Github user uce commented on a diff in the pull request:
https://github.com/apache/flink/pull/3143#discussion_r97059850
--- Diff:
flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/AbstractRocksDBState.java
---
@@ -132,55 +132,91 @@ public void setCurrentNamespace(N namespace) {
namespaceSerializer);
int keyGroup = KeyGroupRangeAssignment.assignToKeyGroup(des.f0,
backend.getNumberOfKeyGroups());
- writeKeyWithGroupAndNamespace(keyGroup, des.f0, des.f1);
- return backend.db.get(columnFamily,
keySerializationStream.toByteArray());
+
+ // we cannot reuse the keySerializationStream member since this
method
+ // is called concurrently to the other ones and it may thus
contain garbage
+ ByteArrayOutputStreamWithPos tmpKeySerializationStream =
+ new ByteArrayOutputStreamWithPos(128);
+ DataOutputViewStreamWrapper
tmpKeySerializationDateDataOutputView =
+ new
DataOutputViewStreamWrapper(tmpKeySerializationStream);
+
+ writeKeyWithGroupAndNamespace(keyGroup, des.f0, des.f1,
+ tmpKeySerializationStream,
tmpKeySerializationDateDataOutputView);
+
+ return backend.db.get(columnFamily,
tmpKeySerializationStream.toByteArray());
}
protected void writeCurrentKeyWithGroupAndNamespace() throws
IOException {
-
writeKeyWithGroupAndNamespace(backend.getCurrentKeyGroupIndex(),
backend.getCurrentKey(), currentNamespace);
+ writeKeyWithGroupAndNamespace(
+ backend.getCurrentKeyGroupIndex(),
+ backend.getCurrentKey(),
+ currentNamespace,
+ this.keySerializationStream,
+ this.keySerializationDateDataOutputView);
}
- protected void writeKeyWithGroupAndNamespace(int keyGroup, K key, N
namespace) throws IOException {
+ protected void writeKeyWithGroupAndNamespace(
+ int keyGroup, K key, N namespace,
+ final ByteArrayOutputStreamWithPos
keySerializationStream,
+ final DataOutputView
keySerializationDateDataOutputView) throws IOException {
+
keySerializationStream.reset();
- writeKeyGroup(keyGroup);
- writeKey(key);
- writeNameSpace(namespace);
+ writeKeyGroup(keyGroup, keySerializationDateDataOutputView);
+ writeKey(key, keySerializationStream,
keySerializationDateDataOutputView);
+ writeNameSpace(namespace, keySerializationStream,
keySerializationDateDataOutputView);
}
- private void writeKeyGroup(int keyGroup) throws IOException {
+ private void writeKeyGroup(
+ int keyGroup, final DataOutputView
keySerializationDateDataOutputView)
+ throws IOException {
+
for (int i = backend.getKeyGroupPrefixBytes(); --i >= 0;) {
keySerializationDateDataOutputView.writeByte(keyGroup
>>> (i << 3));
}
}
- private void writeKey(K key) throws IOException {
+ private void writeKey(
+ K key, final ByteArrayOutputStreamWithPos
keySerializationStream,
+ final DataOutputView
keySerializationDateDataOutputView) throws IOException {
+
//write key
int beforeWrite = keySerializationStream.getPosition();
backend.getKeySerializer().serialize(key,
keySerializationDateDataOutputView);
if (ambiguousKeyPossible) {
//write size of key
- writeLengthFrom(beforeWrite);
+ writeLengthFrom(beforeWrite, keySerializationStream,
+ keySerializationDateDataOutputView);
}
}
- private void writeNameSpace(N namespace) throws IOException {
+ private void writeNameSpace(
+ N namespace, final ByteArrayOutputStreamWithPos
keySerializationStream,
+ final DataOutputView
keySerializationDateDataOutputView) throws IOException {
+
int beforeWrite = keySerializationStream.getPosition();
namespaceSerializer.serialize(namespace,
keySerializationDateDataOutputView);
if (ambiguousKeyPossible) {
//write length of namespace
- writeLengthFrom(beforeWrite);
+ writeLengthFrom(beforeWrite, keySerializationStream,
+ keySerializationDateDataOutputView);
}
}
- private void writeLengthFrom(int fromPosition) throws IOException {
+ private static void writeLengthFrom(
+ int fromPosition, final ByteArrayOutputStreamWithPos
keySerializationStream,
+ final DataOutputView
keySerializationDateDataOutputView) throws IOException {
+
int length = keySerializationStream.getPosition() -
fromPosition;
- writeVariableIntBytes(length);
+ writeVariableIntBytes(length,
keySerializationDateDataOutputView);
}
- private void writeVariableIntBytes(int value) throws IOException {
+ private static void writeVariableIntBytes(
+ int value, final DataOutputView
keySerializationDateDataOutputView)
--- End diff --
Why are the output view arguments declared `final` here and in other
methods? Usually we only mark method arguments as final if required for
anonymous classes, etc.
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
