as_val * as_val_val_destroy(as_val * v)
{
if ( v == NULL || !v->count ) return v;
// if we reach the last reference, call the destructor, and free
if ( 0 == cf_atomic32_decr(&(v->count)) ) {
as_val_destroy_callbacks[ v->type ](v);
if ( v->free ) {
cf_free(v);
}
v = NULL;
}
return v;
}
//Same as do_the_full_monte, but only till the command is sent to the node.
//Most of the code is duplicated. Bad.
int
cl_do_async_monte(cl_cluster *asc, int info1, int info2, const char *ns, const char *set, const cl_object *key,
const cf_digest *digest, cl_bin **values, cl_operator operator, cl_operation **operations,
int *n_values, uint32_t *cl_gen, const cl_write_parameters *cl_w_p, uint64_t *trid, void *udata)
{
cl_async_work *workitem = NULL;
uint8_t wr_stack_buf[STACK_BUF_SZ];
uint8_t *wr_buf = wr_stack_buf;
size_t wr_buf_sz = sizeof(wr_stack_buf);
int progress_timeout_ms;
uint64_t deadline_ms;
uint64_t starttime, endtime;
bool network_error;
int fd = -1;
int rv = CITRUSLEAF_FAIL_CLIENT; //Assume that this is a failure;
// as_msg msg;
cf_digest d_ret;
cl_cluster_node *node = 0;
#if ONEASYNCFD
if (shash_get_size(g_cl_async_hashtab) >= g_async_h_szlimit) {
//cf_error("Async hashtab is full. Cannot insert any more elements");
return CITRUSLEAF_FAIL_ASYNCQ_FULL;
}
#else
//If the async buffer is at the max limit, do not entertain more requests.
if (cf_queue_sz(g_cl_async_q) >= cf_atomic32_get(g_async_q_szlimit)) {
//cf_error("Async buffer is full. Cannot insert any more elements");
return CITRUSLEAF_FAIL_ASYNCQ_FULL;
}
#endif
//Allocate memory for work item that will be added to the async work list
if (cf_queue_sz(g_cl_workitems_freepool_q) > 0) {
cf_queue_pop(g_cl_workitems_freepool_q, &workitem, CF_QUEUE_FOREVER);
} else {
workitem = malloc(sizeof(cl_async_work));
if (workitem == NULL) {
return CITRUSLEAF_FAIL_CLIENT;
}
}
//Compile the write buffer to be sent to the cluster
if (n_values && ( values || operations) ){
cl_compile(info1, info2, 0, ns, set, key, digest, values?*values:NULL, operator, operations?*operations:NULL,
*n_values , &wr_buf, &wr_buf_sz, cl_w_p, &d_ret, *trid,NULL,NULL, 0 /*udf_type*/);
}else{
cl_compile(info1, info2, 0, ns, set, key, digest, 0, 0, 0, 0, &wr_buf, &wr_buf_sz, cl_w_p, &d_ret, *trid,NULL,NULL, 0 /*udf_type*/);
}
deadline_ms = 0;
progress_timeout_ms = 0;
if (cl_w_p && cl_w_p->timeout_ms) {
deadline_ms = cf_getms() + cl_w_p->timeout_ms;
// policy: if asking for a long timeout, give enough time to try twice
if (cl_w_p->timeout_ms > 700) {
progress_timeout_ms = cl_w_p->timeout_ms / 2;
}
else {
progress_timeout_ms = cl_w_p->timeout_ms;
}
}
else {
progress_timeout_ms = g_async_nw_progress_timeout;
}
//Initialize the async work unit
workitem->trid = *trid;
workitem->deadline = deadline_ms;
workitem->starttime = cf_getms();
workitem->udata = udata;
as_msg *msgp;
// Hate special cases, but we have to clear the verify bit on delete verify
if ( (info2 & CL_MSG_INFO2_DELETE) && (info1 & CL_MSG_INFO1_VERIFY))
{
msgp = (as_msg *)wr_buf;
msgp->m.info1 &= ~CL_MSG_INFO1_VERIFY;
}
if (asc->compression_stat.compression_threshold > 0
&& wr_buf_sz > (size_t)asc->compression_stat.compression_threshold)
{
/* Compression is enabled.
* Packet size is above threshold.
* Compress the data
*/
uint8_t *compressed_buf = NULL;
size_t compressed_buf_sz = 0;
// Contstruct packet for compressed data.
cf_packet_compression (wr_buf, wr_buf_sz, &compressed_buf, &compressed_buf_sz);
if (compressed_buf)
{
// If original packet size is > 16k, cl_compile had allocated memory for it.
// Free that memory.
