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Haohui Mai commented on HDFS-9201: ---------------------------------- My understanding is that they are simply syntactic sugars. Can you please post the bytecode and the jitted assembly? Having 5% in microbenchmarks looks nice, but how does it impact real-world use case? Is it a premature optimization? > Namenode Performance Improvement : Using for loop without iterator > ------------------------------------------------------------------ > > Key: HDFS-9201 > URL: https://issues.apache.org/jira/browse/HDFS-9201 > Project: Hadoop HDFS > Issue Type: Improvement > Reporter: nijel > Assignee: nijel > Labels: namenode, performance > Attachments: HDFS-9201_draft.patch > > > As discussed in HBASE-12023, the for each loop syntax will create few extra > objects and garbage. > For arrays and Lists can change to the traditional syntax. > This can improve memory foot print and can result in performance gain. -- This message was sent by Atlassian JIRA (v6.3.4#6332)