[jira] [Commented] (WHIRR-656) HDFS directory creation can deadlock if the cluster being brought up is single node & preformatted

["Steve Loughran (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/WHIRR-656?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13457074#comment-13457074 ] 

Steve Loughran commented on WHIRR-656:
--------------------------------------

The install process can deadlock in directory creation

Conditions:
#there already exists a preformatted FS
#the only DN coming up is on the same machine

In this scenario, 
# the {{start_namenode()}} function can block as dfsadmin waits to come out of safemode, 
# NN will only do that once the block count is high enough 
# the DN isn't started until the NN is started
# result: deadlock

Fix: don't create the dir structure if the FS was already there.
                
> HDFS directory creation can deadlock if the cluster being brought up is single node & preformatted 
> ---------------------------------------------------------------------------------------------------
>
>                 Key: WHIRR-656
>                 URL: https://issues.apache.org/jira/browse/WHIRR-656
>             Project: Whirr
>          Issue Type: Bug
>          Components: service/hadoop
>    Affects Versions: 0.9.0
>            Reporter: Steve Loughran
>            Priority: Minor
>
> If you have a single node cluster & there already exists a pre-formatted filesystem then the cluster config process can deadlock in dfs directory creation

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