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HADOOP-14938. Configuration.updatingResource map should be initialized lazily (misha@cloudera.com via rkanter)

This commit is contained in:
Robert Kanter 2017-10-13 13:52:58 -07:00
parent 7a27c2c367
commit e163f41850
1 changed files with 55 additions and 38 deletions
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43
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java
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@ -290,9 +290,9 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
/**
* Stores the mapping of key to the resource which modifies or loads
* the key most recently
* the key most recently. Created lazily to avoid wasting memory.
*/
private Map<String, String[]> updatingResource;
private volatile Map<String, String[]> updatingResource;
/**
* Specify exact input factory to avoid time finding correct one.
@ -749,7 +749,6 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
*/
public Configuration(boolean loadDefaults) {
this.loadDefaults = loadDefaults;
updatingResource = new ConcurrentHashMap<String, String[]>();
// Register all classes holding property tags with
REGISTERED_TAG_CLASS.put("core", CorePropertyTag.class);
@ -778,8 +777,10 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
this.overlay = (Properties)other.overlay.clone();
}
if (other.updatingResource != null) {
this.updatingResource = new ConcurrentHashMap<String, String[]>(
other.updatingResource);
}
this.finalParameters = Collections.newSetFromMap(
new ConcurrentHashMap<String, Boolean>());
this.finalParameters.addAll(other.finalParameters);
@ -1277,14 +1278,14 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
String newSource = (source == null ? "programmatically" : source);
if (!isDeprecated(name)) {
updatingResource.put(name, new String[] {newSource});
putIntoUpdatingResource(name, new String[] {newSource});
String[] altNames = getAlternativeNames(name);
if(altNames != null) {
for(String n: altNames) {
if(!n.equals(name)) {
getOverlay().setProperty(n, value);
getProps().setProperty(n, value);
updatingResource.put(n, new String[] {newSource});
putIntoUpdatingResource(n, new String[] {newSource});
}
}
}
@ -1295,7 +1296,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
for(String n : names) {
getOverlay().setProperty(n, value);
getProps().setProperty(n, value);
updatingResource.put(n, new String[] {altSource});
putIntoUpdatingResource(n, new String[] {altSource});
}
}
}
@ -2634,12 +2635,13 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
protected synchronized Properties getProps() {
if (properties == null) {
properties = new Properties();
Map<String, String[]> backup =
new ConcurrentHashMap<String, String[]>(updatingResource);
Map<String, String[]> backup = updatingResource != null ?
new ConcurrentHashMap<String, String[]>(updatingResource) : null;
loadResources(properties, resources, quietmode);
if (overlay != null) {
properties.putAll(overlay);
if (backup != null) {
for (Map.Entry<Object, Object> item : overlay.entrySet()) {
String key = (String) item.getKey();
String[] source = backup.get(key);
@ -2649,6 +2651,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
}
}
}
}
return properties;
}
@ -3061,7 +3064,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
if (!finalParameters.contains(attr)) {
properties.setProperty(attr, value);
if (source != null) {
updatingResource.put(attr, source);
putIntoUpdatingResource(attr, source);
}
} else {
// This is a final parameter so check for overrides.
@ -3366,7 +3369,8 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
redactor.redact(name, config.get(name)));
jsonGen.writeBooleanField("isFinal",
config.finalParameters.contains(name));
String[] resources = config.updatingResource.get(name);
String[] resources = config.updatingResource != null ?
config.updatingResource.get(name) : null;
String resource = UNKNOWN_RESOURCE;
if (resources != null && resources.length > 0) {
resource = resources[0];
@ -3449,7 +3453,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
set(key, value);
String sources[] = WritableUtils.readCompressedStringArray(in);
if (sources != null) {
updatingResource.put(key, sources);
putIntoUpdatingResource(key, sources);
}
}
}
@ -3462,8 +3466,8 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
for(Map.Entry<Object, Object> item: props.entrySet()) {
org.apache.hadoop.io.Text.writeString(out, (String) item.getKey());
org.apache.hadoop.io.Text.writeString(out, (String) item.getValue());
WritableUtils.writeCompressedStringArray(out,
updatingResource.get(item.getKey()));
WritableUtils.writeCompressedStringArray(out, updatingResource != null ?
updatingResource.get(item.getKey()) : null);
}
}
@ -3563,4 +3567,17 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
}
return tag;
}
private void putIntoUpdatingResource(String key, String[] value) {
Map<String, String[]> localUR = updatingResource;
if (localUR == null) {
synchronized (this) {
localUR = updatingResource;
if (localUR == null) {
updatingResource = localUR = new ConcurrentHashMap<>(8);
}
}
}
localUR.put(key, value);
}
}