[GitHub] [zookeeper] sonatype-lift[bot] commented on a diff in pull request #1961: ZOOKEEPER-4571: Admin server API for restore database from a snapshot

Tue, 13 Dec 2022 17:28:14 -0800 


sonatype-lift[bot] commented on code in PR #1961:
URL: https://github.com/apache/zookeeper/pull/1961#discussion_r1047914987


##########
zookeeper-server/src/main/java/org/apache/zookeeper/server/ZKDatabase.java:
##########
@@ -620,6 +623,48 @@ public void deserializeSnapshot(InputArchive ia) throws 
IOException {
         initialized = true;
     }
 
+    /**
+     * Deserialize a snapshot that contains FileHeader from an input archive. 
It is used by
+     * the admin restore command.
+     *
+     * @param ia the input archive to deserialize from
+     * @param is the CheckInputStream to check integrity
+     *
+     * @throws IOException
+     */
+    public synchronized void deserializeSnapshot(final InputArchive ia, final 
CheckedInputStream is) throws IOException {
+        // clear the zkDatabase
+        clear();

Review Comment:
   *THREAD_SAFETY_VIOLATION:*  Read/Write race. Non-private method 
`ZKDatabase.deserializeSnapshot(...)` indirectly reads with synchronization 
from `this.dataTree`. Potentially races with unsynchronized write in method 
`ZKDatabase.clear()`.
    Reporting because this access may occur on a background thread.
   
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