hdfs_开发者

Using encryption with Hadoop

The Cloudera documentation says that Hadoop does not support on disk encryption.Would it be possible to use hardware encrypted hard drives wit开发者_StackOverflow社区h Hadoop?eCryptfs can be used to d[详细]

2023-04-10 20:32 分类：问答

How can I fetch Images from HBase

I have around 1 Gig of image .png files in my HDFS. Can anyone suggest me a way to store the index va开发者_开发问答lues to these images in HBase and retrieve the image by querying HBase. Or how can I[详细]

2023-04-03 02:00 分类：问答

How to expose the task tracker/Job tracker webinterface to the public in hadoop?

I\'m trying to monitor different cluster nodes, but everytime I have to ssh -X to the node and start the browser to take a look at the status information.[详细]

2023-04-02 05:48 分类：问答

Running Hadoop MapReduce, is it possible to call external executables outside of HDFS

Within my mapper I\'d like to call external software installed on the worker node outside of the HDFS.Is this possible?What is the best way to do this?[详细]

2023-04-01 23:07 分类：问答

HDFS path changing when trying to update files in HDFS

I am new to Hadoop and HDFS, so maybe it is something I am doing wrong when I copy from local (Ubuntu 10.04) to HDFS on a single node on localhost.The initial copy works fine, but when I modify my loc[详细]

2023-03-31 22:57 分类：问答

setCompressOutput in Hadoop

When should use and not to use FileOutputFormat.setCompressOutpu开发者_Python百科t(conf, true);? I heard that it compresses mapper output. Is there any possibility to compress reducer side output?[详细]

2023-03-31 20:45 分类：问答

Parallel Copy to HDFS

What is the best and fast way to achieve parallel copy to h开发者_C百科adoop from an NFS mount? We have a mount with huge number of files and we need to copy it into hdfs.[详细]

2023-03-28 03:00 分类：问答

How does hive/hadoop assures that each mapper works on data that is local for it?

2 basic questions that trouble me: How can I be sure that each of the 32 files hive uses to store my tables sits on its unique machine?[详细]

2023-03-26 08:49 分类：问答

Programmatic equivalent of 'hadoop fs -tail -f'

I want to tail an hdfs file programmatically using the org.apache.hadoop.fs.FileSystem API. Is there a way to tail the file using the API in a way which is equivalent to hadoop fs开发者_JS百科 -tail -[详细]

2023-03-24 02:25 分类：问答