caching - How to make sure shdfs Centralized Cache is working -


i wonder if hdfs dfs copytolocal <file1> <file2> way test hdfs read caching configured properly.

in experiment, did not see reasonable improvement of copying out 1gb <file1> local directory, after directory of <file1> added hdfs cache. time complete copy 17sec, before , after <file1> added cache.

<file1> verified added cache via listdirective -stats command.

appreciate help.

including output of hdfs dfsadmin -report useful.

increasing ulimit , setting dfs.datanode.max.locked.memory

http://hadoop.apache.org/docs/r2.3.0/hadoop-project-dist/hadoop-hdfs/centralizedcachemanagement.html


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