linyiqun commented on a change in pull request #678: HDDS-3179 Pipeline
placement based on Topology does not have fallback
URL: https://github.com/apache/hadoop-ozone/pull/678#discussion_r392655689
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File path:
hadoop-hdds/server-scm/src/main/java/org/apache/hadoop/hdds/scm/pipeline/PipelinePlacementPolicy.java
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@@ -292,10 +294,15 @@ DatanodeDetails fallBackPickNodes(
int nodesToFind = nodesRequired - results.size();
for (int x = 0; x < nodesToFind; x++) {
// Pick remaining nodes based on the existence of rack awareness.
- DatanodeDetails pick = rackAwareness
- ? chooseNodeFromNetworkTopology(
- nodeManager.getClusterNetworkTopologyMap(), anchor, exclude)
- : fallBackPickNodes(healthyNodes, exclude);
+ DatanodeDetails pick;
+ try {
+ pick = rackAwareness
+ ? chooseNodeFromNetworkTopology(
+ nodeManager.getClusterNetworkTopologyMap(), anchor, exclude)
+ : fallBackPickNodes(healthyNodes, exclude);
+ } catch (SCMException e) {
Review comment:
I also meet this issue in my testing cluster.
I would like to log the exception in debug level log here. Then we could
know the fallback happened.
Also can we log the debug log for final pick node when returned is null?
if (pick != null) {
results.add(pick);
...
} else {
LOG.debug("Pick node is null, exclude {}, anchor {}.",
exclude, anchor);
}
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