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https://issues.apache.org/jira/browse/HDFS-8678?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15616328#comment-15616328
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Ivo Udelsmann commented on HDFS-8678:
-------------------------------------
Hello,
After reading the previous comment I took the liberty of adding the
functionality to "head" the file in the available patch. Unfortunately I'm not
able to attach the patch I generated.
I'm adding it to this comment since it is very short and could spare someone
the time to implement it.
Thank you.
{code}
diff --git
a/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.html
b/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.html
index ad8c374..3700a5e 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.html
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.html
@@ -57,8 +57,17 @@
<h4 class="modal-title" id="file-info-title">File information</h4>
</div>
<div class="modal-body" id="file-info-body">
- <a id="file-info-download">Download</a>
- <!--<a id="file-info-preview" style="cursor:pointer">Tail the file
(last 32K)</a>-->
+ <div class=row>
+ <span class="col-xs-4">
+ <a id="file-info-download">Download</a>
+ </span>
+ <span class="col-xs-4">
+ <a id="file-info-preview-head" style="cursor:pointer">Head the
file (first 32K)</a>
+ </span>
+ <span class="col-xs-4">
+ <a id="file-info-preview-tail" style="cursor:pointer">Tail the
file (last 32K)</a>
+ </span>
+ </div>
<hr />
<div class="panel panel-success" id="file-info-blockinfo-panel">
<div class="panel-heading">
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.js
b/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.js
index 1739db2..3e276a9 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.js
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/webapps/hdfs/explorer.js
@@ -192,13 +192,40 @@
var download_url = '/webhdfs/v1' + abs_path + '?op=OPEN';
$('#file-info-download').attr('href', download_url);
- $('#file-info-preview').click(function() {
+
+ var processPreview = function(url) {
+ url += "&noredirect=true";
+ $.ajax({
+ type: 'GET',
+ url: url,
+ processData: false,
+ crossDomain: true
+ }).done(function(data) {
+ url = data.Location;
+ $.ajax({
+ type: 'GET',
+ url: url,
+ processData: false,
+ crossDomain: true
+ }).complete(function(data) {
+ $('#file-info-preview-body').val(data.responseText);
+ $('#file-info-tail').show();
+ }).error(function(jqXHR, textStatus, errorThrown) {
+ show_err_msg("Couldn't preview the file. " + errorThrown);
+ });
+ }).error(function(jqXHR, textStatus, errorThrown) {
+ show_err_msg("Couldn't find datanode to read file from. " +
errorThrown);
+ });
+ }
+
+ $('#file-info-preview-tail').click(function() {
var offset = d.fileLength - TAIL_CHUNK_SIZE;
var url = offset > 0 ? download_url + '&offset=' + offset :
download_url;
- $.get(url, function(t) {
- $('#file-info-preview-body').val(t);
- $('#file-info-tail').show();
- }, "text").error(network_error_handler(url));
+ processPreview(url);
+ });
+ $('#file-info-preview-head').click(function() {
+ var url = d.fileLength > TAIL_CHUNK_SIZE ? download_url + '&length=' +
TAIL_CHUNK_SIZE : download_url;
+ processPreview(url);
});
if (d.fileLength > 0) {
{code}
> Bring back the feature to view chunks of files in the HDFS file browser
> -----------------------------------------------------------------------
>
> Key: HDFS-8678
> URL: https://issues.apache.org/jira/browse/HDFS-8678
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: ui
> Reporter: Ravi Prakash
> Assignee: Ravi Prakash
> Attachments: HDFS-8678.01.patch, HDFS-8678.02.patch
>
>
> The legacy file browser displayed small chunks of a file in the browser
> itself. This was useful to users because they can quickly verify that their
> input or output is in the format they expect. We should bring back this
> functionality.
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