Do not use small blocks for balancing the cluster https://issues.apache.org/jira/browse/HDFS-8824     Allow Balancer to run faster https://issues.apache.org/jira/browse/HDFS-8818   平衡设置的文章:https://community.hortonworks.com/articles/43849/hdfs-balancer-2-configurations-cli-options.html   线程不够会导致平衡卡死,评论说这样改参数可以绕过 By setting dfs.balancer.moverThreads to a value big than dfs.datanode.balance.max.concurrent.moves * also works. https://issues.apache.org/jira/browse/HDFS-11377