While I'm installing and trying to Druid, I realized that there is a mistake in the document and this mistake causes the error. On this page https://docs.cloudera.com/HDPDocuments/HDP3/HDP-3.0.1/adding-druid/content/druid_query_druid.html in step one, it said to create a file and named as wickiticker-top.json. But in step 2, when the HTTP query is made, the name of the file is written as wikiticker-top.json. Yesterday I'm trying to execute this command and it gave me an error. Then I realized that the name of the file is written wrongly. After I edit the name of the file, everything is worked as I expected but this situation took my time. To avoid other people having the same problem, it should be edited as soon as possible.