// cf_packet_compression will allocate memory for compressed packet
if (wr_buf != wr_stack_buf) {
free(wr_buf);
}
// Update stats.
citrusleaf_cluster_put_compression_stat(asc, wr_buf_sz, compressed_buf_sz);
wr_buf = compressed_buf;
wr_buf_sz = compressed_buf_sz;
//memcpy (wr_buf, compressed_buf, compressed_buf_sz);
//wr_buf_sz = compressed_buf_sz;
//free (compressed_buf);
}
//else compression failed, continue with uncompressed packet
else
{
// Set compression stat
citrusleaf_cluster_put_compression_stat(asc, wr_buf_sz, wr_buf_sz);
}
}
int try = 0;
// retry request based on the write_policy
do {
network_error = false;
try++;
#ifdef DEBUG
if (try > 1) {
cf_debug("request retrying try %d tid %zu", try, (uint64_t)pthread_self());
}
#endif
// Get an FD from a cluster. First get the probable node for the given digest.
node = cl_cluster_node_get(asc, ns, &d_ret, info2 & CL_MSG_INFO2_WRITE ? true : false);
if (!node) {
#ifdef DEBUG
cf_debug("warning: no healthy nodes in cluster, retrying");
#endif
usleep(10000); //Sleep for 10ms
goto Retry;
}
// Now get the dedicated async FD of this node
starttime = cf_getms();
fd = cl_cluster_node_fd_get(node, true);
endtime = cf_getms();
if ((endtime - starttime) > 10) {
cf_debug("Time to get FD for a node (>10ms)=%"PRIu64, (endtime - starttime));
}
if (fd == -1) {
#ifdef DEBUG
cf_debug("warning: node %s has no async file descriptors, retrying transaction (tid %zu)",node->name,(uint64_t)pthread_self() );
#endif
usleep(1000);
goto Retry;
}
// Send the command to the node
starttime = cf_getms();
rv = cf_socket_write_timeout(fd, wr_buf, wr_buf_sz, deadline_ms, progress_timeout_ms);
endtime = cf_getms();
if ((endtime - starttime) > 10) {
cf_debug("Time to write to the socket (>10ms)=%"PRIu64, (endtime - starttime));
}
if (rv != 0) {
cf_debug("Citrusleaf: write timeout or error when writing header to server - %d fd %d errno %d (tid %zu)",
rv,fd,errno,(uint64_t)pthread_self());
if (rv != ETIMEDOUT)
network_error = true;
goto Retry;
}
goto Ok;
Retry:
if (network_error == true) {
/*
* In case of Async work (for XDS), it may be extreme to
* dun a node in case of network error. We just cleanup
* things and retry to connect to the remote cluster.
* The network error may be a transient one. As this is a
* network error, its is better to wait for some significant
* time before retrying.
*/
sleep(1); //Sleep for 1sec
#if ONEASYNCFD
//Do not close the FD
#else
cf_error("async sender: Closing the fd %d because of network error", fd);
cf_close(fd);
fd = -1;
#endif
}
if (fd != -1) {
cf_error("async sender: Closing the fd %d because of retry", fd);
cf_close(fd);
fd = -1;
}
if (node) {
cl_cluster_node_put(node);
node = 0;
}
if (deadline_ms && (deadline_ms < cf_getms() ) ) {
#ifdef DEBUG
cf_debug("async sender: out of time : deadline %"PRIu64" now %"PRIu64, deadline_ms, cf_getms());
#endif
rv = CITRUSLEAF_FAIL_TIMEOUT;
goto Error;
}
} while ( (cl_w_p == 0) || (cl_w_p->w_pol == CL_WRITE_RETRY) );
Error:
#ifdef DEBUG
cf_debug("exiting with failure: network_error %d wpol %d timeleft %d rv %d",
(int)network_error, (int)(cl_w_p ? cl_w_p->w_pol : 0),
(int)(deadline_ms - cf_getms() ), rv );
#endif
if (wr_buf != wr_stack_buf) {
free(wr_buf);
}
#if ONEASYNCFD
//Do not close the FD
#else
//If it is a network error, the fd would be closed and set to -1.
//So, we reach this place with a valid FD in case of timeout.
if (fd != -1) {
cf_error("async sender: Closing the fd %d because of timeout", fd);
cf_close(fd);
}
#endif
return(rv);
Ok:
/*
* We cannot release the node here as the asyc FD associated
* with this node may get closed. We should do it only when
* we got back the ack for the async command that we just did.
