NameNode records the metadata of all the Already have an account? Sign in. Where does HDFS stores data on the local file system. I have installed Cloudera distribution of Hadoop. But can anyone tell me how to find the physical location of files residing in HDFS?
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Your answer Your name to display optional : Email me at this address if my answer is selected or commented on: Email me if my answer is selected or commented on Privacy: Your email address will only be used for sending these notifications. In that directory you can find the hdfs-site. There you find 2 properties: dfs. Reply 42, Views. So which directory should I be able to run "pig -movies. Is this method correct to specify the path of the hdfs file. Is this same for everyone.
Thanks I will look at that over the weekend. Already a User? Sign In. Don't have an account? What's New Cloudera.
Cloudera Streams Messaging 7. Product Announcements. Cloudera Data Engineering introduces bin-packing auto-scaling policy for better cost management. View More Announcements. Options The -R option will make the change recursively through the directory structure. The -h option shows sizes in human readable format.
The -v option displays a header line. The -e option shows the erasure coding policy for each file. The -s option shows the snapshot counts for each directory. Options: The -f option will overwrite the destination if it already exists. If -p is specified with no arg , then preserves timestamps, ownership, permission.
If -pa is specified, then preserves permission also because ACL is a super-set of permission. Determination of whether raw namespace extended attributes are preserved is independent of the -p flag. Options: The -s option will result in an aggregate summary of file lengths being displayed, rather than the individual files. Without the -s option, calculation is done by going 1-level deep from the given path. The -x option will exclude snapshots from the result calculation.
Note: This command is deprecated. Instead use hadoop fs -du -s. The following primary expressions are recognised: -name pattern -iname pattern Evaluates as true if the basename of the file matches the pattern using standard file system globbing. The following operators are recognised: expression -a expression expression -and expression expression expression Logical AND operator for joining two expressions. Options: -p : Preserves access and modification times, ownership and the permissions.
Options: -R: Recursively list the attributes for all files and directories. Values encoded as text strings are enclosed in double quotes " , and values encoded as hexadecimal and base64 are prefixed with 0x and 0s, respectively. Example: hadoop fs -head pathname Exit Code: Returns 0 on success and -1 on error. Instead use hadoop fs -ls -R. Options: The -p option behavior is much like Unix mkdir -p, creating parent directories along the path.
Useful when uploading a directory containing more than 1 file. This flag will result in reduced durability. Use with care. Exit Code: Returns 0 on success and -1 on error. See expunge about deletion of files in trash. Options: The -f option will not display a diagnostic message or modify the exit status to reflect an error if the file does not exist.
The -R option deletes the directory and any content under it recursively. The -r option is equivalent to -R. The -skipTrash option will bypass trash, if enabled, and delete the specified file s immediately. This can be useful when it is necessary to delete files from an over-quota directory. The -safely option will require safety confirmation before deleting directory with total number of files greater than hadoop. It can be used with -skipTrash to prevent accidental deletion of large directories.
Delay is expected when walking over large directory recursively to count the number of files to be deleted before the confirmation. Options: --ignore-fail-on-non-empty : When using wildcards, do not fail if a directory still contains files.
Instead use hadoop fs -rm -r. Options: -b: Remove all but the base ACL entries. The entries for user, group and others are retained for compatibility with permission bits. New entries are added to the ACL, and existing entries are retained. Other ACL entries are retained. If the ACL spec contains only access entries, then the existing default entries are retained. If the ACL spec contains only default entries, then the existing access entries are retained. If the ACL spec contains both access and default entries, then both are replaced.
Options: -n name: The extended attribute name. There are three different encoding methods for the value. If the argument is enclosed in double quotes, then the value is the string inside the quotes. If the argument is prefixed with 0x or 0X, then it is taken as a hexadecimal number. If the argument begins with 0s or 0S, then it is taken as a base64 encoding.
Examples: hadoop fs -setfattr -n user. Options: The -w flag requests that the command wait for the replication to complete. This can potentially take a very long time. The -R flag is accepted for backwards compatibility. It has no effect. Options: The -f option will output appended data as the file grows, as in Unix. Example: hadoop fs -tail pathname Exit Code: Returns 0 on success and -1 on error. Example: hadoop fs -test -e filename.
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