otterc opened a new pull request, #41225:
URL: https://github.com/apache/spark/pull/41225
### What changes were proposed in this pull request?
This change fixes a bug with push-based shuffle when encryption is enabled
on the server. The meta requests for push-merged blocks fail with NPE:
```
java.lang.RuntimeException: java.lang.NullPointerException
at
org.apache.spark.network.server.AbstractAuthRpcHandler.getMergedBlockMetaReqHandler(AbstractAuthRpcHandler.java:110)
at
org.apache.spark.network.crypto.AuthRpcHandler.getMergedBlockMetaReqHandler(AuthRpcHandler.java:144)
at
org.apache.spark.network.server.TransportRequestHandler.processMergedBlockMetaRequest(TransportRequestHandler.java:275)
at
org.apache.spark.network.server.TransportRequestHandler.handle(TransportRequestHandler.java:117)
at
org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:140)
at
org.apache.spark.network.server.TransportChannelHandler.channelRead0(TransportChannelHandler.java:53)
at
org.sparkproject.io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:99)
at
org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at
org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at
org.sparkproject.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at
org.sparkproject.io.netty.handler.timeout.IdleStateHandler.channelRead(IdleStateHandler.java:286)
```
The change here fixes this issue.
### Why are the changes needed?
It is a bug fix for push-based shuffle.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Added a simple UT. Verified manually.
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