*/
//As we sent the command successfully, add it to the async work list
workitem->node = node;
workitem->fd = fd;
//We are storing only the pointer to the workitem
#if ONEASYNCFD
if (shash_put_unique(g_cl_async_hashtab, trid, &workitem) != SHASH_OK) {
//This should always succeed.
cf_error("Unable to add unique entry into the hash table");
}
cf_queue_push(node->asyncwork_q, &workitem); //Also put in the node's q
#else
cf_queue_push(g_cl_async_q, &workitem);
#endif
if (wr_buf != wr_stack_buf) {
free(wr_buf);
}
rv = CITRUSLEAF_OK;
return rv;
}
int citrusleaf_async_reinit(int size_limit, unsigned int num_receiver_threads)
{
// int num_threads;
if (0 == cf_atomic32_get(g_async_initialized)) {
cf_error("Async client not initialized cannot reinit");
return -1;
}
if (num_receiver_threads > MAX_ASYNC_RECEIVER_THREADS) {
//Limit the threads to the max value even if caller asks for it
num_receiver_threads = MAX_ASYNC_RECEIVER_THREADS;
}
// If number of thread is increased create more threads
if (num_receiver_threads > g_async_num_threads) {
unsigned int i;
for (i = g_async_num_threads; i < num_receiver_threads; i++) {
pthread_create(&g_async_reciever[i], 0, async_receiver_fn, NULL);
}
}
else {
// else just reset the number the async threads will kill themselves
cf_atomic32_set(&g_async_num_threads, num_receiver_threads);
}
cf_atomic32_set(&g_async_q_szlimit , size_limit);
return ( 0 );
}
int citrusleaf_async_init(int size_limit, int num_receiver_threads, cl_async_fail_cb fail_cb_fn, cl_async_success_cb success_cb_fn)
{
int i, num_threads;
//Make sure that we do the initialization only once
if (1 == cf_atomic32_incr(&g_async_initialized)) {
// Start the receiver threads
num_threads = num_receiver_threads;
if (num_threads > MAX_ASYNC_RECEIVER_THREADS) {
//Limit the threads to the max value even if caller asks for it
num_threads = MAX_ASYNC_RECEIVER_THREADS;
}
#if ONEASYNCFD
g_async_h_szlimit = size_limit * 3; //Max number of elements in the hash table
g_async_h_buckets = g_async_h_szlimit/10;//Number of buckets in the hash table
if (shash_create(&g_cl_async_hashtab, async_trid_hash, sizeof(uint64_t), sizeof(cl_async_work *),
g_async_h_buckets, SHASH_CR_MT_BIGLOCK) != SHASH_OK) {
cf_error("Failed to initialize the async work hastable");
cf_atomic32_decr(&g_async_initialized);
return -1;
}
#else
// create work queue
g_async_q_szlimit = size_limit;
if ((g_cl_async_q = cf_queue_create(sizeof(cl_async_work *), true)) == NULL) {
cf_error("Failed to initialize the async work queue");
cf_atomic32_decr(&g_async_initialized);
return -1;
}
for (i=0; i<num_threads; i++) {
pthread_create(&g_async_reciever[i], 0, async_receiver_fn, NULL);
}
g_async_num_threads = num_threads;
#endif
if ((g_cl_workitems_freepool_q = cf_queue_create(sizeof(cl_async_work *), true)) == NULL) {
cf_error("Failed to create memory pool for workitems");
return -1;
}
g_fail_cb_fn = fail_cb_fn;
g_success_cb_fn = success_cb_fn;
// Initialize the stats
g_async_stats.retries = 0;
g_async_stats.dropouts = 0;
}
return(0);
}
static void*
async_receiver_fn(void *thdata)
{
int rv = -1;
bool network_error = false;
cl_async_work *workitem = NULL;
// cl_async_work *tmpworkitem = NULL;
as_msg msg;
cf_queue *q_to_use = NULL;
cl_cluster_node *thisnode = NULL;
uint8_t rd_stack_buf[STACK_BUF_SZ];
uint8_t *rd_buf = rd_stack_buf;
size_t rd_buf_sz = 0;
uint64_t acktrid;
// uint64_t starttime, endtime;
int progress_timeout_ms;
unsigned int thread_id = cf_atomic32_incr(&g_thread_count);
if (thdata == NULL) {
q_to_use = g_cl_async_q;
} else {
thisnode = (cl_cluster_node *)thdata;
q_to_use = thisnode->asyncwork_q;
}
//Infinite loop which keeps picking work items from the list and try to find the end result
while(1) {
network_error = false;
#if ONEASYNCFD
if(thisnode->dunned == true) {
do {
rv = cf_queue_pop(thisnode->asyncwork_q, &workitem, CF_QUEUE_NOWAIT);
if (rv == CF_QUEUE_OK) {
cl_cluster_node_put(thisnode);
free(workitem);
}
} while (rv == CF_QUEUE_OK);
//We want to delete all the workitems of this node
shash_reduce_delete(g_cl_async_hashtab, cl_del_node_asyncworkitems, thisnode);
break;
}
#endif
//This call will block if there is no element in the queue
cf_queue_pop(q_to_use, &workitem, CF_QUEUE_FOREVER);
//TODO: What if the node gets dunned while this pop call is blocked ?
