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ITS#7165 back-mdb: check for stale readers on MDB_READERS_FULL

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retry opening a read txn if we cleared any stale readers
This commit is contained in:
Howard Chu 2022-05-13 16:32:41 +01:00 committed by Quanah Gibson-Mount
parent 26e3721359
commit 205e2f1a3e
1 changed files with 10 additions and 0 deletions
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10
servers/slapd/back-mdb/id2entry.c
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@ -779,7 +779,17 @@ mdb_opinfo_get( Operation *op, struct mdb_info *mdb, int rdonly, mdb_op_info **m
return rc;
}
if ( ldap_pvt_thread_pool_getkey( ctx, mdb->mi_dbenv, &data, NULL ) ) {
int retried = 0;
retry:
rc = mdb_txn_begin( mdb->mi_dbenv, NULL, MDB_RDONLY, &moi->moi_txn );
if (rc == MDB_READERS_FULL && !retried) {
int dead;
/* if any stale readers were cleared, a slot should be available */
if (!mdb_reader_check( mdb->mi_dbenv, &dead ) && dead) {
retried = 1;
goto retry;
}
}
if (rc) {
Debug( LDAP_DEBUG_ANY, "mdb_opinfo_get: err %s(%d)\n",
mdb_strerror(rc), rc );