[jira] [Updated] (HDFS-8555) Random read support on HDFS files using Indexed Namenode feature

["amit sehga (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-8555?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

amit sehga updated HDFS-8555:
-----------------------------
    Summary: Random read support on HDFS files using Indexed Namenode feature  (was: Random access support on HDFS files using Indexed Namenode feature)

> Random read support on HDFS files using Indexed Namenode feature
> ----------------------------------------------------------------
>
>                 Key: HDFS-8555
>                 URL: https://issues.apache.org/jira/browse/HDFS-8555
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: HDFS, hdfs-client, namenode
>    Affects Versions: 2.5.2
>         Environment: Linux
>            Reporter: amit sehga
>            Assignee: amit sehga
>             Fix For: 3.0.0
>
>   Original Estimate: 720h
>  Remaining Estimate: 720h
>
> Currently Namenode does not provide support to do random reads. With so many tools built on top of HDFS solving the use case of Exploratory BI and providing SQL over HDFS. The need of hour is to reduce the number of blocks read for a Random read. 
> E.g. extracting say 10 lines worth of information out of 100GB files should be reading only those block which can potentially have those 10 lines.
> This can be achieved by adding a tagging feature per block in name node, each block written to HDFS will have tags associated to it stored in index.
> Namednode when access via the Indexing feature will use this index native to reduce the no. of block returned to the client.



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