hi i am testing mongodb performance by using ycsb-0.5.0 benchmark and i get thes

Question

hi i am testing mongodb performance by using ycsb-0.5.0 benchmark and i get these result which contain error in the read and update part ([UPDATE], Return=NOT_FOUND) i am using the default filed number = 10.

[OVERALL], RunTime(ms), 20057.0
[OVERALL], Throughput(ops/sec), 99.71580994166625
[READ], Operations, 1023.0
[READ], AverageLatency(us), 8223.466275659825
[READ], MinLatency(us), 2088.0
[READ], MaxLatency(us), 58175.0
[READ], 95thPercentileLatency(us), 19359.0
[READ], 99thPercentileLatency(us), 29999.0
[READ], Return=NOT_FOUND, 1023
[CLEANUP], Operations, 1.0
[CLEANUP], AverageLatency(us), 56176.0
[CLEANUP], MinLatency(us), 56160.0
[CLEANUP], MaxLatency(us), 56191.0
[CLEANUP], 95thPercentileLatency(us), 56191.0
[CLEANUP], 99thPercentileLatency(us), 56191.0
[UPDATE], Operations, 977.0
[UPDATE], AverageLatency(us), 9970.160696008188
[UPDATE], MinLatency(us), 2546.0
[UPDATE], MaxLatency(us), 391167.0
[UPDATE], 95thPercentileLatency(us), 21935.0
[UPDATE], 99thPercentileLatency(us), 32559.0
[UPDATE], Return=OK, 91
[UPDATE], Return=NOT_FOUND, 886

Explanation / Answer

Yahoo! Cloud System Benchmark (YCSB) may be download latest and try with it.
error in the read and update part ([UPDATE], Return=NOT_FOUND)

Here is the requested information.
Version of OS:
$ ~/YCSB/git/YCSB$ cat /etc/*-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=14.04
DISTRIB_CODENAME=trusty
DISTRIB_DESCRIPTION="Ubuntu 14.04.2 LTS"
NAME="Ubuntu"
VERSION="14.04.2 LTS, Trusty Tahr"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 14.04.2 LTS"
VERSION_ID="14.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
Version of Maven and JDK
$ ~/YCSB/git/YCSB$ mvn -version
Apache Maven 2.2.1 (rdebian-14)
Java version: 1.7.0_79
Java home: /usr/lib/jvm/java-7-openjdk-amd64/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux" version: "3.13.0-49-generic" arch: "amd64" Family: "unix"```

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