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YARN-11836. Fixed AM log fetching with YARN CLI #7813

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@p-szucs p-szucs commented Jul 17, 2025

Change-Id: I04678a04503e01e67f1075f3fc543887cf80ac47

Description of PR

YARN-10767 introduced a bug, where YARN Logs CLI is unable to fetch the AM logs using "-am" option if the user is not in the Admin ACLs.

This commit changed the logic for requesting the AM logs and it fetches the "id" of the active RM from the HA service, and requesting the logs from there.

Reproduction:

The issue can be reproduced by calling "yarn logs -applicationId ‹appId› -am 1" command with a user who has not got admin access.

In the RM logs of the test cluster I can see the following error, which states that the user doesn't have permission to call 'getServiceState':

IPC Server handler 0 on default port 8033, call Call#3 Retry#0 org.apache.hadoop.ha.HAServiceProtocol.getServiceStatus
org.apache.hadoop.security.AccessControlException: User systest doesn't have permission to call 'getServiceState'
at org.apache.hadoop.yarn.server.resourcemanager.RMServerUtils.verifyAdminAccess(RMServerUtils.java:433)
at org.apache.hadoop.yarn.server.resourcemanager.RMServerUtils.verifyAdminAccess(RMServerUtils.java:398)
at org.apache.hadoop.yarn.server.resourcemanager.AdminService.checkAccess(AdminService.java:243)
at org.apache.hadoop.yarn.server.resourcemanager.AdminService.getServiceStatus(AdminService.java:396)
at org.apache.hadoop.ha.protocolPB.HAServiceProtocolServerSideTranslatorPB.getServiceStatus(HAServiceProtocolServerSideTranslatorPB.java:148)
at org.apache.hadoop.ha.proto.HAServiceProtocolProtos$HAServiceProtocolService$2.callBlockingMethod(HAServiceProtocolProtos.java:6154)
at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:621)
at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:589)
at org.apache.hadoop.ipc.ProtobufRpcEngine2$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine2.java:573)
at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1227)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1247)
at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:1170)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:422)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1964)
at org.apache.hadoop.ipc.Server$Handler.run(Server.java:3200)

Currently in WebAppUtils's execOnActiveRM method we throw an exception when RMHAUtils.findActiveRMHAId returns null here, stating that "No active RM is available". However that method will return null if the permissions are missing to check the service states. I think at this point we could fall back to the original code here, and try to find the active RM by iterating through them. 

The issue only happens in HA mode, and only if we use "-am" option, without this option the AM logs can be retrieved together with the aggregated logs.

How was this patch tested?

Tested manually on a cluster by fetching application logs

  • with and without "-am" option
  • HA and non-HA mode
  • with admin/non-admin user

The aggregated logs and AM logs could be fetched in every cases.

When I stopped the first RM, and the user could not check the active one, we found it when the connection timed out after 30 retries. With admin user it could find the active one for the first time

For code changes:

  • Does the title or this PR starts with the corresponding JIRA issue id (e.g. 'HADOOP-17799. Your PR title ...')?
  • Object storage: have the integration tests been executed and the endpoint declared according to the connector-specific documentation?
  • If adding new dependencies to the code, are these dependencies licensed in a way that is compatible for inclusion under ASF 2.0?
  • If applicable, have you updated the LICENSE, LICENSE-binary, NOTICE-binary files?

Change-Id: I04678a04503e01e67f1075f3fc543887cf80ac47
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@p-szucs p-szucs marked this pull request as ready for review July 18, 2025 12:45
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Thanks @p-szucs for identify the problem and try to fix it.
I think the basic idea is good, i just had some NIT code style comment

int haIndex = 0;
int activeRMIndex = 0;
int rmCount = 1;

if (HAUtil.isHAEnabled(conf)) {
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What if we try some early return pattern?

if (!HAUtil.isHAEnabled(conf)) {
  // If i understand right here we have just 1 RM so we can just try with that
  String rmAddress = getRMWebAppURLWithScheme(conf, 0);
  return func.apply(rmAddress, arg);
}
// try RMHAUtils.findActiveRMHAId(conf)
// if null do the iteration
// finally apply and return

Maybe will be a bit easyer to read cause now we have the

int activeRMIndex = 0;
int rmCount = 1;

code what related to non HA, than HA code, than some mix.

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Thanks, I agree. Fixed

if (HAUtil.isHAEnabled(conf)) {
ArrayList<String> rmIds = (ArrayList<String>) HAUtil.getRMHAIds(conf);
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Can we cast to simple List interface here? Maybe will be a bit more robust.

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Fixed

String rmAddress = getRMWebAppURLWithScheme(conf, i);
return func.apply(rmAddress, arg);
} catch (Exception e) {
// Ignore and try next RM if there are any
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Maybe some trace level LOG can be use full

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Fixed

Change-Id: Ia7a864fa77901dd63d193e0e9f0ccaab3674a75d
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p-szucs commented Jul 24, 2025

Thanks for your suggestions @K0K0V0K, I updated the patch with the fixes to your comments

Change-Id: I35b0904be1c12e57349cc7a473a0d70ba38c6482
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Change-Id: I76250565144f8f010ece1ef9d3781259fbae4c26
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Thanks @p-szucs for the fix! LGTM.

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