wasRecentFailure = DateTimes.utc(lastFailure)
+ .plus(config.getMetadataRefreshPeriod())
+ .isAfterNow();
+
+ if (isServerViewInitialized &&
+ !wasRecentFailure &&
+ (!segmentsNeedingRefresh.isEmpty() || !dataSourcesNeedingRebuild.isEmpty()) &&
+ (refreshImmediately || nextRefresh < System.currentTimeMillis())) {
+ // We need to do a refresh. Break out of the waiting loop.
+ break;
}
- segmentsToRefresh.addAll(segmentsNeedingRefresh);
- segmentsNeedingRefresh.clear();
-
- // Mutable segments need a refresh every period, since new columns could be added dynamically.
- segmentsNeedingRefresh.addAll(mutableSegments);
+ if (isServerViewInitialized) {
+ // Server view is initialized, but we don't need to do a refresh. Could happen if there are
+ // no segments in the system yet. Just mark us as initialized, then.
+ initialized.countDown();
+ }
- lastFailure = 0L;
- lastRefresh = System.currentTimeMillis();
- refreshImmediately = false;
+ // Wait some more, we'll wake up when it might be time to do another refresh.
+ lock.wait(Math.max(1, nextRefresh - System.currentTimeMillis()));
}
- // Refresh the segments.
- final Set<SegmentId> refreshed = refreshSegments(segmentsToRefresh);
+ segmentsToRefresh.addAll(segmentsNeedingRefresh);
+ segmentsNeedingRefresh.clear();
- synchronized (lock) {
- // Add missing segments back to the refresh list.
- segmentsNeedingRefresh.addAll(Sets.difference(segmentsToRefresh, refreshed));
+ // Mutable segments need a refresh every period, since new columns could be added dynamically.
+ segmentsNeedingRefresh.addAll(mutableSegments);
- // Compute the list of dataSources to rebuild tables for.
- dataSourcesToRebuild.addAll(dataSourcesNeedingRebuild);
- refreshed.forEach(segment -> dataSourcesToRebuild.add(segment.getDataSource()));
- dataSourcesNeedingRebuild.clear();
+ lastFailure = 0L;
+ lastRefresh = System.currentTimeMillis();
+ refreshImmediately = false;
+ }
- lock.notifyAll();
- }
+ // Refresh the segments.
+ final Set<SegmentId> refreshed = refreshSegments(segmentsToRefresh);
- // Rebuild the dataSources.
- for (String dataSource : dataSourcesToRebuild) {
- final DruidTable druidTable = buildDruidTable(dataSource);
- final DruidTable oldTable = tables.put(dataSource, druidTable);
- if (oldTable == null || !oldTable.getRowSignature().equals(druidTable.getRowSignature())) {
- log.info("dataSource [%s] has new signature: %s.", dataSource, druidTable.getRowSignature());
- } else {
- log.debug("dataSource [%s] signature is unchanged.", dataSource);
- }
- }
+ synchronized (lock) {
+ // Add missing segments back to the refresh list.
+ segmentsNeedingRefresh.addAll(Sets.difference(segmentsToRefresh, refreshed));
- initialized.countDown();
- }
- catch (InterruptedException e) {
- // Fall through.
- throw e;
+ // Compute the list of dataSources to rebuild tables for.
+ dataSourcesToRebuild.addAll(dataSourcesNeedingRebuild);
+ refreshed.forEach(segment -> dataSourcesToRebuild.add(segment.getDataSource()));
+ dataSourcesNeedingRebuild.clear();
+
+ lock.notifyAll();
}
- catch (Exception e) {
- log.warn(e, "Metadata refresh failed, trying again soon.");
-
- synchronized (lock) {
- // Add our segments and dataSources back to their refresh and rebuild lists.
- segmentsNeedingRefresh.addAll(segmentsToRefresh);
- dataSourcesNeedingRebuild.addAll(dataSourcesToRebuild);
- lastFailure = System.currentTimeMillis();
- lock.notifyAll();
+
+ // Rebuild the dataSources.
