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HDFS-12143. Improve performance of getting and removing inode features. Contributed by Daryn Sharp.

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This commit is contained in:
Kihwal Lee 2017-07-25 10:28:57 -05:00
parent cca51e916b
commit 1a79dcfc45
1 changed files with 17 additions and 7 deletions
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24
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/INodeWithAdditionalFields.java
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@ -283,12 +283,14 @@ protected void addFeature(Feature f) {
protected void removeFeature(Feature f) {
int size = features.length;
Preconditions.checkState(size > 0, "Feature "
+ f.getClass().getSimpleName() + " not found.");
if (size == 0) {
throwFeatureNotFoundException(f);
}
if (size == 1) {
Preconditions.checkState(features[0] == f, "Feature "
+ f.getClass().getSimpleName() + " not found.");
if (features[0] != f) {
throwFeatureNotFoundException(f);
}
features = EMPTY_FEATURE;
return;
}
@ -307,14 +309,22 @@ protected void removeFeature(Feature f) {
}
}
Preconditions.checkState(!overflow && j == size - 1, "Feature "
+ f.getClass().getSimpleName() + " not found.");
if (overflow || j != size - 1) {
throwFeatureNotFoundException(f);
}
features = arr;
}
private void throwFeatureNotFoundException(Feature f) {
throw new IllegalStateException(
"Feature " + f.getClass().getSimpleName() + " not found.");
}
protected <T extends Feature> T getFeature(Class<? extends Feature> clazz) {
Preconditions.checkArgument(clazz != null);
for (Feature f : features) {
final int size = features.length;
for (int i=0; i < size; i++) {
Feature f = features[i];
if (clazz.isAssignableFrom(f.getClass())) {
@SuppressWarnings("unchecked")
T ret = (T) f;