Is it normal for Alluxio master to have verbose output dynamically

Question

I'm using Alluxio 2.0 to accelerate compute layer's performance.

When no query is performing, I found there are about verbose netty output appendding to $Alluxio_home/logs/master.log.

2019-11-25 10:26:32,141 DEBUG NettyServerHandler - {} {} HEADERS: streamId={} headers={} streamDependency={} weight={} exclusive={} padding={} endStream={}
2019-11-25 10:26:32,141 DEBUG NettyServerHandler - {} {} DATA: streamId={} padding={} endStream={} length={} bytes={}

Dozens of above message are appeneded to master.log each second. Is it a normal behavior? If sure, what's it used for? For heartbeat amoung components?

Answer 1

I found the root cause, leave this thread here for anyone who might encounter the same problem.

The Alluxio is using gRPC as its RPC framework and the latter is based on netty, the verbose output is actually from netty, check this thread for details.

To disable the verbose output from Alluxio side, add below statement to $Alluxio_home/conf/alluxio-site.properties:

log4j.logger.io.grpc.netty.NettyServerHandler=OFF

Note that modify log4j.rootLogger of alluxio-propeties can't disable this verbose output.