+ for (String dataSource : dataSourcesToRebuild) {
+ final DruidTable druidTable = buildDruidTable(dataSource);
+ final DruidTable oldTable = tables.put(dataSource, druidTable);
+ if (oldTable == null || !oldTable.getRowSignature().equals(druidTable.getRowSignature())) {
+ log.info("dataSource [%s] has new signature: %s.", dataSource, druidTable.getRowSignature());
+ } else {
+ log.debug("dataSource [%s] signature is unchanged.", dataSource);
}
}
+
+ initialized.countDown();
+ }
+ catch (InterruptedException e) {
+ // Fall through.
+ throw e;
+ }
+ catch (Exception e) {
+ log.warn(e, "Metadata refresh failed, trying again soon.");
+
+ synchronized (lock) {
+ // Add our segments and dataSources back to their refresh and rebuild lists.
+ segmentsNeedingRefresh.addAll(segmentsToRefresh);
+ dataSourcesNeedingRebuild.addAll(dataSourcesToRebuild);
+ lastFailure = System.currentTimeMillis();
+ lock.notifyAll();
+ }
}
- }
- catch (InterruptedException e) {
- // Just exit.
- }
- catch (Throwable e) {
- // Throwables that fall out to here (not caught by an inner try/catch) are potentially gnarly, like
- // OOMEs. Anyway, let's just emit an alert and stop refreshing metadata.
- log.makeAlert(e, "Metadata refresh failed permanently").emit();
- throw e;
- }
- finally {
- log.info("Metadata refresh stopped.");
}
}
+ catch (InterruptedException e) {
+ // Just exit.
+ }
+ catch (Throwable e) {
+ // Throwables that fall out to here (not caught by an inner try/catch) are potentially gnarly, like
+ // OOMEs. Anyway, let's just emit an alert and stop refreshing metadata.
+ log.makeAlert(e, "Metadata refresh failed permanently").emit();
+ throw e;
+ }
+ finally {
+ log.info("Metadata refresh stopped.");
+ }
+ }
+ );
+
+ ScheduledExecutors.scheduleWithFixedDelay(
+ localSegmentExec,
+ config.getMetadataRefreshPeriod().toStandardDuration(),
+ config.getMetadataRefreshPeriod().toStandardDuration(),
+ () -> {
+ synchronized (lock) {
+ // refresh known broadcast segments. Since DruidSchema is only present on the broker, any segment we have
+ // locally in the SegmentManager must be broadcast datasources. This could potentially be replaced in the
+ // future by fetching load rules from the coordinator
+ Set<String> localSegmentDatasources = segmentManager.getDataSourceNames();
Review comment:
`localSegmentDataSources` would be more consistent spelling, I think.
##########
File path: processing/src/test/java/org/apache/druid/query/GlobalTableDataSourceTest.java
##########
@@ -0,0 +1,65 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.druid.query;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import nl.jqno.equalsverifier.EqualsVerifier;
+import org.apache.druid.segment.TestHelper;
+import org.junit.Assert;
+import org.junit.Test;
+
+public class GlobalTableDataSourceTest
+{
+ private static final GlobalTableDataSource GLOBAL_TABLE_DATA_SOURCE = new GlobalTableDataSource("foo");
+
+ @Test
+ public void testEquals()
Review comment:
Please add a test for nonequality with a TableDataSource of the same name.
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/schema/DruidSchema.java
##########
@@ -196,119 +207,132 @@ public DruidSchema(
public void start() throws InterruptedException
{
cacheExec.submit(
- new Runnable()
- {
- @Override
- public void run()
- {
- try {
- while (!Thread.currentThread().isInterrupted()) {
- final Set<SegmentId> segmentsToRefresh = new TreeSet<>();
- final Set<String> dataSourcesToRebuild = new TreeSet<>();
-
- try {
- synchronized (lock) {
- final long nextRefreshNoFuzz = DateTimes
- .utc(lastRefresh)
- .plus(config.getMetadataRefreshPeriod())
- .getMillis();
-
- // Fuzz a bit to spread load out when we have multiple brokers.
