Bruce J Schuchardt created GEODE-8920:
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Summary: Modify debug logging to make it easier to trace a message
Key: GEODE-8920
URL: https://issues.apache.org/jira/browse/GEODE-8920
Project: Geode
Issue Type: Improvement
Components: membership
Reporter: Bruce J Schuchardt
Debug logging in DirectChannel lets us know the IDs of receivers of a message
and the toString of the message but it's very difficult to figure out what
thread on the receiving end is supposed to process that message.
Here's an example of what we currently have:
[debug 2021/02/01 16:15:17.492 PST persistgemfire8_host1_8586
<vm_9_thr_25_persist8_host1_8586> tid=0x4f0] Sending
(DLockRequestProcessor.DLockResponseMessage responding GRANT;
serviceName=__PDX(version 4); objectName=PDX_LOCK; responseCode=0;
keyIfFailed=null; leaseExpireTime=9223372036854775807; processorId=509;
lockId=509) to 1 peers
([rs-GEM-3166-PL1535a2i32xlarge-hydra-client-36(persistgemfire9_host1_8517:8517)<ec><v51>:41005])
via tcp/ip
This does not tell you anything about the receiver except its ID. On the
receiving side the thread that, in this run, would handle that message is this:
persistgemfire9_host1_8517 <P2P message reader for
rs-GEM-3166-PL1535a2i32xlarge-hydra-client-36(persistgemfire8_host1_8586:8586)<ec><v51>:41006
unshared ordered *uid=1036* dom #1 local port=47207 remote port=42068> tid=0x51
I've highlighted the *uid* here because that is the _uniqueId_ of the sending
Connection. If you looked through the logs or stack traces of the receiver and
knew the uniqueId of the sending Connection you could easily locate the thread
that should receive this DLockResponseMessage. Currently this is much harder
than it needs to be because the DirectChannel _Sending_ log message doesn't
include the _uniqueId_ of the Connections it is using to send the message.
Let's change that log message to include the _uniqueId_ of each outgoing
Connection. Maybe something like this:
Sending (message.toString()) to 1 peers (peer ID)to 1 peers (peer ID)*,
uid=1036* via tcp/ip
and on the receiving side we could be clearer about what the *uid* in the
thread's name means:
persistgemfire9_host1_8517 <P2P message reader for
rs-GEM-3166-PL1535a2i32xlarge-hydra-client-36(persistgemfire8_host1_8586:8586)<ec><v51>:41006
unshared ordered *sender uid=1036* dom #1 local port=47207 remote port=42068>
tid=0x51
or something like that.
Now we can look at the _Sending_ message and know that the receiving thread
will have _uid=1036_ in its name. Knowing this it ought to be possible to
write a program/script to trace a message and its consequences from one node to
another.
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