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/*-
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
#include "wt_internal.h"
static int __lsm_worker_general_op(
WT_SESSION_IMPL *, WT_LSM_WORKER_ARGS *, int *);
static void * __lsm_worker(void *);
/*
* __wt_lsm_worker_start --
* A wrapper around the LSM worker thread start
*/
int
__wt_lsm_worker_start(WT_SESSION_IMPL *session, WT_LSM_WORKER_ARGS *args)
{
return (__wt_thread_create(session, &args->tid, __lsm_worker, args));
}
/*
* __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, int *completed)
{
WT_DECL_RET;
WT_LSM_CHUNK *chunk;
WT_LSM_WORK_UNIT *entry;
int force, last;
*completed = 0;
if (!F_ISSET(cookie, WT_LSM_WORK_FLUSH) &&
!F_ISSET(cookie, WT_LSM_WORK_DROP) &&
!F_ISSET(cookie, WT_LSM_WORK_BLOOM))
return (WT_NOTFOUND);
if ((ret = __wt_lsm_manager_pop_entry(session,
cookie->flags, &entry)) != 0 || entry == NULL)
return (ret);
if ((entry->flags & WT_LSM_WORK_MASK) == WT_LSM_WORK_FLUSH) {
force = F_ISSET(entry, WT_LSM_WORK_FORCE);
F_CLR(entry, WT_LSM_WORK_FORCE);
last = 0;
WT_ERR(__wt_lsm_get_chunk_to_flush(session,
entry->lsm_tree, force, &last, &chunk));
/*
* If we got a chunk to flush, checkpoint it.
*/
if (chunk != NULL) {
WT_ERR(__wt_verbose(session, WT_VERB_LSM,
"Flush%s%s chunk %d %s",
force ? " w/ force" : "",
last ? " last" : "",
chunk->id, chunk->uri));
ret = __wt_lsm_checkpoint_chunk(
session, entry->lsm_tree, chunk);
WT_ASSERT(session, chunk->refcnt > 0);
(void)WT_ATOMIC_SUB(chunk->refcnt, 1);
WT_ERR(ret);
}
/*
* If we flushed the last chunk for a compact, clear the
* flag so compact knows that is complete.
*/
if (last && force &&
F_ISSET(entry->lsm_tree, WT_LSM_TREE_COMPACT_FLUSH))
F_CLR(entry->lsm_tree, WT_LSM_TREE_COMPACT_FLUSH);
} else if (entry->flags == WT_LSM_WORK_DROP)
WT_ERR(__wt_lsm_free_chunks(session, entry->lsm_tree));
else if (entry->flags == WT_LSM_WORK_BLOOM) {
WT_ERR(__wt_lsm_work_bloom(session, entry->lsm_tree));
WT_ERR(__wt_lsm_manager_push_entry(
session, WT_LSM_WORK_MERGE, entry->lsm_tree));
}
*completed = 1;
err: __wt_lsm_manager_free_work_unit(session, entry);
return (ret);
}
/*
* __lsm_worker --
* A thread that executes work units for all open LSM trees.
*/
static void *
__lsm_worker(void *arg)
{
WT_CONNECTION_IMPL *conn;
WT_DECL_RET;
WT_LSM_WORK_UNIT *entry;
WT_LSM_WORKER_ARGS *cookie;
WT_SESSION_IMPL *session;
int progress, ran;
cookie = (WT_LSM_WORKER_ARGS *)arg;
session = cookie->session;
conn = S2C(session);
entry = NULL;
while (F_ISSET(conn, WT_CONN_SERVER_RUN)) {
progress = 0;
/* Switches are always a high priority */
while (F_ISSET(cookie, WT_LSM_WORK_SWITCH) &&
(ret = __wt_lsm_manager_pop_entry(
session, WT_LSM_WORK_SWITCH, &entry)) == 0 &&
entry != NULL)
WT_ERR(
__wt_lsm_work_switch(session, &entry, &progress));
/* Flag an error if the pop failed. */
WT_ERR(ret);
ret = __lsm_worker_general_op(session, cookie, &ran);
if (ret == EBUSY || ret == WT_NOTFOUND)
ret = 0;
WT_ERR(ret);
progress = progress || ran;
if (F_ISSET(cookie, WT_LSM_WORK_MERGE) &&
(ret = __wt_lsm_manager_pop_entry(
session, WT_LSM_WORK_MERGE, &entry)) == 0 &&
entry != NULL) {
WT_ASSERT(session, entry->flags == WT_LSM_WORK_MERGE);
ret = __wt_lsm_merge(session,
entry->lsm_tree, cookie->id);
if (ret == WT_NOTFOUND) {
F_CLR(entry->lsm_tree, WT_LSM_TREE_COMPACTING);
ret = 0;
} else if (ret == EBUSY)
ret = 0;
/* Clear any state */
WT_CLEAR_BTREE_IN_SESSION(session);
__wt_lsm_manager_free_work_unit(session, entry);
entry = NULL;
progress = 1;
}
/* Flag an error if the pop failed. */
WT_ERR(ret);
/* Don't busy wait if there isn't any work to do. */
if (!progress) {
WT_ERR(
__wt_cond_wait(session, cookie->work_cond, 10000));
continue;
}
}
if (ret != 0) {
err: __wt_lsm_manager_free_work_unit(session, entry);
__wt_err(session, ret,
"Error in LSM worker thread %d", cookie->id);
}
return (NULL);
}
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