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From f05f5f20a468efa82d13a99687ac5d3a5d80a3c9 Mon Sep 17 00:00:00 2001
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From: tbordaz <tbordaz@redhat.com>
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Date: Tue, 23 Feb 2021 13:42:31 +0100
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Subject: [PATCH] Issue 4644 - Large updates can reset the CLcache to the
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beginning of the changelog (#4647)
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Bug description:
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The replication agreements are using bulk load to load updates.
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For bulk load it uses a cursor with DB_MULTIPLE_KEY and DB_NEXT.
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Before using the cursor, it must be initialized with DB_SET.
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If during the cursor/DB_SET the CSN refers to an update that is larger than
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the size of the provided buffer, then the cursor remains not initialized and
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c_get returns DB_BUFFER_SMALL.
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The consequence is that the next c_get(DB_MULTIPLE_KEY and DB_NEXT) will return the
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first record in the changelog DB. This break CLcache.
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Fix description:
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The fix is to harden cursor initialization so that if DB_SET fails
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because of DB_BUFFER_SMALL. It reallocates buf_data and retries a DB_SET.
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If DB_SET can not be initialized it logs a warning.
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The patch also changes the behaviour of the fix #4492.
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#4492 detected a massive (1day) jump prior the starting csn and ended the
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replication session. If the jump was systematic, for example
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if the CLcache got broken because of a too large updates, then
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replication was systematically stopped.
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36233f |
This patch suppress the systematically stop, letting RA doing a big jump.
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From #4492 only remains the warning.
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relates: https://github.com/389ds/389-ds-base/issues/4644
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Reviewed by: Pierre Rogier (Thanks !!!!)
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Platforms tested: F31
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---
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.../servers/plugins/replication/cl5_clcache.c | 68 +++++++++++++++----
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1 file changed, 53 insertions(+), 15 deletions(-)
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diff --git a/ldap/servers/plugins/replication/cl5_clcache.c b/ldap/servers/plugins/replication/cl5_clcache.c
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index fcbca047a..90dec4d54 100644
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--- a/ldap/servers/plugins/replication/cl5_clcache.c
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+++ b/ldap/servers/plugins/replication/cl5_clcache.c
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@@ -370,9 +370,7 @@ clcache_load_buffer(CLC_Buffer *buf, CSN **anchorCSN, int *continue_on_miss, cha
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}
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csn_as_string(buf->buf_current_csn, 0, curr);
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slapi_log_err(loglevel, buf->buf_agmt_name,
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- "clcache_load_buffer - bulk load cursor (%s) is lower than starting csn %s. Ending session.\n", curr, initial_starting_csn);
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- /* it just end the session with UPDATE_NO_MORE_UPDATES */
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- rc = CLC_STATE_DONE;
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+ "clcache_load_buffer - bulk load cursor (%s) is lower than starting csn %s.\n", curr, initial_starting_csn);
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}
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}
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@@ -413,10 +411,7 @@ clcache_load_buffer(CLC_Buffer *buf, CSN **anchorCSN, int *continue_on_miss, cha
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}
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csn_as_string(buf->buf_current_csn, 0, curr);
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slapi_log_err(loglevel, buf->buf_agmt_name,
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- "clcache_load_buffer - (DB_SET_RANGE) bulk load cursor (%s) is lower than starting csn %s. Ending session.\n", curr, initial_starting_csn);
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- rc = DB_NOTFOUND;
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-
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- return rc;
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+ "clcache_load_buffer - (DB_SET_RANGE) bulk load cursor (%s) is lower than starting csn %s.\n", curr, initial_starting_csn);
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}
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}
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}
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@@ -444,6 +439,42 @@ clcache_load_buffer(CLC_Buffer *buf, CSN **anchorCSN, int *continue_on_miss, cha
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return rc;
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}
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+/* Set a cursor to a specific key (buf->buf_key)
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+ * In case buf_data is too small to receive the value, DB_SET fails
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+ * (DB_BUFFER_SMALL). This let the cursor uninitialized that is
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+ * problematic because further cursor DB_NEXT will reset the cursor
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+ * to the beginning of the CL.
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+ * If buf_data is too small, this function reallocates enough space
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+ *
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+ * It returns the return code of cursor->c_get
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+ */
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+static int
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+clcache_cursor_set(DBC *cursor, CLC_Buffer *buf)
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+{
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+ int rc;
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+ uint32_t ulen;
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+ uint32_t dlen;
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+ uint32_t size;
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+
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+ rc = cursor->c_get(cursor, &buf->buf_key, &buf->buf_data, DB_SET);
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+ if (rc == DB_BUFFER_SMALL) {
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+ uint32_t ulen;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ /* Fortunately, buf->buf_data.size has been set by
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * c_get() to the actual data size needed. So we can
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * reallocate the data buffer and try to set again.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ ulen = buf->buf_data.ulen;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ buf->buf_data.ulen = (buf->buf_data.size / DEFAULT_CLC_BUFFER_PAGE_SIZE + 1) * DEFAULT_CLC_BUFFER_PAGE_SIZE;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ buf->buf_data.data = slapi_ch_realloc(buf->buf_data.data, buf->buf_data.ulen);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ slapi_log_err(SLAPI_LOG_REPL, buf->buf_agmt_name,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ "clcache_cursor_set - buf data len reallocated %d -> %d bytes (DB_BUFFER_SMALL)\n",
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ ulen, buf->buf_data.ulen);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ rc = cursor->c_get(cursor, &buf->buf_key, &buf->buf_data, DB_SET);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ return rc;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
static int
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
clcache_load_buffer_bulk(CLC_Buffer *buf, int flag)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
{
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
@@ -478,17 +509,24 @@ retry:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
if (use_flag == DB_NEXT) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
/* For bulk read, position the cursor before read the next block */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
- rc = cursor->c_get(cursor,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
- &buf->buf_key,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
- &buf->buf_data,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
- DB_SET);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ rc = clcache_cursor_set(cursor, buf);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
- /*
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
- * Continue if the error is no-mem since we don't need to
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
- * load in the key record anyway with DB_SET.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
- */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
if (0 == rc || DB_BUFFER_SMALL == rc) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ /*
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * It should not have failed with DB_BUFFER_SMALL as we tried
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * to adjust buf_data in clcache_cursor_set.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * But if it failed with DB_BUFFER_SMALL, there is a risk in clcache_cursor_get
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * that the cursor will be reset to the beginning of the changelog.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * Returning an error at this point will stop replication that is
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * a risk. So just accept the risk of a reset to the beginning of the CL
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ * and log an alarming message.
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ */
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ if (rc == DB_BUFFER_SMALL) {
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ slapi_log_err(SLAPI_LOG_WARNING, buf->buf_agmt_name,
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ "clcache_load_buffer_bulk - Fail to position on csn=%s from the changelog (too large update ?). Risk of full CL evaluation.\n",
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ (char *)buf->buf_key.data);
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
rc = clcache_cursor_get(cursor, buf, use_flag);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
--
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
2.31.1
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
36233f |
|