Jinglun created HDFS-13388:
------------------------------
Summary: RequestHedgingProxyProvider calls multiple configured NNs
all the time
Key: HDFS-13388
URL: https://issues.apache.org/jira/browse/HDFS-13388
Project: Hadoop HDFS
Issue Type: Bug
Components: hdfs-client
Reporter: Jinglun
In HDFS-7858 RequestHedgingProxyProvider was designed to "first simultaneously
call multiple configured NNs to decide which is the active Namenode and then
for subsequent calls it will invoke the previously successful NN ." But the
current code call multiple configured NNs every time even when we already got
the successful NN.
That's because in RetryInvocationHandler.java, ProxyDescriptor's member
proxyInfo is assigned only when it is constructed or when failover occurs.
RequestHedgingProxyProvider.currentUsedProxy is null in both cases, so the only
proxy we can get is always a dynamic proxy handled by
RequestHedgingInvocationHandler.class. It handles method invoke by call
multiple configured NNs.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
