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From 8355b844dbc7097ddc5639a1da0932c60ca50aee Mon Sep 17 00:00:00 2001
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From: Mark Reynolds <mreynolds@redhat.com>
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Date: Wed, 16 Oct 2019 20:27:30 -0400
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Subject: [PATCH] Issue 49850 - ldbm_get_nonleaf_ids() slow for databases with
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many non-leaf entries
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Bug Description: The logs from an LDIF import indicated that gathering non-leaf IDs
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for creating the ancestorid index took an enormous amount of time,
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over 10hrs. The root cause is that the parentid index btree ordering
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is lexical, but the IDList being built up from it is sorted numerically.
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In the existing code, the IDList is maintained in constantly sorted
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order by idl_insert().
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Fix Description: ldbm_get_nonleaf_ids() switches to idl_append_extend() instead idl_insert()
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for building up the IDList and then sorts the result only once, using
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qsort with idl_sort_cmp, after the entire list has been gathered.
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The improvement on identical hardware is for the operation to take 10
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seconds rather than 10 hours
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Patch Author: Thomas Lackey <telackey@bozemanpass.com> Thanks for the great contribution!!!
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relates: https://pagure.io/389-ds-base/issue/49850
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Reviewed by: mreynolds, tbordaz, and firstyear
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---
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ldap/servers/slapd/back-ldbm/ancestorid.c | 20 +++++++++++++++++++-
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1 file changed, 19 insertions(+), 1 deletion(-)
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diff --git a/ldap/servers/slapd/back-ldbm/ancestorid.c b/ldap/servers/slapd/back-ldbm/ancestorid.c
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index 24642923d..254a3aa3b 100644
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--- a/ldap/servers/slapd/back-ldbm/ancestorid.c
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+++ b/ldap/servers/slapd/back-ldbm/ancestorid.c
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@@ -82,7 +82,14 @@ ldbm_get_nonleaf_ids(backend *be, DB_TXN *txn, IDList **idl, ImportJob *job)
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ret = dbc->c_get(dbc, &key, &data, DB_NEXT_NODUP);
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if ((ret == 0) && (*(char *)key.data == EQ_PREFIX)) {
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id = (ID)strtoul((char *)key.data + 1, NULL, 10);
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- idl_insert(&nodes, id);
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+ /*
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+ * TEL 20180711 - switch to idl_append instead of idl_insert because there is no
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+ * no need to keep the list constantly sorted, which can be very expensive with
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+ * large databases (exacerbated by the fact that the parentid btree ordering is
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+ * lexical, but the idl_insert ordering is numeric). It is enough to gather them
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+ * all together and sort them once at the end.
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+ */
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+ idl_append_extend(&nodes, id);
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}
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key_count++;
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if (!(key_count % PROGRESS_INTERVAL)) {
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@@ -107,6 +114,17 @@ ldbm_get_nonleaf_ids(backend *be, DB_TXN *txn, IDList **idl, ImportJob *job)
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if (ret != 0)
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ldbm_nasty("ldbm_get_nonleaf_ids", sourcefile, 13030, ret);
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+ if (ret == 0) {
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+ /* now sort it */
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+ import_log_notice(job, SLAPI_LOG_INFO, "ldbm_get_nonleaf_ids",
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+ "Starting sort of ancestorid non-leaf IDs...");
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+
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+ qsort((void *)&nodes->b_ids[0], nodes->b_nids, (size_t)sizeof(ID), idl_sort_cmp);
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+
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+ import_log_notice(job, SLAPI_LOG_INFO, "ldbm_get_nonleaf_ids",
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+ "Finished sort of ancestorid non-leaf IDs.");
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+ }
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+
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out:
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/* Close the cursor */
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if (dbc != NULL) {
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--
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2.21.0
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