- final long nextRefresh = nextRefreshNoFuzz + (long) ((nextRefreshNoFuzz - lastRefresh) * 0.10);
-
- while (true) {
- // Do not refresh if it's too soon after a failure (to avoid rapid cycles of failure).
- final boolean wasRecentFailure = DateTimes.utc(lastFailure)
- .plus(config.getMetadataRefreshPeriod())
- .isAfterNow();
-
- if (isServerViewInitialized &&
- !wasRecentFailure &&
- (!segmentsNeedingRefresh.isEmpty() || !dataSourcesNeedingRebuild.isEmpty()) &&
- (refreshImmediately || nextRefresh < System.currentTimeMillis())) {
- // We need to do a refresh. Break out of the waiting loop.
- break;
- }
-
- if (isServerViewInitialized) {
- // Server view is initialized, but we don't need to do a refresh. Could happen if there are
- // no segments in the system yet. Just mark us as initialized, then.
- initialized.countDown();
- }
-
- // Wait some more, we'll wake up when it might be time to do another refresh.
- lock.wait(Math.max(1, nextRefresh - System.currentTimeMillis()));
+ () -> {
+ try {
+ while (!Thread.currentThread().isInterrupted()) {
+ final Set<SegmentId> segmentsToRefresh = new TreeSet<>();
+ final Set<String> dataSourcesToRebuild = new TreeSet<>();
+
+ try {
+ synchronized (lock) {
+ final long nextRefreshNoFuzz = DateTimes
+ .utc(lastRefresh)
+ .plus(config.getMetadataRefreshPeriod())
+ .getMillis();
+
+ // Fuzz a bit to spread load out when we have multiple brokers.
+ final long nextRefresh = nextRefreshNoFuzz + (long) ((nextRefreshNoFuzz - lastRefresh) * 0.10);
+
+ while (true) {
+ // Do not refresh if it's too soon after a failure (to avoid rapid cycles of failure).
+ final boolean wasRecentFailure = DateTimes.utc(lastFailure)
+ .plus(config.getMetadataRefreshPeriod())
+ .isAfterNow();
+
+ if (isServerViewInitialized &&
+ !wasRecentFailure &&
+ (!segmentsNeedingRefresh.isEmpty() || !dataSourcesNeedingRebuild.isEmpty()) &&
+ (refreshImmediately || nextRefresh < System.currentTimeMillis())) {
+ // We need to do a refresh. Break out of the waiting loop.
+ break;
}
- segmentsToRefresh.addAll(segmentsNeedingRefresh);
- segmentsNeedingRefresh.clear();
-
- // Mutable segments need a refresh every period, since new columns could be added dynamically.
- segmentsNeedingRefresh.addAll(mutableSegments);
+ if (isServerViewInitialized) {
+ // Server view is initialized, but we don't need to do a refresh. Could happen if there are
+ // no segments in the system yet. Just mark us as initialized, then.
+ initialized.countDown();
+ }
- lastFailure = 0L;
- lastRefresh = System.currentTimeMillis();
- refreshImmediately = false;
+ // Wait some more, we'll wake up when it might be time to do another refresh.
+ lock.wait(Math.max(1, nextRefresh - System.currentTimeMillis()));
}
- // Refresh the segments.
- final Set<SegmentId> refreshed = refreshSegments(segmentsToRefresh);
+ segmentsToRefresh.addAll(segmentsNeedingRefresh);
+ segmentsNeedingRefresh.clear();
- synchronized (lock) {
- // Add missing segments back to the refresh list.
- segmentsNeedingRefresh.addAll(Sets.difference(segmentsToRefresh, refreshed));
+ // Mutable segments need a refresh every period, since new columns could be added dynamically.
+ segmentsNeedingRefresh.addAll(mutableSegments);
- // Compute the list of dataSources to rebuild tables for.
