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UNIX and HDFS - file systems on same partition.

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Old 04-24-2016
UNIX and HDFS - file systems on same partition.
I am learning Hadoop. As a part of that, Hdfs - Hadoop distributed file system has commands similar to unix where we can create,copy,move files from unix/linux file system to HDFS.
My question is
1) how two file systems (unix and hdfs) can coexist on thr same partition..
2)What if block used by one FS is overwritten/ modified by another FS.
3) Who does this block handling mechanism inorder to avoid unwanted results.
4) what happens to inodes(unix) pointing to data blocks being used/blocked by HDFS.
Please explain what happens at atomic level when mutiple file systems coexists on same partition.
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LEARN ABOUT V7

findfs

FINDFS(8)						       System Administration							 FINDFS(8)

NAME

       findfs - find a filesystem by label or UUID

SYNOPSIS

       findfs NAME=value

DESCRIPTION

       findfs  will  search the block devices in the system looking for a filesystem or partition with specified tag. The currently supported tags
       are:

       LABEL=<label>
	      Specifies filesystem label.

       UUID=<uuid>
	      Specifies filesystem UUID.

       PARTUUID=<uuid>
	      Specifies partition UUID. This partition identifier is supported for example for GUID  Partition	Table (GPT) partition tables.

       PARTLABEL=<label>
	      Specifies partition label (name). The partition labels are supported for example for GUID Partition Table  (GPT)	or  MAC  partition
	      tables.

       If the filesystem or partition is found, the device name will be printed on stdout.

       The complete overview about filesystems and partitions you can get for example by

	      lsblk --fs

	      partx --show <disk>

	      blkid

EXIT STATUS

	      0      success
	      1      label or uuid cannot be found
	      2      usage error, wrong number of arguments or unknown option

AUTHOR

       findfs was originally written by Theodore Ts'o <tytso@mit.edu> and re-written for the util-linux package by Karel Zak <kzak@redhat.com>.

ENVIRONMENT

       LIBBLKID_DEBUG=all
	      enables libblkid debug output.

SEE ALSO

       blkid(8), lsblk(8), partx(8)

AVAILABILITY

       The  findfs  command  is  part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
       /util-linux/>.

util-linux							    March 2014								 FINDFS(8)