Example #1
0
/*
 * __curlog_close --
 *	WT_CURSOR.close method for the log cursor type.
 */
static int
__curlog_close(WT_CURSOR *cursor)
{
	WT_CONNECTION_IMPL *conn;
	WT_CURSOR_LOG *cl;
	WT_DECL_RET;
	WT_SESSION_IMPL *session;

	cl = (WT_CURSOR_LOG *)cursor;
	CURSOR_API_CALL_PREPARE_ALLOWED(cursor, session, close, NULL);
err:

	conn = S2C(session);
	if (F_ISSET(cl, WT_CURLOG_ARCHIVE_LOCK)) {
		(void)__wt_atomic_sub32(&conn->log_cursors, 1);
		__wt_readunlock(session, &conn->log->log_archive_lock);
	}

	__wt_free(session, cl->cur_lsn);
	__wt_free(session, cl->next_lsn);
	__wt_scr_free(session, &cl->logrec);
	__wt_scr_free(session, &cl->opkey);
	__wt_scr_free(session, &cl->opvalue);
	__wt_free(session, cl->packed_key);
	__wt_free(session, cl->packed_value);

	__wt_cursor_close(cursor);

	API_END_RET(session, ret);
}
Example #2
0
/*
 * __lsm_unpin_chunks --
 *	Decrement the reference count for a set of chunks. Allowing those
 *	chunks to be considered for deletion.
 */
static void
__lsm_unpin_chunks(WT_SESSION_IMPL *session, WT_LSM_WORKER_COOKIE *cookie)
{
	u_int i;

	for (i = 0; i < cookie->nchunks; i++) {
		if (cookie->chunk_array[i] == NULL)
			continue;
		WT_ASSERT(session, cookie->chunk_array[i]->refcnt > 0);
		(void)__wt_atomic_sub32(&cookie->chunk_array[i]->refcnt, 1);
	}
	/* Ensure subsequent calls don't double decrement. */
	cookie->nchunks = 0;
}
Example #3
0
/*
 * __lsm_worker_general_op --
 *	Execute a single bloom, drop or flush work unit.
 */
static int
__lsm_worker_general_op(
    WT_SESSION_IMPL *session, WT_LSM_WORKER_ARGS *cookie, bool *completed)
{
	WT_DECL_RET;
	WT_LSM_CHUNK *chunk;
	WT_LSM_WORK_UNIT *entry;
	bool force;

	*completed = false;
	/*
	 * Return if this thread cannot process a bloom, drop or flush.
	 */
	if (!FLD_ISSET(cookie->type,
	    WT_LSM_WORK_BLOOM | WT_LSM_WORK_DROP | WT_LSM_WORK_FLUSH))
		return (WT_NOTFOUND);

	if ((ret = __wt_lsm_manager_pop_entry(session,
	    cookie->type, &entry)) != 0 || entry == NULL)
		return (ret);

	if (entry->type == WT_LSM_WORK_FLUSH) {
		force = F_ISSET(entry, WT_LSM_WORK_FORCE);
		F_CLR(entry, WT_LSM_WORK_FORCE);
		WT_ERR(__wt_lsm_get_chunk_to_flush(session,
		    entry->lsm_tree, force, &chunk));
		/*
		 * If we got a chunk to flush, checkpoint it.
		 */
		if (chunk != NULL) {
			WT_ERR(__wt_verbose(session, WT_VERB_LSM,
			    "Flush%s chunk %d %s",
			    force ? " w/ force" : "",
			    chunk->id, chunk->uri));
			ret = __wt_lsm_checkpoint_chunk(
			    session, entry->lsm_tree, chunk);
			WT_ASSERT(session, chunk->refcnt > 0);
			(void)__wt_atomic_sub32(&chunk->refcnt, 1);
			WT_ERR(ret);
		}
	} else if (entry->type == WT_LSM_WORK_DROP)
		WT_ERR(__wt_lsm_free_chunks(session, entry->lsm_tree));
	else if (entry->type == WT_LSM_WORK_BLOOM)
		WT_ERR(__wt_lsm_work_bloom(session, entry->lsm_tree));
	*completed = true;