- dataSourcesToRebuild.addAll(dataSourcesNeedingRebuild);
- refreshed.forEach(segment -> dataSourcesToRebuild.add(segment.getDataSource()));
- dataSourcesNeedingRebuild.clear();
+ lastFailure = 0L;
+ lastRefresh = System.currentTimeMillis();
+ refreshImmediately = false;
+ }
- lock.notifyAll();
- }
+ // Refresh the segments.
+ final Set<SegmentId> refreshed = refreshSegments(segmentsToRefresh);
- // Rebuild the dataSources.
- for (String dataSource : dataSourcesToRebuild) {
- final DruidTable druidTable = buildDruidTable(dataSource);
- final DruidTable oldTable = tables.put(dataSource, druidTable);
- if (oldTable == null || !oldTable.getRowSignature().equals(druidTable.getRowSignature())) {
- log.info("dataSource [%s] has new signature: %s.", dataSource, druidTable.getRowSignature());
- } else {
- log.debug("dataSource [%s] signature is unchanged.", dataSource);
- }
- }
+ synchronized (lock) {
+ // Add missing segments back to the refresh list.
+ segmentsNeedingRefresh.addAll(Sets.difference(segmentsToRefresh, refreshed));
- initialized.countDown();
- }
- catch (InterruptedException e) {
- // Fall through.
- throw e;
+ // Compute the list of dataSources to rebuild tables for.
+ dataSourcesToRebuild.addAll(dataSourcesNeedingRebuild);
+ refreshed.forEach(segment -> dataSourcesToRebuild.add(segment.getDataSource()));
+ dataSourcesNeedingRebuild.clear();
+
+ lock.notifyAll();
}
- catch (Exception e) {
- log.warn(e, "Metadata refresh failed, trying again soon.");
-
- synchronized (lock) {
- // Add our segments and dataSources back to their refresh and rebuild lists.
- segmentsNeedingRefresh.addAll(segmentsToRefresh);
- dataSourcesNeedingRebuild.addAll(dataSourcesToRebuild);
- lastFailure = System.currentTimeMillis();
- lock.notifyAll();
+
+ // Rebuild the dataSources.
+ for (String dataSource : dataSourcesToRebuild) {
+ final DruidTable druidTable = buildDruidTable(dataSource);
+ final DruidTable oldTable = tables.put(dataSource, druidTable);
+ if (oldTable == null || !oldTable.getRowSignature().equals(druidTable.getRowSignature())) {
+ log.info("dataSource [%s] has new signature: %s.", dataSource, druidTable.getRowSignature());
+ } else {
+ log.debug("dataSource [%s] signature is unchanged.", dataSource);
}
}
+
+ initialized.countDown();
+ }
+ catch (InterruptedException e) {
+ // Fall through.
+ throw e;
+ }
+ catch (Exception e) {
+ log.warn(e, "Metadata refresh failed, trying again soon.");
+
+ synchronized (lock) {
+ // Add our segments and dataSources back to their refresh and rebuild lists.
+ segmentsNeedingRefresh.addAll(segmentsToRefresh);
+ dataSourcesNeedingRebuild.addAll(dataSourcesToRebuild);
+ lastFailure = System.currentTimeMillis();
+ lock.notifyAll();
+ }
}
- }
- catch (InterruptedException e) {
- // Just exit.
- }
- catch (Throwable e) {
- // Throwables that fall out to here (not caught by an inner try/catch) are potentially gnarly, like
- // OOMEs. Anyway, let's just emit an alert and stop refreshing metadata.
- log.makeAlert(e, "Metadata refresh failed permanently").emit();
- throw e;
- }
- finally {
- log.info("Metadata refresh stopped.");
}
}
+ catch (InterruptedException e) {
+ // Just exit.
+ }
+ catch (Throwable e) {
+ // Throwables that fall out to here (not caught by an inner try/catch) are potentially gnarly, like
+ // OOMEs. Anyway, let's just emit an alert and stop refreshing metadata.
