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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