Thank you for looking at my question.

Sometimes errors occur in the process of inquiring campaign information.

Error "NoRouteToHostException" and code "UNAVAILABLE" are returned.

However, I looked up the log and it seems to automatically retry in the 
"UNAVAILABLE" code error situation.

=======================================================
Response
--------
Headers: null
Body: null
Failure message: null
Status: Status{code=UNAVAILABLE, description=io exception, 
cause=io.grpc.netty.shaded.io.netty.channel.AbstractChannel$AnnotatedNoRouteToHostException:
 
null: googleads.googleapis.com/2404:6800:4005:81c:0:0:0:200a:443
Caused by: java.net.NoRouteToHostException
at 
io.grpc.netty.shaded.io.netty.channel.unix.Errors.newConnectException0(Errors.java:147)
at 
io.grpc.netty.shaded.io.netty.channel.unix.Errors.handleConnectErrno(Errors.java:128)
at 
io.grpc.netty.shaded.io.netty.channel.unix.Socket.connect(Socket.java:313)
at 
io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel.doConnect0(AbstractEpollChannel.java:773)
at 
io.grpc.netty.shaded.io.netty.channel.epoll.EpollSocketChannel.doConnect0(EpollSocketChannel.java:144)
at 
io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel.doConnect(AbstractEpollChannel.java:758)
at 
io.grpc.netty.shaded.io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.connect(AbstractEpollChannel.java:600)
at 
io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.connect(DefaultChannelPipeline.java:1342)
at 
io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:548)
at 
io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.connect(AbstractChannelHandlerContext.java:533)
at 
io.grpc.netty.shaded.io.netty.channel.ChannelDuplexHandler.connect(ChannelDuplexHandler.java:54)
at 
io.grpc.netty.shaded.io.grpc.netty.WriteBufferingAndExceptionHandler.connect(WriteBufferingAndExceptionHandler.java:157)
at 
io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeConnect(AbstractChannelHandlerContext.java:548)
at 
io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.access$1000(AbstractChannelHandlerContext.java:61)
at 
io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext$9.run(AbstractChannelHandlerContext.java:538)
at 
io.grpc.netty.shaded.io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:174)
at 
io.grpc.netty.shaded.io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:167)
at 
io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
at 
io.grpc.netty.shaded.io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:391)
at 
io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
at 
io.grpc.netty.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at 
io.grpc.netty.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:750)
}.
=======================================================
▶ WARN  2023-06-09 12:14:30.629 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:159] - FAILURE 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: null, 
ResponseCode: UNAVAILABLE, Fault: io exception.
▶ WARN  2023-06-09 12:14:31.553 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:159] - FAILURE 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: null, 
ResponseCode: UNAVAILABLE, Fault: io exception.
▶ WARN  2023-06-09 12:14:31.966 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:159] - FAILURE 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: null, 
ResponseCode: UNAVAILABLE, Fault: io exception.
▶ WARN  2023-06-09 12:14:39.793 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:159] - FAILURE 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: null, 
ResponseCode: UNAVAILABLE, Fault: io exception.
▶ WARN  2023-06-09 12:14:45.906 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:159] - FAILURE 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: null, 
ResponseCode: UNAVAILABLE, Fault: io exception.
▶ WARN  2023-06-09 12:14:59.060 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:159] - FAILURE 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: null, 
ResponseCode: UNAVAILABLE, Fault: io exception.
▶ WARN  2023-06-09 12:15:06.664 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:159] - FAILURE 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: null, 
ResponseCode: UNAVAILABLE, Fault: io exception.
▶ WARN  2023-06-09 12:15:25.597 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:159] - FAILURE 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: null, 
ResponseCode: UNAVAILABLE, Fault: io exception.
▶ INFO  2023-06-09 12:15:44.210 [grpc-default-executor-23] 
com.google.ads.googleads.lib.request.summary[logAtLevel:157] - SUCCESS 
REQUEST SUMMARY. Method: 
google.ads.googleads.v13.services.GoogleAdsService/Search, Endpoint: 
googleads.googleapis.com:443, CustomerID: 1000997080, RequestID: 
N0kAGKKNa8VkcaRolWiWDw, ResponseCode: OK, Fault: null.
======================================================

If you look at the log, it looks like you're trying a total of nine times 
until you succeed.

Am I right in guessing?

If the guess is correct, can I know the maximum number of retries I try?

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