+ log.makeAlert(e, "Metadata refresh failed permanently").emit();
+ throw e;
+ }
+ finally {
+ log.info("Metadata refresh stopped.");
+ }
+ }
+ );
+
+ ScheduledExecutors.scheduleWithFixedDelay(
+ localSegmentExec,
+ config.getMetadataRefreshPeriod().toStandardDuration(),
+ config.getMetadataRefreshPeriod().toStandardDuration(),
+ () -> {
+ synchronized (lock) {
+ // refresh known broadcast segments. Since DruidSchema is only present on the broker, any segment we have
+ // locally in the SegmentManager must be broadcast datasources. This could potentially be replaced in the
+ // future by fetching load rules from the coordinator
+ Set<String> localSegmentDatasources = segmentManager.getDataSourceNames();
+ dataSourcesNeedingRebuild.addAll(localSegmentDatasources);
Review comment:
Why do we need to rebuild them all continuously?
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/schema/DruidSchema.java
##########
@@ -122,6 +128,8 @@
// All dataSources that need tables regenerated.
private final Set<String> dataSourcesNeedingRebuild = new HashSet<>();
+ private final Set<String> broadcastDatasources = new HashSet<>();
Review comment:
`broadcastDataSources` is more consistent spelling. Please add a comment too.
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/schema/DruidSchema.java
##########
@@ -196,119 +207,132 @@ public DruidSchema(
public void start() throws InterruptedException
{
cacheExec.submit(
- new Runnable()
- {
- @Override
- public void run()
- {
- try {
- while (!Thread.currentThread().isInterrupted()) {
- final Set<SegmentId> segmentsToRefresh = new TreeSet<>();
- final Set<String> dataSourcesToRebuild = new TreeSet<>();
-
- try {
- synchronized (lock) {
- final long nextRefreshNoFuzz = DateTimes
- .utc(lastRefresh)
- .plus(config.getMetadataRefreshPeriod())
- .getMillis();
-
- // Fuzz a bit to spread load out when we have multiple brokers.
- final long nextRefresh = nextRefreshNoFuzz + (long) ((nextRefreshNoFuzz - lastRefresh) * 0.10);
-
- while (true) {
- // Do not refresh if it's too soon after a failure (to avoid rapid cycles of failure).
- final boolean wasRecentFailure = DateTimes.utc(lastFailure)
- .plus(config.getMetadataRefreshPeriod())
- .isAfterNow();
-
- if (isServerViewInitialized &&
- !wasRecentFailure &&
- (!segmentsNeedingRefresh.isEmpty() || !dataSourcesNeedingRebuild.isEmpty()) &&
- (refreshImmediately || nextRefresh < System.currentTimeMillis())) {
- // We need to do a refresh. Break out of the waiting loop.
- break;
- }
-
- if (isServerViewInitialized) {
- // Server view is initialized, but we don't need to do a refresh. Could happen if there are
- // no segments in the system yet. Just mark us as initialized, then.
- initialized.countDown();
- }
-
- // Wait some more, we'll wake up when it might be time to do another refresh.
- lock.wait(Math.max(1, nextRefresh - System.currentTimeMillis()));
+ () -> {
+ try {
+ while (!Thread.currentThread().isInterrupted()) {
+ final Set<SegmentId> segmentsToRefresh = new TreeSet<>();
+ final Set<String> dataSourcesToRebuild = new TreeSet<>();
+
+ try {
+ synchronized (lock) {
+ final long nextRefreshNoFuzz = DateTimes
+ .utc(lastRefresh)
+ .plus(config.getMetadataRefreshPeriod())
+ .getMillis();
+
+ // Fuzz a bit to spread load out when we have multiple brokers.
+ final long nextRefresh = nextRefreshNoFuzz + (long) ((nextRefreshNoFuzz - lastRefresh) * 0.10);
+
+ while (true) {
+ // Do not refresh if it's too soon after a failure (to avoid rapid cycles of failure).
+ final boolean wasRecentFailure = DateTimes.utc(lastFailure)
+ .plus(config.getMetadataRefreshPeriod())
+ .isAfterNow();
+
+ if (isServerViewInitialized &&
+ !wasRecentFailure &&
+ (!segmentsNeedingRefresh.isEmpty() || !dataSourcesNeedingRebuild.isEmpty()) &&
+ (refreshImmediately || nextRefresh < System.currentTimeMillis())) {
+ // We need to do a refresh. Break out of the waiting loop.
