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From "Abin Shahab (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-6080) rtmax and wtmax for NFS-hdfs-gateway should be configurable
Date Sun, 09 Mar 2014 02:53:43 GMT
Abin Shahab created HDFS-6080:
---------------------------------

             Summary: rtmax and wtmax for NFS-hdfs-gateway should be configurable
                 Key: HDFS-6080
                 URL: https://issues.apache.org/jira/browse/HDFS-6080
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Abin Shahab
            Assignee: Abin Shahab


Right now rtmax and wtmax are hardcoded in RpcProgramNFS3. These dictate the maximum read
and write capacity of the server. Therefore, these affect the read and write performance.

We ran performance tests with 1mb, 100mb, and 1GB files. We noticed significant performance
decline with the size increase when compared to fuse. We realized that the issue was with
the hardcoded rtmax size(64k). 
When we increased the rtmax to 1MB, we got a 10x improvement in performance.

NFS reads:
+---------------+------------+---------------+---------------+---------------+--------------------+----------------------+
| File          | Size       | Run 1         | Run 2         | Run 3         | Average   
        | Std. Dev.            |
| testFile100Mb | 104857600  | 23.131158137  | 19.24552955   | 19.793332866  | 20.723340184333335
| 1.7172094782219731   |
| testFile1Gb   | 1073741824 | 219.108776636 | 201.064032255 | 217.433909843 | 212.53557291133333
| 8.14037175506561     |
| testFile1Mb   | 1048576    | 0.330546906   | 0.256391808   | 0.28730168    | 0.2914134646666667
| 0.030412987573361663 |
+---------------+------------+---------------+---------------+---------------+--------------------+----------------------+
Fuse reads:
+---------------+------------+-------------+--------------+--------------+--------------------+-----------------------+
| File          | Size       | Run 1       | Run 2        | Run 3        | Average       
    | Std. Dev.             |
| testFile100Mb | 104857600  | 2.394459443 | 2.695265191  | 2.50046517   | 2.5300632679999997
| 0.12457410127142007   |
| testFile1Gb   | 1073741824 | 25.03324924 | 24.155102554 | 24.901525525 | 24.696625772999997
| 0.386672412437576     |
| testFile1Mb   | 1048576    | 0.271615094 | 0.270835986  | 0.271796438  | 0.2714158393333333
| 0.0004166483951065848 |
+---------------+------------+-------------+--------------+--------------+--------------------+-----------------------+
(NFS read after rtmax = 1MB)
+---------------+------------+--------------+-------------+--------------+---------------------+-----------------+
| File          | Size       | Run 1        | Run 2       | Run 3        | Average       
     | Std. Dev.            |
| testFile100Mb | 104857600  | 3.655261869  | 3.438676067 | 3.557464787  | 3.5504675743333336
 | 0.0885591069882058   |
| testFile1Gb   | 1073741824 | 34.663612417 | 37.32089122 | 37.997718857 | 36.660740831333335
 | 1.4389615098060426   |
| testFile1Mb   | 1048576    | 0.115602858  | 0.106826253 | 0.125229976  | 0.11588636233333334
| 0.007515962395481867 |
+---------------+------------+--------------+-------------+--------------+---------------------+-----------------+



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