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https://issues.apache.org/jira/browse/YARN-10107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17024417#comment-17024417
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Szilard Nemeth commented on YARN-10107:
---------------------------------------
During internal end-to-end testing, I found the following issue:
Configuration:
- GPU is enabled
- yarn.nodemanager.resource-plugins.gpu.path-to-discovery-executables is set to
"/usr/bin/ls" - Any existing valid binary file
- yarn.nodemanager.resource-plugins.gpu.allowed-gpu-devices is set to
"0:0,1:1,2:2", so auto-discovery is turned off.
If REST endpoint
http://quasar-tsjqpq-3.vpc.cloudera.com:8042/ws/v1/node/resources/yarn.io%2Fgpu
is called, the following exception is thrown in NM:
{code:java}
2020-01-23 07:55:24,803 ERROR
org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.GpuResourcePlugin:
Failed to find GPU discovery executable, please double check
yarn.nodemanager.resource-plugins.gpu.path-to-discovery-executables setting.
org.apache.hadoop.yarn.exceptions.YarnException: Failed to find GPU discovery
executable, please double check
yarn.nodemanager.resource-plugins.gpu.path-to-discovery-executables setting.
at
org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.NvidiaBinaryHelper.getGpuDeviceInformation(NvidiaBinaryHelper.java:54)
at
org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.GpuDiscoverer.getGpuDeviceInformation(GpuDiscoverer.java:125)
at
org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.GpuResourcePlugin.getNMResourceInfo(GpuResourcePlugin.java:104)
at
org.apache.hadoop.yarn.server.nodemanager.webapp.NMWebServices.getNMResourceInfo(NMWebServices.java:515)
{code}
Let's break this down:
1.
org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.GpuResourcePlugin#getNMResourceInfo
just calls to the
{code:java}
gpuDeviceInformation = gpuDiscoverer.getGpuDeviceInformation();
{code}
2. In
org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.GpuDiscoverer#getGpuDeviceInformation,
the following calls to the NvidiaBinaryHelper.getGpuDeviceInformation:
{code:java}
try {
lastDiscoveredGpuInformation =
nvidiaBinaryHelper.getGpuDeviceInformation(pathOfGpuBinary);
} catch (IOException e) {
{code}
3.
org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.NvidiaBinaryHelper#getGpuDeviceInformation
finally throws the exception.
This is only happens in case of the parameter called "pathOfGpuBinary" is null.
Since this method is only called from GpuDiscoverer#getGpuDeviceInformation,
that passes it's field called "pathOfGpuBinary" as the only one parameter, we
can be sure if this field is null, then we have the exception.
4. The only method that can set the "pathOfGpuBinary" fields is with this call
chain:
{code:java}
GpuDiscoverer.lookUpAutoDiscoveryBinary(Configuration)
(org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu)
GpuDiscoverer.initialize(Configuration, NvidiaBinaryHelper)
(org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu)
{code}
5. GpuDiscoverer#initialize contains this code:
{code:java}
if (isAutoDiscoveryEnabled()) {
numOfErrorExecutionSinceLastSucceed = 0;
lookUpAutoDiscoveryBinary(config);
....
{code}
, so
org.apache.hadoop.yarn.server.nodemanager.containermanager.resourceplugin.gpu.GpuDiscoverer#pathOfGpuBinary
is set ONLY IF auto discovery is enabled.
Since our tests don't have auto discovery enabled, we have this exception. In
this sense, the exception message is very misleading for me:
{code:java}
Failed to find GPU discovery executable, please double check
yarn.nodemanager.resource-plugins.gpu.path-to-discovery-executables setting.
{code}
Related jira: https://issues.apache.org/jira/browse/YARN-9337
> Invoking NMWebServices#getNMResourceInfo tries to execute gpu discovery
> binary even if auto discovery is turned off
> -------------------------------------------------------------------------------------------------------------------
>
> Key: YARN-10107
> URL: https://issues.apache.org/jira/browse/YARN-10107
> Project: Hadoop YARN
> Issue Type: Bug
> Reporter: Szilard Nemeth
> Assignee: Szilard Nemeth
> Priority: Major
>
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