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Bug 1790981 - Entry cache contention during base search
Summary: Entry cache contention during base search
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: 389-ds-base
Version: 8.2
Hardware: x86_64
OS: Linux
high
high
Target Milestone: rc
: 8.0
Assignee: mreynolds
QA Contact: RHDS QE
URL:
Whiteboard:
Depends On: 1724761
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-01-14 16:04 UTC by mreynolds
Modified: 2023-09-07 21:27 UTC (History)
18 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1724761
Environment:
Last Closed: 2020-04-28 16:01:40 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-32302 0 None None None 2023-03-26 08:52:37 UTC
Red Hat Product Errata RHBA-2020:1703 0 None None None 2020-04-28 16:01:49 UTC

Comment 2 Viktor Ashirov 2020-02-25 14:32:52 UTC 
Build tested: 389-ds-base-1.4.2.4-7.module+el8.2.0+5670+0b8b1c2e.x86_64

To reproduce I used a group with 5000 members.
Then I ran in a loop parallel searches using ldapsearch with deref control:

ldapsearch -D 'cn=directory manager' -w password -b cn=admins,ou=groups,dc=example,dc=com -LLL -x -h localhost:38901 -o ldif-wrap=no '(objectClass=*)' -E 'deref=member:cn,userpassword'

I ran systemtap script from bz1724761 for tracing. 

On 389-ds-base-1.4.1.3-7.module+el8.1.0+4150+5b8c2c1f.x86_64 I was seeing 

slapi_search_internal_pb: 15148877 of 16082067 [ 94.1973 %]
             ldbm_back_next_search_entry: 8226970 of 16082067 [ 51.1562 %]
                 cache_lock: 6318050 of 16082067 [ 39.2863 %]
                 cache_unlock: 196772 of 16082067 [ 1.22355 %]

But after upgrade to 389-ds-base-1.4.2.4-7.module+el8.2.0+5670+0b8b1c2e.x86_64:

slapi_search_internal_pb: 12052261 of 12559235 [ 95.9633 %]
             ldbm_back_next_search_entry: 1466450 of 12559235 [ 11.6763 %]

There is no longer an entry cache lock contention, marking as VERIFIED.
Comment 4 errata-xmlrpc 2020-04-28 16:01:40 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/RHBA-2020:1703
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