[jira] [Created] (HDFS-14277) [SBN read] Observer benchmark results

["Wei-Chiu Chuang (JIRA)" <ji...@apache.org>]

Wei-Chiu Chuang created HDFS-14277:
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             Summary: [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
         Attachments: 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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