Bug 1374286

Summary:	[geo-rep]: defunct tar process while using tar+ssh sync
Product:	[Community] GlusterFS	Reporter:	Aravinda VK <avishwan>
Component:	geo-replication	Assignee:	Aravinda VK <avishwan>
Status:	CLOSED CURRENTRELEASE	QA Contact:
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	mainline	CC:	amukherj, bugs, csaba, rhinduja, rhs-bugs, storage-qa-internal
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:	glusterfs-3.10.0	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:	1373976
Clones:	1375541 1375542 1375543 (view as bug list)		Environment:
Last Closed:	2017-03-06 17:25:17 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1373976
Bug Blocks:	1375541, 1375542, 1375543

Description Aravinda VK 2016-09-08 12:00:00 UTC

+++ This bug was initially created as a clone of Bug #1373976 +++

Description of problem:
=======================

While syncing data using tar, the sync completes but lots of tar process becomes defunct. 

[root@dhcp41-167 ~]# ps -eaf | grep tar
root     12520  4519  1 17:19 ?        00:00:00 tar --sparse -cf - --files-from -
root     12521  4522  1 17:19 ?        00:00:00 tar --sparse -cf - --files-from -
root     12522  4519  6 17:19 ?        00:00:00 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/tar_ssh.pem -p 22 root.41.203 tar --overwrite -xf - -C /proc/22664/cwd
root     12523  4522  6 17:19 ?        00:00:00 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/tar_ssh.pem -p 22 root.41.203 tar --overwrite -xf - -C /proc/22663/cwd
root     12524  4510  1 17:19 ?        00:00:00 tar --sparse -cf - --files-from -
root     12525  4510 10 17:19 ?        00:00:00 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/tar_ssh.pem -p 22 root.41.203 tar --overwrite -xf - -C /proc/22665/cwd
root     12526  4498  0 17:19 ?        00:00:00 tar --sparse -cf - --files-from -
root     12527  4498  0 17:19 ?        00:00:00 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/tar_ssh.pem -p 22 root.41.203 tar --overwrite -xf - -C /proc/22662/cwd
root     12529  4186  0 17:19 pts/0    00:00:00 grep tar
[root@dhcp41-167 ~]#
[root@dhcp41-167 ~]# ps -eaf | grep tar
root     12520  4519  1 17:19 ?        00:00:00 [tar] <defunct>
root     12521  4522  0 17:19 ?        00:00:00 tar --sparse -cf - --files-from -
root     12523  4522  5 17:19 ?        00:00:00 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/tar_ssh.pem -p 22 root.41.203 tar --overwrite -xf - -C /proc/22663/cwd
root     12524  4510  1 17:19 ?        00:00:00 tar --sparse -cf - --files-from -
root     12525  4510  7 17:19 ?        00:00:00 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/tar_ssh.pem -p 22 root.41.203 tar --overwrite -xf - -C /proc/22665/cwd
root     12526  4498  0 17:19 ?        00:00:00 tar --sparse -cf - --files-from -
root     12527  4498  1 17:19 ?        00:00:00 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/tar_ssh.pem -p 22 root.41.203 tar --overwrite -xf - -C /proc/22662/cwd
root     12531  4186  0 17:19 pts/0    00:00:00 grep tar
[root@dhcp41-167 ~]#
[root@dhcp41-167 ~]# ps -eaf | grep tar
root     12520  4519  0 17:19 ?        00:00:00 [tar] <defunct>
root     12521  4522  0 17:19 ?        00:00:00 [tar] <defunct>
root     12524  4510  0 17:19 ?        00:00:00 [tar] <defunct>
root     12526  4498  0 17:19 ?        00:00:00 [tar] <defunct>
root     12533  4186  0 17:19 pts/0    00:00:00 grep tar
[root@dhcp41-167 ~]#
[root@dhcp41-167 ~]# ps -eaf | grep tar
root     12520  4519  0 17:19 ?        00:00:00 [tar] <defunct>
root     12521  4522  0 17:19 ?        00:00:00 [tar] <defunct>
root     12524  4510  0 17:19 ?        00:00:00 [tar] <defunct>
root     12526  4498  0 17:19 ?        00:00:00 [tar] <defunct>
root     12543  4186  0 17:19 pts/0    00:00:00 grep tar
[root@dhcp41-167 ~]# 


Steps to Reproduce:
===================
1. Setup geo-rep between master and slave
2. Set config parameter use-tarssh true
3. Start geo-replication
4. Write some data on master volume 
5, Monitor tar process on master nodes using "ps -eaf | grep tar" 

Actual results:
===============

Data at master and slave is synced and arequal checksum matches, However, lots of process gets defunct. 
[root@dhcp41-167 ~]# ps -eaf | grep tar
root     12520  4519  0 17:19 ?        00:00:00 [tar] <defunct>
root     12521  4522  0 17:19 ?        00:00:00 [tar] <defunct>
root     12524  4510  0 17:19 ?        00:00:00 [tar] <defunct>
root     12526  4498  0 17:19 ?        00:00:00 [tar] <defunct>
root     12543  4186  0 17:19 pts/0    00:00:00 grep tar
[root@dhcp41-167 ~]# 


Expected results:
=================
No tar process should be defunct

Comment 1 Worker Ant 2016-09-08 12:02:46 UTC

REVIEW: http://review.gluster.org/15426 (geo-rep: Defunct tar process after sync) posted (#1) for review on master by Aravinda VK (avishwan)

Comment 2 Worker Ant 2016-09-08 16:13:22 UTC

REVIEW: http://review.gluster.org/15426 (geo-rep: Defunct tar process after sync) posted (#2) for review on master by Aravinda VK (avishwan)

Comment 3 Worker Ant 2016-09-13 10:59:31 UTC

COMMIT: http://review.gluster.org/15426 committed in master by Aravinda VK (avishwan) 
------
commit 6b30e9bf5a612e105eb7ded0a89ef25fd8530ba5
Author: Aravinda VK <avishwan>
Date:   Thu Sep 8 17:30:37 2016 +0530

    geo-rep: Defunct tar process after sync
    
    After every sync iteration with tarssh mode leaves defunct tar
    process.
    
    Added wait for tar process to prevent this issue.
    
    BUG: 1374286
    Change-Id: I9953239ef601cc1970c814b00074b45eb00f481e
    Signed-off-by: Aravinda VK <avishwan>
    Reviewed-on: http://review.gluster.org/15426
    Smoke: Gluster Build System <jenkins.org>
    NetBSD-regression: NetBSD Build System <jenkins.org>
    Reviewed-by: Saravanakumar Arumugam <sarumuga>
    CentOS-regression: Gluster Build System <jenkins.org>
    Reviewed-by: Kotresh HR <khiremat>

Comment 4 Shyamsundar 2017-03-06 17:25:17 UTC

This bug is getting closed because a release has been made available that should address the reported issue. In case the problem is still not fixed with glusterfs-3.10.0, please open a new bug report.

glusterfs-3.10.0 has been announced on the Gluster mailinglists [1], packages for several distributions should become available in the near future. Keep an eye on the Gluster Users mailinglist [2] and the update infrastructure for your distribution.

[1] http://lists.gluster.org/pipermail/gluster-users/2017-February/030119.html
[2] https://www.gluster.org/pipermail/gluster-users/