+ break;
}
- segmentsToRefresh.addAll(segmentsNeedingRefresh);
- segmentsNeedingRefresh.clear();
-
- // Mutable segments need a refresh every period, since new columns could be added dynamically.
- segmentsNeedingRefresh.addAll(mutableSegments);
+ if (isServerViewInitialized) {
+ // Server view is initialized, but we don't need to do a refresh. Could happen if there are
+ // no segments in the system yet. Just mark us as initialized, then.
+ initialized.countDown();
+ }
- lastFailure = 0L;
- lastRefresh = System.currentTimeMillis();
- refreshImmediately = false;
+ // Wait some more, we'll wake up when it might be time to do another refresh.
+ lock.wait(Math.max(1, nextRefresh - System.currentTimeMillis()));
}
- // Refresh the segments.
- final Set<SegmentId> refreshed = refreshSegments(segmentsToRefresh);
+ segmentsToRefresh.addAll(segmentsNeedingRefresh);
+ segmentsNeedingRefresh.clear();
- synchronized (lock) {
- // Add missing segments back to the refresh list.
- segmentsNeedingRefresh.addAll(Sets.difference(segmentsToRefresh, refreshed));
+ // Mutable segments need a refresh every period, since new columns could be added dynamically.
+ segmentsNeedingRefresh.addAll(mutableSegments);
- // Compute the list of dataSources to rebuild tables for.
- dataSourcesToRebuild.addAll(dataSourcesNeedingRebuild);
- refreshed.forEach(segment -> dataSourcesToRebuild.add(segment.getDataSource()));
- dataSourcesNeedingRebuild.clear();
+ lastFailure = 0L;
+ lastRefresh = System.currentTimeMillis();
+ refreshImmediately = false;
+ }
- lock.notifyAll();
- }
+ // Refresh the segments.
+ final Set<SegmentId> refreshed = refreshSegments(segmentsToRefresh);
- // Rebuild the dataSources.
- for (String dataSource : dataSourcesToRebuild) {
- final DruidTable druidTable = buildDruidTable(dataSource);
- final DruidTable oldTable = tables.put(dataSource, druidTable);
- if (oldTable == null || !oldTable.getRowSignature().equals(druidTable.getRowSignature())) {
- log.info("dataSource [%s] has new signature: %s.", dataSource, druidTable.getRowSignature());
- } else {
- log.debug("dataSource [%s] signature is unchanged.", dataSource);
- }
- }
+ synchronized (lock) {
+ // Add missing segments back to the refresh list.
+ segmentsNeedingRefresh.addAll(Sets.difference(segmentsToRefresh, refreshed));
- initialized.countDown();
- }
- catch (InterruptedException e) {
- // Fall through.
- throw e;
+ // Compute the list of dataSources to rebuild tables for.
+ dataSourcesToRebuild.addAll(dataSourcesNeedingRebuild);
+ refreshed.forEach(segment -> dataSourcesToRebuild.add(segment.getDataSource()));
+ dataSourcesNeedingRebuild.clear();
+
+ lock.notifyAll();
}
- catch (Exception e) {
- log.warn(e, "Metadata refresh failed, trying again soon.");
-
- synchronized (lock) {
- // Add our segments and dataSources back to their refresh and rebuild lists.
- segmentsNeedingRefresh.addAll(segmentsToRefresh);
- dataSourcesNeedingRebuild.addAll(dataSourcesToRebuild);
- lastFailure = System.currentTimeMillis();
- lock.notifyAll();
+
+ // Rebuild the dataSources.
+ for (String dataSource : dataSourcesToRebuild) {
+ final DruidTable druidTable = buildDruidTable(dataSource);
+ final DruidTable oldTable = tables.put(dataSource, druidTable);
+ if (oldTable == null || !oldTable.getRowSignature().equals(druidTable.getRowSignature())) {
+ log.info("dataSource [%s] has new signature: %s.", dataSource, druidTable.getRowSignature());
+ } else {
+ log.debug("dataSource [%s] signature is unchanged.", dataSource);
}
}
+
+ initialized.countDown();
+ }
+ catch (InterruptedException e) {
+ // Fall through.
