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Posted to issues@hive.apache.org by "Naveen Gangam (JIRA)" <ji...@apache.org> on 2018/06/04 15:41:00 UTC
[jira] [Comment Edited] (HIVE-19700) Workaround for JLine issue
with UnsupportedTerminal
[ https://issues.apache.org/jira/browse/HIVE-19700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16500338#comment-16500338 ]
Naveen Gangam edited comment on HIVE-19700 at 6/4/18 3:40 PM:
--------------------------------------------------------------
Fix has been pushed to the master (4.0), branch-3 (3.1) and branch-2 (2.4). Thanks for the review.
was (Author: ngangam):
Fix has been pushed to the master (4.0), branch-3 (3.1) and branch-2 (2.3.4). Thanks for the review.
> Workaround for JLine issue with UnsupportedTerminal
> ---------------------------------------------------
>
> Key: HIVE-19700
> URL: https://issues.apache.org/jira/browse/HIVE-19700
> Project: Hive
> Issue Type: Bug
> Reporter: Naveen Gangam
> Assignee: Naveen Gangam
> Priority: Major
> Fix For: 2.4.0, 3.1.0, 4.0.0
>
> Attachments: HIVE-19700.patch
>
>
> From the JLine's ConsoleReader, readLine(prompt, mask) calls the following beforeReadLine() method.
> {code}
> try {
> // System.out.println("is terminal supported " + terminal.isSupported());
> if (!terminal.isSupported()) {
> beforeReadLine(prompt, mask);
> }
> {code}
> So specifically when using UnsupportedTerminal {{-Djline.terminal}} and {{prompt=null}} and {{mask!=null}}, a "null" string gets printed to the console before and after the query result. {{UnsupportedTerminal}} is required to be used when running beeline as a background process, hangs otherwise.
> {code}
> private void beforeReadLine(final String prompt, final Character mask) {
> if (mask != null && maskThread == null) {
> final String fullPrompt = "\r" + prompt
> + " "
> + " "
> + " "
> + "\r" + prompt;
> maskThread = new Thread()
> {
> public void run() {
> while (!interrupted()) {
> try {
> Writer out = getOutput();
> out.write(fullPrompt);
> {code}
> So the {{prompt}} is null and {{mask}} is NOT in atleast 2 scenarios in beeline.
> when beeline's silent=true, prompt is null
> * https://github.com/apache/hive/blob/master/beeline/src/java/org/apache/hive/beeline/BeeLine.java#L1264
> when running multiline queries
> * https://github.com/apache/hive/blob/master/beeline/src/java/org/apache/hive/beeline/Commands.java#L1093
> When executing beeline in script mode (commands in a file), there should not be any masking while reading lines from the script file. aka, entire line should be a beeline command or part of a multiline hive query.
> So it should be safe to use a null mask instead of {{ConsoleReader.NULL_MASK}} when using UnsupportedTerminal as jline terminal.
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