err:	__wt_lsm_manager_free_work_unit(session, entry);
	return (ret);
}
Example #4
0
/*
 * __wt_close --
 *	Close a file handle.
 */
int
__wt_close(WT_SESSION_IMPL *session, WT_FH **fhp)
{
	WT_CONNECTION_IMPL *conn;
	WT_DECL_RET;
	WT_FH *fh;
	uint64_t bucket;

	conn = S2C(session);

	if (*fhp == NULL)
		return (0);
	fh = *fhp;
	*fhp = NULL;

	__wt_spin_lock(session, &conn->fh_lock);
	if (fh == NULL || fh->ref == 0 || --fh->ref > 0) {
		__wt_spin_unlock(session, &conn->fh_lock);
		return (0);
	}

	/* Remove from the list. */
	bucket = fh->name_hash % WT_HASH_ARRAY_SIZE;
	WT_CONN_FILE_REMOVE(conn, fh, bucket);
	(void)__wt_atomic_sub32(&conn->open_file_count, 1);

	__wt_spin_unlock(session, &conn->fh_lock);

	/* Discard the memory.
	 * Note: For directories, we do not open valid directory handles on
	 * windows since it is not possible to sync a directory
	 */
	if (fh->filehandle != INVALID_HANDLE_VALUE &&
	    CloseHandle(fh->filehandle) == 0) {
		ret = __wt_errno();
		__wt_err(session, ret, "CloseHandle: %s", fh->name);
	}

	if (fh->filehandle_secondary != INVALID_HANDLE_VALUE &&
	    CloseHandle(fh->filehandle_secondary) == 0) {
		ret = __wt_errno();
		__wt_err(session, ret, "CloseHandle: secondary: %s", fh->name);
	}

	__wt_free(session, fh->name);
	__wt_free(session, fh);
	return (ret);
}
Example #5
0
/*
 * __wt_close --
 *	Close a file handle.
 */
int
__wt_close(WT_SESSION_IMPL *session, WT_FH **fhp)
{
    WT_CONNECTION_IMPL *conn;
    WT_DECL_RET;
    WT_FH *fh;
    uint64_t bucket;

    conn = S2C(session);

    if (*fhp == NULL)
        return (0);
    fh = *fhp;
    *fhp = NULL;

    /* Track handle-close as a file operation, so open and close match. */
    WT_RET(__wt_verbose(
               session, WT_VERB_FILEOPS, "%s: handle-close", fh->name));

    /*
     * If the reference count hasn't gone to 0, or if it's an in-memory
     * object, we're done.
     *
     * Assert the reference count is correct, but don't let it wrap.
     */
    __wt_spin_lock(session, &conn->fh_lock);
    WT_ASSERT(session, fh->ref > 0);
    if ((fh->ref > 0 && --fh->ref > 0) || F_ISSET(fh, WT_FH_IN_MEMORY)) {
        __wt_spin_unlock(session, &conn->fh_lock);
        return (0);
    }

    /* Remove from the list. */
    bucket = fh->name_hash % WT_HASH_ARRAY_SIZE;
    WT_CONN_FILE_REMOVE(conn, fh, bucket);
    (void)__wt_atomic_sub32(&conn->open_file_count, 1);

    __wt_spin_unlock(session, &conn->fh_lock);

    /* Discard underlying resources. */
    ret = fh->fh_close(session, fh);

