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https://issues.apache.org/jira/browse/HDFS-9836?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15158436#comment-15158436
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Inigo Goiri commented on HDFS-9836:
-----------------------------------
We cannot return null in {{getConnectionId()}} as {{Client}} does:
{code}
Preconditions.checkState(callId.get() == null);
{code}
We need to return a fake {{ConnectionId}} or something like that.
> RequestHedgingInvocationHandler can't be cast to
> org.apache.hadoop.ipc.RpcInvocationHandler
> -------------------------------------------------------------------------------------------
>
> Key: HDFS-9836
> URL: https://issues.apache.org/jira/browse/HDFS-9836
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: ha
> Affects Versions: 2.8.0
> Reporter: Guocui Mi
> Assignee: Guocui Mi
> Attachments: HDFS-9836-000.patch, HDFS-9836-001.patch
>
>
> RequestHedgingInvocationHandler cannot be cast to
> org.apache.hadoop.ipc.RpcInvocationHandler
> Reproduce steps:
> 1: Set client failover provider as RequestHedgingProxyProvider.
> <property>
> <name>dfs.client.failover.proxy.provider.[nameservice]</name>
>
> <value>org.apache.hadoop.hdfs.server.namenode.ha.RequestHedgingProxyProvider</value>
> </property>
> 2: run hdfs fsck / will get following exceptions.
> Exception in thread "main" java.lang.ClassCastException:
> org.apache.hadoop.hdfs.server.namenode.ha.RequestHedgingProxyProvider$RequestHedgingInvocationHandler
> cannot be cast to org.apache.hadoop.ipc.RpcInvocationHandler
> at org.apache.hadoop.ipc.RPC.getConnectionIdForProxy(RPC.java:613)
> at
> org.apache.hadoop.io.retry.RetryInvocationHandler.getConnectionId(RetryInvocationHandler.java:281)
> at org.apache.hadoop.ipc.RPC.getConnectionIdForProxy(RPC.java:615)
> at org.apache.hadoop.ipc.RPC.getServerAddress(RPC.java:598)
> at org.apache.hadoop.hdfs.HAUtil.getAddressOfActive(HAUtil.java:380)
> at
> org.apache.hadoop.hdfs.tools.DFSck.getCurrentNamenodeAddress(DFSck.java:248)
> at org.apache.hadoop.hdfs.tools.DFSck.doWork(DFSck.java:255)
> at org.apache.hadoop.hdfs.tools.DFSck.access$000(DFSck.java:72)
> at org.apache.hadoop.hdfs.tools.DFSck$1.run(DFSck.java:148)
> at org.apache.hadoop.hdfs.tools.DFSck$1.run(DFSck.java:145)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at
> org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1671)
> at org.apache.hadoop.hdfs.tools.DFSck.run(DFSck.java:144)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
> at org.apache.hadoop.hdfs.tools.DFSck.main(DFSck.java:360)
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