symious commented on a change in pull request #2172:
URL: https://github.com/apache/ozone/pull/2172#discussion_r620153806
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File path:
hadoop-ozone/recon/src/main/java/org/apache/hadoop/ozone/recon/scm/ReconContainerManager.java
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@@ -122,26 +122,87 @@ public void checkAndAddNewContainer(ContainerID
containerID,
scmClient.getContainerWithPipeline(containerID.getId());
LOG.debug("Verified new container from SCM {}, {} ",
containerID, containerWithPipeline.getPipeline().getId());
- // If no other client added this, go ahead and add this container.
- if (!containerExist(containerID)) {
- addNewContainer(containerID.getId(), containerWithPipeline);
- }
+ // no need call "containerExist" to check, because
+ // 1 containerExist and addNewContainer can not be atomic
+ // 2 addNewContainer will double check the existence
Review comment:
"check the existence and add" isn't meant to be an atomic operation
here, it's just used to avoid some unnecessary operations if the other clients
have updated the containerId already.
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