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Zhe Zhang commented on HDFS-7891: --------------------------------- Thanks for the analysis Nicholas. I guess you are assuming a placement policy of LN+LR+RR_1+RR_2...? The current {{BlockPlacementPolicyDefault}} looks like LN+RR_1+RR_1 > A block placement policy with best fault tolerance > -------------------------------------------------- > > Key: HDFS-7891 > URL: https://issues.apache.org/jira/browse/HDFS-7891 > Project: Hadoop HDFS > Issue Type: Sub-task > Reporter: Walter Su > Assignee: Walter Su > Attachments: HDFS-7891.002.patch, HDFS-7891.003.patch, > HDFS-7891.004.patch, HDFS-7891.patch, PlacementPolicyBenchmark.txt, > testresult.txt > > > a block placement policy tries its best to place replicas to most racks. -- This message was sent by Atlassian JIRA (v6.3.4#6332)