+ throw e;
+ }
+ catch (Exception e) {
+ log.warn(e, "Metadata refresh failed, trying again soon.");
+
+ synchronized (lock) {
+ // Add our segments and dataSources back to their refresh and rebuild lists.
+ segmentsNeedingRefresh.addAll(segmentsToRefresh);
+ dataSourcesNeedingRebuild.addAll(dataSourcesToRebuild);
+ lastFailure = System.currentTimeMillis();
+ lock.notifyAll();
+ }
}
- }
- catch (InterruptedException e) {
- // Just exit.
- }
- catch (Throwable e) {
- // Throwables that fall out to here (not caught by an inner try/catch) are potentially gnarly, like
- // OOMEs. Anyway, let's just emit an alert and stop refreshing metadata.
- log.makeAlert(e, "Metadata refresh failed permanently").emit();
- throw e;
- }
- finally {
- log.info("Metadata refresh stopped.");
}
}
+ catch (InterruptedException e) {
+ // Just exit.
+ }
+ catch (Throwable e) {
+ // Throwables that fall out to here (not caught by an inner try/catch) are potentially gnarly, like
+ // OOMEs. Anyway, let's just emit an alert and stop refreshing metadata.
+ log.makeAlert(e, "Metadata refresh failed permanently").emit();
+ throw e;
+ }
+ finally {
+ log.info("Metadata refresh stopped.");
+ }
+ }
+ );
+
+ ScheduledExecutors.scheduleWithFixedDelay(
Review comment:
Why not do this as part of the loop in the main thread?
##########
File path: processing/src/main/java/org/apache/druid/query/DataSource.java
##########
@@ -35,7 +35,8 @@
@JsonSubTypes.Type(value = UnionDataSource.class, name = "union"),
@JsonSubTypes.Type(value = JoinDataSource.class, name = "join"),
@JsonSubTypes.Type(value = LookupDataSource.class, name = "lookup"),
- @JsonSubTypes.Type(value = InlineDataSource.class, name = "inline")
+ @JsonSubTypes.Type(value = InlineDataSource.class, name = "inline"),
+ @JsonSubTypes.Type(value = GlobalTableDataSource.class, name = "global")
Review comment:
1. I think `globalTable` would be a better name. We only have one chance to get it right!
2. IMO for some consistency between SQL and native, we'll need to either transparently globalify the regular `table` type (perhaps a rewrite step like ClientQuerySegmentWalker's inlining?) or we'll need to document the `globalTable` type. I think the former is nicer, because the latter comes with too many caveats (you have to make sure to use it in the proper conditions).
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/schema/DruidSchema.java
##########
@@ -616,6 +631,12 @@ private DruidTable buildDruidTable(final String dataSource)
final RowSignature.Builder builder = RowSignature.builder();
columnTypes.forEach(builder::add);
+ if (broadcastDatasources.contains(dataSource)) {
Review comment:
tiny nit: the logic is laid out a bit weirdly here; it'd make more sense to emphasize what's different by having the dataSource be created in the if block, but the DruidTable created outside of it.
##########
File path: sql/src/main/java/org/apache/druid/sql/calcite/schema/DruidSchema.java
##########
@@ -122,6 +128,8 @@
// All dataSources that need tables regenerated.
private final Set<String> dataSourcesNeedingRebuild = new HashSet<>();
+ private final Set<String> broadcastDatasources = new HashSet<>();
Review comment:
This should be `@GuardedBy("lock")`, and so should `dataSourcesNeedingRebuild`, `mutableSegments`, `segmentsNeedingRefresh`, `refreshImmediately`, `lastRefresh`, `lastFailure`, and `isServerViewInitialized`.
Could you please add those, and also remove the comment on `lock`, which is woefully out of date. (Thanks in advance for the housekeeping work.)
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