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/*-
* Copyright (c) 2014-2015 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
/*
* __wt_curstat_colgroup_init --
* Initialize the statistics for a column group.
*/
int
__wt_curstat_colgroup_init(WT_SESSION_IMPL *session,
const char *uri, const char *cfg[], WT_CURSOR_STAT *cst)
{
WT_COLGROUP *colgroup;
WT_DECL_ITEM(buf);
WT_DECL_RET;
WT_RET(__wt_schema_get_colgroup(session, uri, false, NULL, &colgroup));
WT_RET(__wt_scr_alloc(session, 0, &buf));
WT_ERR(__wt_buf_fmt(session, buf, "statistics:%s", colgroup->source));
ret = __wt_curstat_init(session, buf->data, cfg, cst);
err: __wt_scr_free(session, &buf);
return (ret);
}
/*
* __wt_curstat_index_init --
* Initialize the statistics for an index.
*/
int
__wt_curstat_index_init(WT_SESSION_IMPL *session,
const char *uri, const char *cfg[], WT_CURSOR_STAT *cst)
{
WT_DECL_ITEM(buf);
WT_DECL_RET;
WT_INDEX *idx;
WT_RET(__wt_schema_get_index(session, uri, false, NULL, &idx));
WT_RET(__wt_scr_alloc(session, 0, &buf));
WT_ERR(__wt_buf_fmt(session, buf, "statistics:%s", idx->source));
ret = __wt_curstat_init(session, buf->data, cfg, cst);
err: __wt_scr_free(session, &buf);
return (ret);
}
/*
* __curstat_size_only --
* For very simple tables we can avoid getting table handles if
* configured to only retrieve the size. It's worthwhile because
* workloads that create and drop a lot of tables can put a lot of
* pressure on the table list lock.
*/
static int
__curstat_size_only(WT_SESSION_IMPL *session,
const char *uri, bool *was_fast,WT_CURSOR_STAT *cst)
{
WT_CONFIG cparser;
WT_CONFIG_ITEM ckey, colconf, cval;
WT_DECL_RET;
WT_ITEM namebuf;
wt_off_t filesize;
char *tableconf;
WT_CLEAR(namebuf);
*was_fast = false;
/* Retrieve the metadata for this table. */
WT_RET(__wt_metadata_search(session, uri, &tableconf));
/*
* The fast path only works if the table consists of a single file
* and does not have any indexes. The absence of named columns is how
* we determine that neither of those conditions can be satisfied.
*/
WT_ERR(__wt_config_getones(session, tableconf, "columns", &colconf));
WT_ERR(__wt_config_subinit(session, &cparser, &colconf));
if ((ret = __wt_config_next(&cparser, &ckey, &cval)) == 0)
goto err;
/* Build up the file name from the table URI. */
WT_ERR(__wt_buf_fmt(
session, &namebuf, "%s.wt", uri + strlen("table:")));
/*
* Get the size of the underlying file. This will fail for anything
* other than simple tables (LSM for example) and will fail if there
* are concurrent schema level operations (for example drop). That is
* fine - failing here results in falling back to the slow path of
* opening the handle.
*/
WT_ERR(__wt_filesize_name(session, namebuf.data, true, &filesize));
/* Setup and populate the statistics structure */
__wt_stat_dsrc_init_single(&cst->u.dsrc_stats);
cst->u.dsrc_stats.block_size = filesize;
__wt_curstat_dsrc_final(cst);
*was_fast = true;
err: __wt_free(session, tableconf);
__wt_buf_free(session, &namebuf);
return (ret);
}
/*
* __wt_curstat_table_init --
* Initialize the statistics for a table.
*/
int
__wt_curstat_table_init(WT_SESSION_IMPL *session,
const char *uri, const char *cfg[], WT_CURSOR_STAT *cst)
{
WT_CURSOR *stat_cursor;
WT_DECL_ITEM(buf);
WT_DECL_RET;
WT_DSRC_STATS *new, *stats;
WT_TABLE *table;
u_int i;
const char *name;
bool was_fast;
/*
* If only gathering table size statistics, try a fast path that
* avoids the schema and table list locks.
*/
if (F_ISSET(cst, WT_CONN_STAT_SIZE)) {
WT_RET(__curstat_size_only(session, uri, &was_fast, cst));
if (was_fast)
return (0);
}
name = uri + strlen("table:");
WT_RET(__wt_schema_get_table(
session, name, strlen(name), false, &table));
WT_ERR(__wt_scr_alloc(session, 0, &buf));
/*
* Process the column groups.
*
* Set the cursor to reference the data source statistics; we don't
* initialize it, instead we copy (rather than aggregate), the first
* column's statistics, which has the same effect.
*/
stats = &cst->u.dsrc_stats;
for (i = 0; i < WT_COLGROUPS(table); i++) {
WT_ERR(__wt_buf_fmt(
session, buf, "statistics:%s", table->cgroups[i]->name));
WT_ERR(__wt_curstat_open(
session, buf->data, cfg, &stat_cursor));
new = (WT_DSRC_STATS *)WT_CURSOR_STATS(stat_cursor);
if (i == 0)
*stats = *new;
else
__wt_stat_dsrc_aggregate_single(new, stats);
WT_ERR(stat_cursor->close(stat_cursor));
}
/* Process the indices. */
WT_ERR(__wt_schema_open_indices(session, table));
for (i = 0; i < table->nindices; i++) {
WT_ERR(__wt_buf_fmt(
session, buf, "statistics:%s", table->indices[i]->name));
WT_ERR(__wt_curstat_open(
session, buf->data, cfg, &stat_cursor));
new = (WT_DSRC_STATS *)WT_CURSOR_STATS(stat_cursor);
__wt_stat_dsrc_aggregate_single(new, stats);
WT_ERR(stat_cursor->close(stat_cursor));
}
__wt_curstat_dsrc_final(cst);
err: __wt_schema_release_table(session, table);
__wt_scr_free(session, &buf);
return (ret);
}
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