    __wt_free(session, fh->name);
    __wt_free(session, fh);

    return (ret);
}
Example #6
0
/*
 * __wt_lsm_merge --
 *	Merge a set of chunks of an LSM tree.
 */
int
__wt_lsm_merge(WT_SESSION_IMPL *session, WT_LSM_TREE *lsm_tree, u_int id)
{
	WT_BLOOM *bloom;
	WT_CURSOR *dest, *src;
	WT_DECL_RET;
	WT_ITEM key, value;
	WT_LSM_CHUNK *chunk;
	uint32_t generation;
	uint64_t insert_count, record_count;
	u_int dest_id, end_chunk, i, nchunks, start_chunk, start_id, verb;
	int tret;
	bool created_chunk, create_bloom, locked, in_sync;
	const char *cfg[3];
	const char *drop_cfg[] =
	    { WT_CONFIG_BASE(session, WT_SESSION_drop), "force", NULL };

	bloom = NULL;
	chunk = NULL;
	dest = src = NULL;
	start_id = 0;
	created_chunk = create_bloom = locked = in_sync = false;

	/* Fast path if it's obvious no merges could be done. */
	if (lsm_tree->nchunks < lsm_tree->merge_min &&
	    lsm_tree->merge_aggressiveness < WT_LSM_AGGRESSIVE_THRESHOLD)
		return (WT_NOTFOUND);

	/*
	 * Use the lsm_tree lock to read the chunks (so no switches occur), but
	 * avoid holding it while the merge is in progress: that may take a
	 * long time.
	 */
	WT_RET(__wt_lsm_tree_writelock(session, lsm_tree));
	locked = true;

	WT_ERR(__lsm_merge_span(session,
	    lsm_tree, id, &start_chunk, &end_chunk, &record_count));
	nchunks = (end_chunk + 1) - start_chunk;

	WT_ASSERT(session, nchunks > 0);
	start_id = lsm_tree->chunk[start_chunk]->id;

	/* Find the merge generation. */
	for (generation = 0, i = 0; i < nchunks; i++)
		generation = WT_MAX(generation,
		    lsm_tree->chunk[start_chunk + i]->generation + 1);

	WT_ERR(__wt_lsm_tree_writeunlock(session, lsm_tree));
	locked = false;

	/* Allocate an ID for the merge. */
	dest_id = __wt_atomic_add32(&lsm_tree->last, 1);

	/*
	 * We only want to do the chunk loop if we're running with verbose,
	 * so we wrap these statements in the conditional.  Avoid the loop
	 * in the normal path.
	 */
	if (WT_VERBOSE_ISSET(session, WT_VERB_LSM)) {
		WT_ERR(__wt_verbose(session, WT_VERB_LSM,
		    "Merging %s chunks %u-%u into %u (%" PRIu64 " records)"
		    ", generation %" PRIu32,
		    lsm_tree->name,
		    start_chunk, end_chunk, dest_id, record_count, generation));
		for (verb = start_chunk; verb <= end_chunk; verb++)
			WT_ERR(__wt_verbose(session, WT_VERB_LSM,
			    "Merging %s: Chunk[%u] id %u, gen: %" PRIu32
			    ", size: %" PRIu64 ", records: %" PRIu64,
			    lsm_tree->name, verb, lsm_tree->chunk[verb]->id,
			    lsm_tree->chunk[verb]->generation,
			    lsm_tree->chunk[verb]->size,
			    lsm_tree->chunk[verb]->count));
	}

	WT_ERR(__wt_calloc_one(session, &chunk));
	created_chunk = true;
	chunk->id = dest_id;

	if (FLD_ISSET(lsm_tree->bloom, WT_LSM_BLOOM_MERGED) &&
	    (FLD_ISSET(lsm_tree->bloom, WT_LSM_BLOOM_OLDEST) ||
	    start_chunk > 0) && record_count > 0)
		create_bloom = true;

	/*
	 * Special setup for the merge cursor:
	 * first, reset to open the dependent cursors;
	 * then restrict the cursor to a specific number of chunks;
	 * then set MERGE so the cursor doesn't track updates to the tree.
	 */
	WT_ERR(__wt_open_cursor(session, lsm_tree->name, NULL, NULL, &src));
	F_SET(src, WT_CURSTD_RAW);
	WT_ERR(__wt_clsm_init_merge(src, start_chunk, start_id, nchunks));

