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https://issues.apache.org/jira/browse/YARN-6494?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16103113#comment-16103113
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Shane Kumpf commented on YARN-6494:
-----------------------------------
Thanks for the patch [~Jaeboo]! I do have a concern as this automatically bind
mounts the dn socket in every container if short circuit reads are enabled. I
still feel this should be handled via YARN-5534 (or the "auto bind mount list"
approach, if that is pursued). Additionally, in a traditional HDFS cluster, we
only have one DataNode process per server, is it safe to have multiple DNs on a
single server interacting with this socket?
> add mounting of HDFS Short-Circuit path for docker containers
> -------------------------------------------------------------
>
> Key: YARN-6494
> URL: https://issues.apache.org/jira/browse/YARN-6494
> Project: Hadoop YARN
> Issue Type: Sub-task
> Components: nodemanager
> Reporter: Jaeboo Jeong
> Assignee: Jaeboo Jeong
> Attachments: YARN-6494.001.patch, YARN-6494.002.patch
>
>
> Currently there is a error message about HDFS short-circuit when docker
> container start.
> {code}
> WARN [main] org.apache.hadoop.hdfs.shortcircuit.DomainSocketFactory: error
> creating DomainSocket
> java.net.ConnectException: connect(2) error: No such file or directory when
> trying to connect to ‘xxxxxxx’
> at org.apache.hadoop.net.unix.DomainSocket.connect0(Native Method)
> at org.apache.hadoop.net.unix.DomainSocket.connect(DomainSocket.java:250)
> at
> org.apache.hadoop.hdfs.shortcircuit.DomainSocketFactory.createSocket(DomainSocketFactory.java:164)
> at
> org.apache.hadoop.hdfs.BlockReaderFactory.nextDomainPeer(BlockReaderFactory.java:752)
> ...
> {code}
> if dfs.client.read.shortcircuit is true and dfs.domain.socket.path isn't
> equal “”, we need to mount volume for short-circuit path.
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