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From "Mich Talebzadeh" <m...@peridale.co.uk>
Subject RE: File search by hashes in Hadoop
Date Thu, 21 Jan 2016 22:09:21 GMT
Thanks Ritesh

 

 

I see there are two options here

 

1.    Use UNIX like commands on hdfs to find the relevant files

hdfs dfs -ls -R |grep sales

drwxr-xr-x   - hduser supergroup          0 2015-12-27 06:02 sales

-rw-r--r--   2 hduser supergroup          0 2015-12-27 06:02 sales/_SUCCESS

 

2.    Index based searching using Apache Lucene.

 

a.    Download Apache Lucene. For example lucene-5.4.0.gz. gunzip it, move it to lucene-5.4.0.tar
and untar it. 2 minutes job

b.  Create LUCENE_HOME somewhere where you untarred the files --> export LUCENE_HOME=/usr/lib/lucene

c.     Make sure that your CLASSPATH has the following jar files

d.  CLASSPATH=$CLASSPATH:${LUCENE_HOME}/core/lucene-core-5.4.0.jar:${LUCENE_HOME}/demo/lucene-demo-5.4.0.jar:${LUCENE_HOME}/analysis/common/lucene-analyzers-common-5.4.0.jar:${LUCENE_HOME}/queryparser/lucene-queryparser-5.4.0.jar

e.    Create an index for the directory you want to search. In my case $HADOOP_HOME/etc/Hadoop.
When you run the java code below, you will see a directory called index created where you
ran the command

f.  java -cp $CLASSPATH org.apache.lucene.demo.IndexFiles -docs $HADOOP_HOME/etc/hadoop

g.    Then you can conduct search in index directory. For example I am looking for word ‘yarn’

h.  java -cp $CLASSPATH org.apache.lucene.demo.SearchFiles

Enter query:

yarn

Searching for: yarn

9 total matching documents

1. /home/hduser/hadoop-2.6.0/etc/hadoop/keep/mapred-site.xml

2. /home/hduser/hadoop-2.6.0/etc/hadoop/yarn-env.cmd

3. /home/hduser/hadoop-2.6.0/etc/hadoop/yarn-env.sh

4. /home/hduser/hadoop-2.6.0/etc/hadoop/mapred-site.xml_ok

5. /home/hduser/hadoop-2.6.0/etc/hadoop/yarn-site.xml

6. /home/hduser/hadoop-2.6.0/etc/hadoop/mapred-site.xml

7. /home/hduser/hadoop-2.6.0/etc/hadoop/mapred-site.xml_pre

8. /home/hduser/hadoop-2.6.0/etc/hadoop/hadoop-policy.xml

9. /home/hduser/hadoop-2.6.0/etc/hadoop/log4j.properties

Press (q)uit or enter number to jump to a page.

 

Pretty useful

 

 

Dr Mich Talebzadeh

 

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From: Ritesh Kumar Singh [mailto:riteshoneinamillion@gmail.com] 
Sent: 21 January 2016 17:10
To: user@hive.apache.org
Subject: Re: File search by hashes in Hadoop

 

Yes, it's possible to do both

1. Index based searching : http://www.drdobbs.com/parallel/indexing-and-searching-on-a-hadoop-distr/226300241?pgno=3

2. Wildcard based / Expression based searching : https://stackoverflow.com/questions/6297533/search-find-a-file-and-file-content-in-hadoop

 

Thanks,




Ritesh Kumar Singh,

 <https://riteshtoday.wordpress.com/> https://riteshtoday.wordpress.com/

 

On Thu, Jan 21, 2016 at 4:15 PM, Mich Talebzadeh <mich@peridale.co.uk <mailto:mich@peridale.co.uk>
> wrote:

Hi all,

 

Apologies for the nature of this question. 

 

Someone asked me whether it is possible to perform file search by hashes in Hadoop.

 

I am thinking that he means wildcard searches in HDFS?

 

Anyone has ideas what file search by hash means in Hadoop?

 

regards,

 

Mich

 

 




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