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https://issues.apache.org/jira/browse/HDFS-14550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16857389#comment-16857389
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Akira Ajisaka commented on HDFS-14550:
--------------------------------------
HDFS RBF is supported in 2.9.0+, however, we would like to route the requests
from DFSRouter to the existing Hadoop 2.7.x clusters.
> RBF: Failed to get statistics from NameNodes before 2.9.0
> ---------------------------------------------------------
>
> Key: HDFS-14550
> URL: https://issues.apache.org/jira/browse/HDFS-14550
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Akira Ajisaka
> Priority: Major
>
> DFSRouter fails to get stats from NameNodes that do not have HDFS-7877
> {noformat}
> 2019-06-03 17:40:15,407 ERROR
> org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService:
> Cannot get stat from nn1:nn01:8022 using JMX
> org.codehaus.jettison.json.JSONException:
> JSONObject["NumInMaintenanceLiveDataNodes"] not found.
> at org.codehaus.jettison.json.JSONObject.get(JSONObject.java:360)
> at org.codehaus.jettison.json.JSONObject.getInt(JSONObject.java:421)
> at
> org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService.updateJMXParameters(NamenodeHeartbeatService.java:345)
> at
> org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService.getNamenodeStatusReport(NamenodeHeartbeatService.java:278)
> at
> org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService.updateState(NamenodeHeartbeatService.java:206)
> at
> org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService.periodicInvoke(NamenodeHeartbeatService.java:160)
> at
> org.apache.hadoop.hdfs.server.federation.router.PeriodicService$1.run(PeriodicService.java:178)
> at
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
> at
> java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> {noformat}
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