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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-8469) Lockfiles are not being created for datanode storage directories
Date Fri, 22 May 2015 18:55:17 GMT
Colin Patrick McCabe created HDFS-8469:
------------------------------------------

             Summary: 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


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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