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https://issues.apache.org/jira/browse/FLINK-5530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15826548#comment-15826548
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ASF GitHub Bot commented on FLINK-5530:
---------------------------------------
Github user zentol commented on a diff in the pull request:
https://github.com/apache/flink/pull/3143#discussion_r96476317
--- Diff:
flink-contrib/flink-statebackend-rocksdb/src/main/java/org/apache/flink/contrib/streaming/state/AbstractRocksDBState.java
---
@@ -132,55 +132,95 @@ 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 this
contain garbage
--- End diff --
this -> thus?
> race condition in AbstractRocksDBState#getSerializedValue
> ---------------------------------------------------------
>
> Key: FLINK-5530
> URL: https://issues.apache.org/jira/browse/FLINK-5530
> Project: Flink
> Issue Type: Bug
> Components: Queryable State
> Affects Versions: 1.2.0
> Reporter: Nico Kruber
> Assignee: Nico Kruber
> Priority: Blocker
>
> AbstractRocksDBState#getSerializedValue() uses the same key serialisation
> stream as the ordinary state access methods but is called in parallel during
> state queries thus violating the assumption of only one thread accessing it.
> This may lead to either wrong results in queries or corrupt data while
> queries are executed.
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