kellen commented on code in PR #29537:
URL: https://github.com/apache/beam/pull/29537#discussion_r1406748127
##########
sdks/java/io/hadoop-common/src/main/java/org/apache/beam/sdk/io/hadoop/SerializableConfiguration.java:
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@@ -49,34 +52,40 @@ public SerializableConfiguration(Configuration conf) {
if (conf == null) {
throw new NullPointerException("Configuration must not be null.");
}
+ this.confMutated = true;
this.conf = conf;
}
public Configuration get() {
- if (serializationCache != null) {
- serializationCache = null;
- }
+ // get() call returns the original conf, which is mutable by caller
+ confMutated = true;
return conf;
}
@Override
public void writeExternal(ObjectOutput out) throws IOException {
- if (serializationCache == null) {
- ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
- try (DataOutputStream dos = new DataOutputStream(baos)) {
- conf.write(dos);
- serializationCache = baos.toByteArray();
+ String canonicalName;
+ synchronized (this) {
+ canonicalName = conf.getClass().getCanonicalName();
+ if (confMutated) {
+ confMutated = false;
+ ByteArrayOutputStream baos = new ByteArrayOutputStream(512);
+ try (DataOutputStream dos = new DataOutputStream(baos)) {
+ // this call is slow.
+ conf.write(dos);
+ serializationCache = baos.toByteArray();
Review Comment:
Actually with this implementation, synchronization is not required unless
`conf.write` will explode if there is some concurrent modification.
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