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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8469) Lockfiles are not being created for datanode storage directories
Date Fri, 22 May 2015 19:04:17 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8469?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Colin Patrick McCabe updated HDFS-8469:
---------------------------------------
    Status: Patch Available  (was: Open)

> Lockfiles are not being created for datanode storage directories
> ----------------------------------------------------------------
>
>                 Key: HDFS-8469
>                 URL: https://issues.apache.org/jira/browse/HDFS-8469
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>            Reporter: Colin Patrick McCabe
>            Assignee: Colin Patrick McCabe
>         Attachments: HDFS-8469.001.patch
>
>
> Lockfiles are not being created for datanode storage directories.  Due to a mixup, we
are initializing the StorageDirectory class with shared=true (an option which was only intended
for NFS directories used to implement NameNode HA).  Setting shared=true disables lockfile
generation and prints a log message like this:
> {code}
> 2015-05-22 11:45:16,367 INFO  common.Storage (Storage.java:lock(675)) - Locking is disabled
for /home/cmccabe/hadoop2/hadoop-hdfs-project/hadoop-hdfs/target/  test/data/dfs/data/data5/current/BP-122766180-127.0.0.1-1432320314834
> {code}
> Without lock files, we could accidentally spawn two datanode processes using the same
directories without realizing it.



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