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Bug 1694846 - long file cat seems to hang playback in the browser
Summary: long file cat seems to hang playback in the browser
Keywords:
Status: CLOSED DUPLICATE of bug 1793594
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: cockpit-session-recording
Version: 8.0
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: 8.0
Assignee: jstephen
QA Contact: Ondrej Moriš
URL:
Whiteboard:
Depends On: 1751783
Blocks:
TreeView+ depends on / blocked
 
Reported: 2019-04-01 20:24 UTC by Scott Poore
Modified: 2020-05-26 18:31 UTC (History)
1 user (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-05-26 18:31:11 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
journal export (10.29 MB, text/plain)
2019-04-01 20:28 UTC, Scott Poore 		no flags Details
View All

Description Scott Poore 2019-04-01 20:24:44 UTC 
Description of problem:

If I cat a long file in a recorded session, playback hangs the browser tab.

Attempted in both Chrome and Firefox with the same results.  

Version-Release number of selected component (if applicable):
cockpit-session-recording-1-29.el8.noarch

How reproducible:
Unknown.

Steps to Reproduce:
1.  Install tlog and cockpit-session-recording
2.  Configure SSSD to enable session recording for all users
3.  login as local user and cat /usr/share/dict/linux.words
5.  exit
6.  Login to cockpit and select session from under Session Recording
7.  click play icon


Actual results:
playback hangs and I see an error about a web page slowing down the brower.


Expected results:

playback full ouput as normal.


Additional info:
Comment 1 Scott Poore 2019-04-01 20:25:33 UTC 
FYI, this seems to affect other cases where there's a lot of output fast such as:

find /
Comment 2 Scott Poore 2019-04-01 20:28:57 UTC 
Created attachment 1550743 [details]
journal export

Generated this journal export with:

journalctl -xel _EXE=/usr/bin/tlog-rec-session --since 14:55:20 --until 14:55:40 --lines=all -o export > /tmp/tlog-long_file_cat.export

You should be able to test with import like:

cat  /tmp/tlog-long_file_cat.export | /usr/lib/systemd/systemd-journal-remote -o /var/log/journal/remote/remote-192.168.122.80.journal -
Comment 3 Kirill Gliebov 2019-04-03 07:46:06 UTC 
I just tested this on my side and I am definitely confirming the problem. 
My first idea about how to fix this is to replace old term.js with xterm.js. I already tried this and it worked faster without hanging browser, but resizing feature might be compromised in case of such replacement. Nevertheless, I believe this will be a right way to do, since Cockpit migrate to xterm.js already.
Comment 4 Kirill Gliebov 2019-04-03 07:49:20 UTC 
One more thing. So for xterm test I used session recording on my host, but doing the same - cat /usr/share/dict/linux.words.
But xterm solution with xterm has no effect on the attached session in BZ. Could it be somehow related to some of the tlog params? It is definitely problem of cockpit-session-recording, but just would like to know.
Comment 5 Scott Poore 2019-05-09 19:09:50 UTC 
No idea.  I could re-test on my system if you can create a scratch build with xterm.js.  See if it's still reproducible.
Comment 7 jstephen 2019-08-21 15:27:42 UTC 
This is easily reproducible with any recording containing commands like 'find /' or 'cat /usr/share/dict/linux.words'

I replaced term.js with xterm.js upstream as we want to use the maintained xtermjs component anyway. However, it alleviates the problem described in this BZ only slightly. The playback no longer immediately hangs the page, however...
  
   1. The player page does still eventually hang
   2. Playback often produces slow, poor latency output
   3. Playback hangs and does not reproduce all logged output when the cockpit journal.journalctl method does not stream all entries to our calling code

For item #1 and #2, I will need to investigate these problems as performance issues more closely.

I created a ticket with the cockpit team for item #3, we are retrieving journal entries from the cockpit journal API: https://github.com/cockpit-project/cockpit/issues/12580
Comment 8 jstephen 2019-09-12 15:01:33 UTC 
The performance issues with the player page itself have been fixed upstream:

   - https://github.com/Scribery/cockpit-session-recording/commit/7c1585844479a0218987a32f7094495649461d11
   - https://github.com/Scribery/cockpit-session-recording/commit/feed483646e2e1cfc1d3d123f842729832ccb56f
   - https://github.com/Scribery/cockpit-session-recording/commit/811b80fa279fbfe2bea697f8772d6b8160d998cc

We are just waiting on the cockpit BZ https://bugzilla.redhat.com/show_bug.cgi?id=1751783 to completely close out this problem.
Comment 10 Ondrej Moriš 2020-05-05 12:22:29 UTC 
Is this really still broken in cockpit-session-recording-3-1.el8, cockpit-211.3-1.el8? It looks like I cannot reproduce it anymore.
Comment 11 jstephen 2020-05-06 17:13:14 UTC 
In my testing, a command like 'find /' is still not playing back the complete output. We made some changes to alleviate this issue on our side, but the fix on the cockpit side(1751783) is blocking us from completely resolving this problem.
Comment 12 jstephen 2020-05-26 18:31:11 UTC 
This was fixed by the cockpit team in https://bugzilla.redhat.com/show_bug.cgi?id=1751783

*** This bug has been marked as a duplicate of bug 1793594 ***
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