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https://issues.apache.org/jira/browse/HDFS-14277?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16768706#comment-16768706
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Erik Krogen commented on HDFS-14277:
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Okay, interesting. Seems that it's at least worth looking into.
> [SBN read] Observer benchmark results
> -------------------------------------
>
> Key: HDFS-14277
> URL: https://issues.apache.org/jira/browse/HDFS-14277
> Project: Hadoop HDFS
> Issue Type: Task
> Components: ha, namenode
> Affects Versions: 3.3.0
> Environment: Hardware: 4-node cluster, each node has 4 core, Xeon
> 2.5Ghz, 25GB memory.
> Software: CentOS 7.4, CDH 6.0 + Consistent Reads from Standby, Kerberos, SSL,
> RPC encryption + Data Transfer Encryption, Cloudera Navigator.
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Major
> Attachments: Observer profiler.png, Screen Shot 2019-02-14 at
> 11.50.37 AM.png, observer RPC queue processing time.png
>
>
> Ran a few benchmarks and profiler (VisualVM) today on an Observer-enabled
> cluster. Would like to share the results with the community. The cluster has
> 1 Observer node.
> h2. NNThroughputBenchmark
> Generate 1 million files and send fileStatus RPCs.
> {code:java}
> hadoop org.apache.hadoop.hdfs.server.namenode.NNThroughputBenchmark -fs
> <namenode> -op fileStatus -threads 100 -files 1000000 -useExisting
> -keepResults
> {code}
> h3. Kerberos, SSL, RPC encryption, Data Transfer Encryption enabled:
> ||Node||fileStatus (Ops per sec)||
> |Active NameNode|4865|
> |Observer|3996|
> h3. Kerberos, SSL:
> ||Node||fileStatus (Ops per sec)||
> |Active NameNode|7078|
> |Observer|6459|
> Observation:
> * due to the edit tailing overhead, Observer node consume 30% CPU
> utilization even if the cluster is idle.
> * While Active NN has less than 1ms RPC processing time, Observer node has >
> 5ms RPC processing time. I am still looking for the source of the longer
> processing time. The longer RPC processing time may be the cause for the
> performance degradation compared to that of Active NN. Note the cluster has
> Cloudera Navigator installed which adds additional overhead to RPC processing
> time.
> * {{GlobalStateIdContext#isCoordinatedCall()}} pops up as one of the top
> hotspots in the profiler.
>
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