showuon commented on a change in pull request #9121:
URL: https://github.com/apache/kafka/pull/9121#discussion_r475393747
##########
File path:
streams/src/test/java/org/apache/kafka/streams/processor/internals/GlobalStateManagerImplTest.java
##########
@@ -180,6 +183,27 @@ public void shouldReadCheckpointOffsets() throws
IOException {
assertEquals(expected, offsets);
}
+ @Test
+ public void shouldLogWarningMessageWhenIOExceptionInCheckPoint() throws
IOException {
+ final Map<TopicPartition, Long> offsets = Collections.singletonMap(t1,
25L);
+ stateManager.initialize();
+ stateManager.updateChangelogOffsets(offsets);
+
+ final File file = new File(stateDirectory.globalStateDir(),
StateManagerUtil.CHECKPOINT_FILE_NAME + ".tmp");
Review comment:
It's because we we will write data to the .tmp file first and then swap
to the CHECKPOINT_FILE. And in the swap action, we use `Files.move` with
`ATOMIC_MOVE` option, which will try to replace the target file if exists. I
added comments for this line to explain the reason. Thank you.
ref:
https://docs.oracle.com/javase/8/docs/api/java/nio/file/Files.html#move-java.nio.file.Path-java.nio.file.Path-java.nio.file.CopyOption...-
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