Jean-Charles ROGEZ jean-charles.rogez@csnovidys.com schrieb am 24.03.2021
um 15:06 in Nachricht PR2P264MB0911634B6ED936442371A372D1639@PR2P264MB0911.FRAP264.PROD.OUTLOOK.COM:
Hello,
We use OpenLDAP 2.4.57 under RHEL8 with a configuration with 2 directories in MM and 2 replicas. We only write on one of the masters. The size of the LMDB database grows following writes of members of large groups (2000 members) by a batch which runs every 10 minutes.
Does that mean you re-write your 2000 members every 10 minutes, or do just just update (add or drop a few) the members?
The base grows regularly and sometimes undergoes significant jumps until it
reaches its maximum size. The lmdb_stat ‑ef command indicates that very few pages are used and everything else is free pages. The used pages are stable.
[cid:image001.jpg@01D720BD.58844450]
And yet, it is no longer possible to write in the directory. Sometimes it's
on the master directory, sometimes on replicas where syncrepl fails.
2021‑03‑24T11: 52: 59.978157 + 01: 00 int‑ohz‑infra1 slapd debug local4
25076 ‑
mdb_id2entry_put: mdb_put failed: MDB_MAP_FULL: Environment mapsize limit reached (‑30792) "uid = us‑00000301, ou = users, dc = bst, dc = ocn, dc = infra, dc = ftgroup " 2021‑03‑24T11: 52: 59.978184 + 01: 00 int‑ohz‑infra1 slapd debug local4
25076 ‑
syncrepl_null_callback: error code 0x50 2021‑03‑24T11: 52: 59.978202 + 01: 00 int‑ohz‑infra1 slapd debug local4
25076 ‑
syncrepl_entry: rid = 001 be_modify failed (80) 2021‑03‑24T11: 52: 59.978780 + 01: 00 int‑ohz‑infra1 slapd debug local4
25076 ‑
do_syncrepl: rid = 001 rc 80 retrying
There is no transaction in progress: mdb_stat ‑r /var/lib/ldap/data/ Reader Table Status pid thread txnid 25076 7fa0e42c5480 ‑ 25076 7fa0977fe700 ‑ 25076 7fa097fff700 ‑ 25076 7fa094cfa700 ‑ 25076 7fa086ffe700 ‑ 25076 7fa0857fb700 ‑ 25076 7fa0867fd700 ‑ 25076 7fa085ffc700 ‑ 25076 7fa074ffc700 ‑
The batch executes a lot of transactions < 2s. Restarting slapd does not resolve the problem. If we compact the database with mdb_copy ‑c, it only makes a few MB and it works again. The problem no longer appears without large groups.
Why are free pages not used? Wouldn't there be a problem with writing many multi‑valued attributes?
Thank you for your help !
Jean‑Charles Rogez [https://marketing.csnovidys.com/Logos/banniere_mail.png]
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Jean‑Charles ROGEZ
Architecte Système | INTEGRATION SYSTEMES | PLESSIS Standard : +33180848010tel:+33180848010 Ligne directe : tel:r Mobile : tel: Email : jean‑charles.rogez@csnovidys.commailto:jean‑charles.rogez@csnovidys.com