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Merge pull request #18355 from mikemccand/iterables_flatten 

Iterables.flatten should not pre-cache the first iterator
This commit is contained in:
Michael McCandless 2016-05-15 10:21:35 -04:00
parent d865910c13 48dca45564
commit 0d570352dd
4 changed files with 39 additions and 5 deletions
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2
core/src/main/java/org/elasticsearch/common/util/iterable/Iterables.java
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@ -54,6 +54,8 @@ public class Iterables {
}
}
/** Flattens the two level {@code Iterable} into a single {@code Iterable}. Note that this pre-caches the values from the outer {@code
* Iterable}, but not the values from the inner one. */
public static <T> Iterable<T> flatten(Iterable<? extends Iterable<T>> inputs) {
Objects.requireNonNull(inputs);
return new FlattenedIterables<>(inputs);

2
core/src/main/java/org/elasticsearch/indices/IndexingMemoryController.java
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@ -93,7 +93,7 @@ public class IndexingMemoryController extends AbstractComponent implements Index
private final ShardsIndicesStatusChecker statusChecker;
IndexingMemoryController(Settings settings, ThreadPool threadPool, Iterable<IndexShard>indexServices) {
IndexingMemoryController(Settings settings, ThreadPool threadPool, Iterable<IndexShard> indexServices) {
this(settings, threadPool, indexServices, JvmInfo.jvmInfo().getMem().getHeapMax().bytes());
}

4
core/src/main/java/org/elasticsearch/indices/IndicesService.java
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@ -181,7 +181,9 @@ public class IndicesService extends AbstractLifecycleComponent<IndicesService> i
this.namedWriteableRegistry = namedWriteableRegistry;
clusterSettings.addSettingsUpdateConsumer(IndexStoreConfig.INDICES_STORE_THROTTLE_TYPE_SETTING, indexStoreConfig::setRateLimitingType);
clusterSettings.addSettingsUpdateConsumer(IndexStoreConfig.INDICES_STORE_THROTTLE_MAX_BYTES_PER_SEC_SETTING, indexStoreConfig::setRateLimitingThrottle);
indexingMemoryController = new IndexingMemoryController(settings, threadPool, Iterables.flatten(this));
indexingMemoryController = new IndexingMemoryController(settings, threadPool,
// ensure we pull an iter with new shards - flatten makes a copy
() -> Iterables.flatten(this).iterator());
this.indexScopeSetting = indexScopedSettings;
this.circuitBreakerService = circuitBreakerService;
this.indicesFieldDataCache = new IndicesFieldDataCache(settings, new IndexFieldDataCache.Listener() {

34
core/src/test/java/org/elasticsearch/common/util/iterable/IterablesTests.java
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@ -19,12 +19,14 @@
package org.elasticsearch.common.util.iterable;
import org.elasticsearch.test.ESTestCase;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import org.elasticsearch.test.ESTestCase;
import static org.hamcrest.object.HasToString.hasToString;
public class IterablesTests extends ESTestCase {
@ -56,6 +58,34 @@ public class IterablesTests extends ESTestCase {
test(iterable);
}
public void testFlatten() {
List<List<Integer>> list = new ArrayList<>();
list.add(new ArrayList<>());
Iterable<Integer> allInts = Iterables.flatten(list);
int count = 0;
for(int x : allInts) {
count++;
}
assertEquals(0, count);
list.add(new ArrayList<>());
list.get(1).add(0);
// changes to the outer list are not seen since flatten pre-caches outer list on init:
count = 0;
for(int x : allInts) {
count++;
}
assertEquals(0, count);
// but changes to the original inner lists are seen:
list.get(0).add(0);
for(int x : allInts) {
count++;
}
assertEquals(1, count);
}
private void test(Iterable<String> iterable) {
try {
Iterables.get(iterable, -1);