Tassapol Athiapinya created YARN-2297:
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Summary: Preemption can hang in corner case by not allowing any
task container to proceed.
Key: YARN-2297
URL: https://issues.apache.org/jira/browse/YARN-2297
Project: Hadoop YARN
Issue Type: Bug
Components: capacityscheduler
Affects Versions: 2.5.0
Reporter: Tassapol Athiapinya
Priority: Critical
Preemption can cause hang issue in single-node cluster. Only AMs run. No task
container can run.
h3. queue configuration
Queue A/B has 1% and 99% respectively.
No max capacity.
h3. scenario
Turn on preemption. Configure 1 NM with 4 GB of memory. Use only 2 apps. Use 1
user.
Submit app 1 to queue A. AM needs 2 GB. There is 1 task that needs 2 GB. Occupy
entire cluster.
Submit app 2 to queue B. AM needs 2 GB. There are 3 tasks that need 2 GB each.
Instead of entire app 1 preempted, app 1 AM will stay. App 2 AM will launch. No
task of either app can proceed.
h3. commands
/usr/lib/hadoop/bin/hadoop jar
/usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar randomtextwriter
"-Dmapreduce.map.memory.mb=2000"
"-Dyarn.app.mapreduce.am.command-opts=-Xmx1800M"
"-Dmapreduce.randomtextwriter.bytespermap=2147483648"
"-Dmapreduce.job.queuename=A" "-Dmapreduce.map.maxattempts=100"
"-Dmapreduce.am.max-attempts=1" "-Dyarn.app.mapreduce.am.resource.mb=2000"
"-Dmapreduce.map.java.opts=-Xmx1800M"
"-Dmapreduce.randomtextwriter.mapsperhost=1"
"-Dmapreduce.randomtextwriter.totalbytes=2147483648" dir1
/usr/lib/hadoop/bin/hadoop jar
/usr/lib/hadoop-mapreduce/hadoop-mapreduce-client-jobclient-tests.jar sleep
"-Dmapreduce.map.memory.mb=2000"
"-Dyarn.app.mapreduce.am.command-opts=-Xmx1800M" "-Dmapreduce.job.queuename=B"
"-Dmapreduce.map.maxattempts=100" "-Dmapreduce.am.max-attempts=1"
"-Dyarn.app.mapreduce.am.resource.mb=2000"
"-Dmapreduce.map.java.opts=-Xmx1800M" -m 1 -r 0 -mt 4000 -rt 0
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