Mapreduce job hang, waiting for AM container to be allocated.

[#1]

Hi Team,

Job hang while importing tables via sqoop shown following message in web UI.

ACCEPTED: waiting for AM container to be allocated, launched and register with RM

Kindly suggest.

[#2]

Hi, Nilesh. Have you checked the yarn scheduler? Is the default queue out of resource?

[#3]

@Nilesh

I will suggest yo revisit your yarn memory configuration once. Seems you might be running out of memory.

Can you please let me know what values you have set for yarn.scheduler.capacity.maximum-am-resource-percent ?

If possible please attach -

1. Yarn RM UI snap

2. yarn-site.xml

3. mapred-site.xml

4. Scheduler snap from RM UI -

http://<RM-Hostname>:8088/cluster/scheduler

[#4]

@Sagar Shimpi

yarn.scheduler.capacity.maximum-am-resource-percent=0.2

Kindly find attached file for reference.

yarn-site.xml

mapred-site.xml

[#5]

@Nilesh From the resource manager UI i see there are no "Active Nodes" running and hence the "Total Memory" in UI is displaying 0.

Can you check if your node managers are UP and communicating to RM.

[#6 · Accepted solution]

@Nilesh

There are 2 unhealthy nodes, if you click on "2" under unhealthy nodes section, you will get reason why they are unhealthy, it could be because of bad disk etc. Please check and try to check nodemanager's logs, you will get more info in there.

[#7]

@Kuldeep Kulkarni and @Sagar Shimpi

Issue has been resolved by changing below parameter in yarn-site.xml

yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage

Previously it was 90% I changed it to 99 Now Job is in running state.

Could you please shed some light on this parameter.

[#8]

@Nilesh -

yarn.nodemanager.disk-health-checker.max-disk-utilization-per-disk-percentage

The maximum percentage of disk space utilization allowed after which a disk is marked as bad. Values can range from 0.0 to 100.0. If the value is greater than or equal to 100, the nodemanager will check for full disk. This applies to yarn-nodemanager.local-dirs and yarn.nodemanager.log-dirs.

[#9]

@Kuldeep Kulkarni

How to find which disk is marked as bad?

[#10]

Generally it should be visible on RM UI once you click on the unhealthy nodes.

OR

You can go the unhealthy node(http://<unhealthy-node-manager>:8042/jmx) and check JMX