elek commented on a change in pull request #2331:
URL: https://github.com/apache/ozone/pull/2331#discussion_r652453883
##########
File path:
hadoop-hdds/common/src/main/java/org/apache/hadoop/hdds/client/ECReplicationConfig.java
##########
@@ -36,6 +43,29 @@ public ECReplicationConfig(int data, int parity) {
this.parity = parity;
}
+ public ECReplicationConfig(String string) {
+ final Pattern pattern = Pattern.compile("(\\d+)-(\\d+)");
+ final Matcher matcher = pattern.matcher(string);
Review comment:
Good point. Let me move it to a static final constant.
Answering the question is slightly harder. Compilation time I couldn't see
any optimization:
```
javap -v org.apache.hadoop.hdds.client.ECReplicationConfig
...
public org.apache.hadoop.hdds.client.ECReplicationConfig(java.lang.String);
descriptor: (Ljava/lang/String;)V
flags: ACC_PUBLIC
Code:
stack=3, locals=4, args_size=2
0: aload_0
1: invokespecial #1 // Method
java/lang/Object."<init>":()V
4: ldc #4 // String (\d+)-(\d+)
6: invokestatic #5 // Method
java/util/regex/Pattern.compile:(Ljava/lang/String;)Ljava/util/regex/Pattern;
9: astore_2
```
The call is really compiled as is to the method.
Runtime optimization it's another question, but I don't think that it's
possible easily as hostpost JVM would require understanding about the
idempotency of `Pattern.compile` (second call on `Pattern.compile` returns with
a value which is equivalent to the first one.)
--> looks better to move the compile to a static field...
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