codelipenghui commented on code in PR #17948:
URL: https://github.com/apache/pulsar/pull/17948#discussion_r990609784
##########
pulsar-common/src/main/java/org/apache/pulsar/common/protocol/schema/SchemaHash.java:
##########
@@ -55,15 +82,118 @@ public static SchemaHash of(SchemaData schemaData) {
}
public static SchemaHash of(SchemaInfo schemaInfo) {
- return of(schemaInfo == null ? new byte[0] : schemaInfo.getSchema(),
+ return of(schemaInfo == null ? null : schemaInfo.getSchema(),
schemaInfo == null ? null : schemaInfo.getType());
}
- public static SchemaHash of(byte[] schemaBytes, SchemaType schemaType) {
- return new SchemaHash(hashFunction.hashBytes(schemaBytes), schemaType);
+ public static SchemaHash of() {
+ return of(null, null);
+ }
+
+ private static SchemaHash of(byte[] schemaBytes, SchemaType schemaType) {
+ SchemaHash result = null;
+ if (schemaBytes == null || schemaBytes.length == 0) {
+ result = EmptySchemaHashFactory.get(schemaType);
+ }
+
+ // This should not be a common occurrence if everything goes well.
+ if (result == null) {
+ log.warn("Could not get schemaHash from EmptySchemaHashFactory,
will create by hashFunction. Might bring"
+ + " performance regression. schemaBytes length:{},
schemaType:{}",
+ schemaBytes == null ? "null" : schemaBytes.length,
schemaType);
+ result = new SchemaHash(
+ hashFunction.hashBytes(schemaBytes == null ? new byte[0] :
schemaBytes), schemaType);
+ }
+ return result;
}
public byte[] asBytes() {
return hash.asBytes();
}
+
+ private static class EmptySchemaHashFactory {
+ private static final HashCode EMPTY_HASH = hashFunction.hashBytes(new
byte[0]);
+ private static final SchemaHash NONE_SCHEMA_HASH = new
SchemaHash(EMPTY_HASH, NONE);
+ private static final SchemaHash STRING_SCHEMA_HASH = new
SchemaHash(EMPTY_HASH, STRING);
+ private static final SchemaHash JSON_SCHEMA_HASH = new
SchemaHash(EMPTY_HASH, JSON);
Review Comment:
We only need to handle the primitive schema? The schema data of the struct
schema is not empty, we can't use EMPTY_HASH here.
##########
pulsar-common/src/main/java/org/apache/pulsar/common/protocol/schema/SchemaHash.java:
##########
@@ -55,15 +82,118 @@ public static SchemaHash of(SchemaData schemaData) {
}
public static SchemaHash of(SchemaInfo schemaInfo) {
- return of(schemaInfo == null ? new byte[0] : schemaInfo.getSchema(),
+ return of(schemaInfo == null ? null : schemaInfo.getSchema(),
schemaInfo == null ? null : schemaInfo.getType());
}
- public static SchemaHash of(byte[] schemaBytes, SchemaType schemaType) {
- return new SchemaHash(hashFunction.hashBytes(schemaBytes), schemaType);
+ public static SchemaHash of() {
+ return of(null, null);
+ }
+
+ private static SchemaHash of(byte[] schemaBytes, SchemaType schemaType) {
+ SchemaHash result = null;
+ if (schemaBytes == null || schemaBytes.length == 0) {
+ result = EmptySchemaHashFactory.get(schemaType);
+ }
+
+ // This should not be a common occurrence if everything goes well.
+ if (result == null) {
+ log.warn("Could not get schemaHash from EmptySchemaHashFactory,
will create by hashFunction. Might bring"
+ + " performance regression. schemaBytes length:{},
schemaType:{}",
Review Comment:
For a struct schema, it should be normal case, we don't need the warning log
for the normal cases.
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