i just suffered from this. you should change the parameter in hdfs-site.xml   <property> <name>dfs.block.invalidate.limit</name> <value>50000</value> </property>   the default value is 1000 , which is too slow may be you should also change report size, if you have exception about that   <property> <name>ipc.maximum.data.length</name> <value>1073741824</value> </property>       ... View more