	WT_WITH_SCHEMA_LOCK(session,
	    ret = __wt_lsm_tree_setup_chunk(session, lsm_tree, chunk));
	WT_ERR(ret);
	if (create_bloom) {
		WT_ERR(__wt_lsm_tree_setup_bloom(session, lsm_tree, chunk));

		WT_ERR(__wt_bloom_create(session, chunk->bloom_uri,
		    lsm_tree->bloom_config,
		    record_count, lsm_tree->bloom_bit_count,
		    lsm_tree->bloom_hash_count, &bloom));
	}

	/* Discard pages we read as soon as we're done with them. */
	F_SET(session, WT_SESSION_NO_CACHE);

	cfg[0] = WT_CONFIG_BASE(session, WT_SESSION_open_cursor);
	cfg[1] = "bulk,raw,skip_sort_check";
	cfg[2] = NULL;
	WT_ERR(__wt_open_cursor(session, chunk->uri, NULL, cfg, &dest));

#define	LSM_MERGE_CHECK_INTERVAL	WT_THOUSAND
	for (insert_count = 0; (ret = src->next(src)) == 0; insert_count++) {
		if (insert_count % LSM_MERGE_CHECK_INTERVAL == 0) {
			if (!F_ISSET(lsm_tree, WT_LSM_TREE_ACTIVE))
				WT_ERR(EINTR);

			WT_STAT_FAST_CONN_INCRV(session,
			    lsm_rows_merged, LSM_MERGE_CHECK_INTERVAL);
			++lsm_tree->merge_progressing;
		}

		WT_ERR(src->get_key(src, &key));
		dest->set_key(dest, &key);
		WT_ERR(src->get_value(src, &value));
		dest->set_value(dest, &value);
		WT_ERR(dest->insert(dest));
		if (create_bloom)
			WT_ERR(__wt_bloom_insert(bloom, &key));
	}
	WT_ERR_NOTFOUND_OK(ret);

	WT_STAT_FAST_CONN_INCRV(session,
	    lsm_rows_merged, insert_count % LSM_MERGE_CHECK_INTERVAL);
	++lsm_tree->merge_progressing;
	WT_ERR(__wt_verbose(session, WT_VERB_LSM,
	    "Bloom size for %" PRIu64 " has %" PRIu64 " items inserted.",
	    record_count, insert_count));

	/*
	 * Closing and syncing the files can take a while.  Set the
	 * merge_syncing field so that compact knows it is still in
	 * progress.
	 */
	(void)__wt_atomic_add32(&lsm_tree->merge_syncing, 1);
	in_sync = true;
	/*
	 * We've successfully created the new chunk.  Now install it.  We need
	 * to ensure that the NO_CACHE flag is cleared and the bloom filter
	 * is closed (even if a step fails), so track errors but don't return
	 * until we've cleaned up.
	 */
	WT_TRET(src->close(src));
	WT_TRET(dest->close(dest));
	src = dest = NULL;

	F_CLR(session, WT_SESSION_NO_CACHE);

	/*
	 * We're doing advisory reads to fault the new trees into cache.
	 * Don't block if the cache is full: our next unit of work may be to
	 * discard some trees to free space.
	 */
	F_SET(session, WT_SESSION_NO_EVICTION);

	if (create_bloom) {
		if (ret == 0)
			WT_TRET(__wt_bloom_finalize(bloom));

		/*
		 * Read in a key to make sure the Bloom filters btree handle is
		 * open before it becomes visible to application threads.
		 * Otherwise application threads will stall while it is opened
		 * and internal pages are read into cache.
		 */
		if (ret == 0) {
			WT_CLEAR(key);
			WT_TRET_NOTFOUND_OK(__wt_bloom_get(bloom, &key));
		}

		WT_TRET(__wt_bloom_close(bloom));
		bloom = NULL;
	}
	WT_ERR(ret);

