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Posted to common-issues@hadoop.apache.org by Weiqi Xu <xu...@tju.edu.cn> on 2020/04/01 03:24:29 UTC
The output of NNbench
Hi Expert,
I am using NNbench to test the namenode performance, there are the outputs
of NNbench:
-------------- NNBench -------------- :
Version: NameNode Benchmark 0.4
Date & time: 2020-03-31 16:48:53,15
Test Operation: create_write
Start time: 2020-03-31 16:43:42,359
Maps to run: 1
Reduces to run: 1
Block Size (bytes): 1048576
Bytes to write: 1
Bytes per checksum: 1
Number of files: 8000
Replication factor: 3
Successful file operations: 8000
# maps that missed the barrier: 0
# exceptions: 0
TPS: Create/Write/Close: 53
Avg exec time (ms): Create/Write/Close: 37.688375
Avg Lat (ms): Create/Write: 9.927625
Avg Lat (ms): Close: 27.692125
RAW DATA: AL Total #1: 79421
RAW DATA: AL Total #2: 221537
RAW DATA: TPS Total (ms): 301507
RAW DATA: Longest Map Time (ms): 301507.0
RAW DATA: Late maps: 0
RAW DATA: # of exceptions: 0
----------------------------------------------------------------
My question is: whats mean of the outputs? Especially “# maps that missed
the barrier，RAW DATA: AL Total #1，RAW DATA: Late maps”. Can you give me some
detailed explanations? Please!
Thanks a lot!!!
Weiqi Xu
xuweiqi@tju.edu.cn
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