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From "Hong Zhiguo (JIRA)" <j...@apache.org>
Subject [jira] [Created] (YARN-3897) "Too many links" in NM log dir
Date Wed, 08 Jul 2015 10:27:05 GMT
Hong Zhiguo created YARN-3897:
---------------------------------

             Summary: "Too many links" in NM log dir
                 Key: YARN-3897
                 URL: https://issues.apache.org/jira/browse/YARN-3897
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Hong Zhiguo
            Assignee: Hong Zhiguo
            Priority: Minor


Users need to left container logs more than one day. On some nodes of our busy cluster, the
number of subdirs of {yarn.nodemanager.log-dirs} may reach 32000, which is the defaul limit
of ext3 file system. As a result, we got errors when initiating containers:
"Failed to create directory {yarn.nodemanager.log-dirs}/logs/application_1435111082717_1341740
- Too many links"

log aggregation is not an option for us because of the heavy pressure on namenode. With a
cluster of 5K nodes and 20k log files per node, it's not acceptable to aggregate some many
files to hdfs.

Since ext3 is still widely used, we'd better do something to avoid such error.



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