	/*
	 * Open a handle on the new chunk before application threads attempt
	 * to access it, opening it pre-loads internal pages into the file
	 * system cache.
	 */
	cfg[1] = "checkpoint=" WT_CHECKPOINT;
	WT_ERR(__wt_open_cursor(session, chunk->uri, NULL, cfg, &dest));
	WT_TRET(dest->close(dest));
	dest = NULL;
	++lsm_tree->merge_progressing;
	(void)__wt_atomic_sub32(&lsm_tree->merge_syncing, 1);
	in_sync = false;
	WT_ERR_NOTFOUND_OK(ret);

	WT_ERR(__wt_lsm_tree_set_chunk_size(session, chunk));
	WT_ERR(__wt_lsm_tree_writelock(session, lsm_tree));
	locked = true;

	/*
	 * Check whether we raced with another merge, and adjust the chunk
	 * array offset as necessary.
	 */
	if (start_chunk >= lsm_tree->nchunks ||
	    lsm_tree->chunk[start_chunk]->id != start_id)
		for (start_chunk = 0;
		    start_chunk < lsm_tree->nchunks;
		    start_chunk++)
			if (lsm_tree->chunk[start_chunk]->id == start_id)
				break;

	/*
	 * It is safe to error out here - since the update can only fail
	 * prior to making updates to the tree.
	 */
	WT_ERR(__wt_lsm_merge_update_tree(
	    session, lsm_tree, start_chunk, nchunks, chunk));

	if (create_bloom)
		F_SET(chunk, WT_LSM_CHUNK_BLOOM);
	chunk->count = insert_count;
	chunk->generation = generation;
	F_SET(chunk, WT_LSM_CHUNK_ONDISK);

	/*
	 * We have no current way of continuing if the metadata update fails,
	 * so we will panic in that case.  Put some effort into cleaning up
	 * after ourselves here - so things have a chance of shutting down.
	 *
	 * Any errors that happened after the tree was locked are
	 * fatal - we can't guarantee the state of the tree.
	 */
	if ((ret = __wt_lsm_meta_write(session, lsm_tree)) != 0)
		WT_PANIC_ERR(session, ret, "Failed finalizing LSM merge");

	lsm_tree->dsk_gen++;

	/* Update the throttling while holding the tree lock. */
	__wt_lsm_tree_throttle(session, lsm_tree, true);

	/* Schedule a pass to discard old chunks */
	WT_ERR(__wt_lsm_manager_push_entry(
	    session, WT_LSM_WORK_DROP, 0, lsm_tree));

err:	if (locked)
		WT_TRET(__wt_lsm_tree_writeunlock(session, lsm_tree));
	if (in_sync)
		(void)__wt_atomic_sub32(&lsm_tree->merge_syncing, 1);
	if (src != NULL)
		WT_TRET(src->close(src));
	if (dest != NULL)
		WT_TRET(dest->close(dest));
	if (bloom != NULL)
		WT_TRET(__wt_bloom_close(bloom));
	if (ret != 0 && created_chunk) {
		/* Drop the newly-created files on error. */
		if (chunk->uri != NULL) {
			WT_WITH_SCHEMA_LOCK(session, tret =
			    __wt_schema_drop(session, chunk->uri, drop_cfg));
			WT_TRET(tret);
		}
		if (create_bloom && chunk->bloom_uri != NULL) {
			WT_WITH_SCHEMA_LOCK(session,
			    tret = __wt_schema_drop(
			    session, chunk->bloom_uri, drop_cfg));
			WT_TRET(tret);
		}
		__wt_free(session, chunk->bloom_uri);
		__wt_free(session, chunk->uri);
		__wt_free(session, chunk);

		if (ret == EINTR)
			WT_TRET(__wt_verbose(session, WT_VERB_LSM,
			    "Merge aborted due to close"));
		else
			WT_TRET(__wt_verbose(session, WT_VERB_LSM,
			    "Merge failed with %s",
			   __wt_strerror(session, ret, NULL, 0)));
	}
	F_CLR(session, WT_SESSION_NO_CACHE | WT_SESSION_NO_EVICTION);
	return (ret);
}