baohe-zhang commented on a change in pull request #29425:
URL: https://github.com/apache/spark/pull/29425#discussion_r476796493
##########
File path:
common/kvstore/src/main/java/org/apache/spark/util/kvstore/LevelDB.java
##########
@@ -164,35 +165,39 @@ public void writeAll(List<?> values) throws Exception {
Preconditions.checkArgument(values != null && !values.isEmpty(),
"Non-empty values required.");
- // Group by class, in case there are values from different classes in the
values
+ // Group by class, in case there are values from different classes in the
values.
// Typical usecase is for this to be a single class.
// A NullPointerException will be thrown if values contain null object.
for (Map.Entry<? extends Class<?>, ? extends List<?>> entry :
values.stream().collect(Collectors.groupingBy(Object::getClass)).entrySet()) {
-
- final Iterator<?> valueIter = entry.getValue().iterator();
- final Iterator<byte[]> serializedValueIter;
-
- // Deserialize outside synchronized block
- List<byte[]> list = new ArrayList<>(entry.getValue().size());
- for (Object value : values) {
- list.add(serializer.serialize(value));
- }
- serializedValueIter = list.iterator();
-
final Class<?> klass = entry.getKey();
- final LevelDBTypeInfo ti = getTypeInfo(klass);
- synchronized (ti) {
- final LevelDBTypeInfo.Index naturalIndex = ti.naturalIndex();
- final Collection<LevelDBTypeInfo.Index> indices = ti.indices();
+ // Partition the value list to a set of the 128-values batches. It can
reduce the
+ // memory pressure caused by serialization and give fairness to other
writing threads
+ // when writing a very large list.
+ for (List<?> batchList : Iterables.partition(entry.getValue(), 128)) {
Review comment:
Hi @gatorsmile , unit tests for HybridStore are added in
https://github.com/apache/spark/pull/29509. And the unit test for
**writeAll()** method of levelDB is added in current pr.
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