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https://issues.apache.org/jira/browse/HDFS-14108?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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BELUGA BEHR updated HDFS-14108:
-------------------------------
Attachment: HDFS-14108.1.patch
> BlockManager Data Structures
> ----------------------------
>
> Key: HDFS-14108
> URL: https://issues.apache.org/jira/browse/HDFS-14108
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs
> Affects Versions: 3.2.0
> Reporter: BELUGA BEHR
> Assignee: BELUGA BEHR
> Priority: Minor
> Attachments: HDFS-14108.1.patch
>
>
> # Prefer {{ArrayList}} to {{LinkedList}} when simply adding/iterating
> # Prefer {{HashSet}} to {{TreeSet}} when no ordering is required
> # Other performance improvements
> # Check style fixes
> https://stackoverflow.com/questions/322715/when-to-use-linkedlist-over-arraylist-in-java
> {code:java}
> final Set<Node> excludedNodes = new HashSet<>();
> for(BlockReconstructionWork rw : reconWork){
> // Do no bother wasting time clearing out the collection, let GC do
> that work later
> excludedNodes.clear();
> // use {{addAll}} here
> for (DatanodeDescriptor dn : rw.getContainingNodes()) {
> excludedNodes.add(dn);
> }
> {code}
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