Bug 1565119

Summary:	Rebalance on few nodes doesn't seem to complete - stuck at FUTEX_WAIT
Product:	[Red Hat Storage] Red Hat Gluster Storage	Reporter:	Prasad Desala <tdesala>
Component:	distribute	Assignee:	Nithya Balachandran <nbalacha>
Status:	CLOSED ERRATA	QA Contact:	Prasad Desala <tdesala>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	rhgs-3.4	CC:	rhinduja, rhs-bugs, storage-qa-internal
Target Milestone:	---
Target Release:	RHGS 3.4.0
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	glusterfs-3.12.2-9	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:
Clones:	1568348 (view as bug list)		Environment:
Last Closed:	2018-09-04 06:46:01 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:
Bug Blocks:	1503137, 1568348, 1570475, 1570476

Description Prasad Desala 2018-04-09 12:43:45 UTC

Description of problem:
=======================
With a data set having files and directories, on a 6 node setup triggered rebalance. Rebalance on 3 of 6 nodes completed in 7 minutes. On the other nodes rebalance is running for more than 5 hrs and is still running. 
Seems like rebalance process is not going to end. In rebalance logs I am not seeing any fix-layout changes or file migration messages and in rebalance status there is no change in the values of rebalance files, size, scanned, failures, skipped since 5hrs. 

I have left the system in the same state and can be used for live debugging.

Version-Release number of selected component (if applicable):
3.12.2-7.el7rhgs.x86_64

How reproducible:
Reporting at first occurrence

Steps to Reproduce:
===================
Not sure on the exact reproducer but below steps lead to this situation.
1) Create a x3 volume and start it.
2) FUSE mount on multiple clients
3) From mount point, create files and directories.
4) From one client start renaming the data set created in 3 and from other clients start lookups.
5) Now add-bricks and start rebalance with force option.
6) Wait till the rebalance completes.

Actual results:
===============
Rebalance on few nodes doesn't seem to complete .

Expected results:
=================
Rebalance should complete without any issues.

Comment 15 Prasad Desala 2018-07-10 10:19:53 UTC

Verified this BZ on glusterfs version: 3.12.2-13.el7rhgs.x86_64. Ran the tests mentioned in the description and Comment 9.

Did not see rebalance hang, moving this BZ to Verified state.

Comment 17 errata-xmlrpc 2018-09-04 06:46:01 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:2607