#if ONEASYNCFD
//cf_debug("Elements remaining in this node's queue=%d, Hash table size=%d",
// cf_queue_sz(thisnode->asyncwork_q), shash_get_size(g_cl_async_hashtab));
#endif
// If we have no progress in 50ms, we should move to the next workitem
// and revisit this workitem at a later stage
progress_timeout_ms = DEFAULT_PROGRESS_TIMEOUT;
// Read into this fine cl_msg, which is the short header
rv = cf_socket_read_timeout(workitem->fd, (uint8_t *) &msg, sizeof(as_msg), workitem->deadline, progress_timeout_ms);
if (rv) {
#if DEBUG
cf_debug("Citrusleaf: error when reading header from server - rv %d fd %d", rv, workitem->fd);
#endif
if (rv != ETIMEDOUT) {
cf_error("Citrusleaf: error when reading header from server - rv %d fd %d",rv,workitem->fd);
network_error = true;
goto Error;
} else {
goto Retry;
}
}
#ifdef DEBUG_VERBOSE
dump_buf("read header from cluster", (uint8_t *) &msg, sizeof(cl_msg));
#endif
cl_proto_swap(&msg.proto);
cl_msg_swap_header(&msg.m);
// second read for the remainder of the message
rd_buf_sz = msg.proto.sz - msg.m.header_sz;
if (rd_buf_sz > 0) {
if (rd_buf_sz > sizeof(rd_stack_buf)) {
rd_buf = malloc(rd_buf_sz);
if (!rd_buf) {
cf_error("malloc fail: trying %zu",rd_buf_sz);
rv = -1;
goto Error;
}
}
rv = cf_socket_read_timeout(workitem->fd, rd_buf, rd_buf_sz, workitem->deadline, progress_timeout_ms);
if (rv) {
//We already read some part of the message before but failed to read the
//remaining data for whatever reason (network error or timeout). We cannot
//reread as we already read partial data. Declare this as error.
cf_error("Timeout after reading the header but before reading the body");
goto Error;
}
#ifdef DEBUG_VERBOSE
dump_buf("read body from cluster", rd_buf, rd_buf_sz);
#endif
}
rv = CITRUSLEAF_OK;
goto Ok;
Retry:
//We are trying to postpone the reading
if (workitem->deadline && workitem->deadline < cf_getms()) {
cf_error("async receiver: out of time : deadline %"PRIu64" now %"PRIu64,
workitem->deadline, cf_getms());
//cf_error("async receiver: Workitem missed the final deadline");
rv = CITRUSLEAF_FAIL_TIMEOUT;
goto Error;
} else {
//We have time. Push the element back to the queue to be considered later
cf_queue_push(q_to_use, &workitem);
}
//If we allocated memory in this loop, release it.
if (rd_buf && (rd_buf != rd_stack_buf)) {
free(rd_buf);
}
cf_atomic_int_incr(&g_async_stats.retries);
continue;
Error:
if (network_error == true) {
/*
* In case of Async work (for XDS), it may be extreme to
* dun a node in case of network error. We just cleanup
* things and retry to connect to the remote cluster.
* The network error may be a transient one.
*/
}
#if ONEASYNCFD
//Do not close FD
#else
//We do not know the state of FD. It may have pending data to be read.
//We cannot reuse the FD. So, close it to be on safe side.
cf_error("async receiver: Closing the fd %d because of error", workitem->fd);
cf_close(workitem->fd);
workitem->fd = -1;
#endif
cf_atomic_int_incr(&g_async_stats.dropouts);
//Continue down with what we do during an Ok
//Inform the caller that there is no response from the server for this workitem.
//No response does not mean that the work is not done. The work might be
//successfully completed on the server side, we just didnt get response for it.
if (g_fail_cb_fn) {
g_fail_cb_fn(workitem->udata, rv, workitem->starttime);
}
Ok:
//rd_buf may not be there during an error condition.
if (rd_buf && (rv == CITRUSLEAF_OK)) {
//As of now, async functionality is there only for put call.
//In put call, we do not get anything back other than the trid field.
//So, just pass variable to get back the trid and ignore others.
if (0 != cl_parse(&msg.m, rd_buf, rd_buf_sz, NULL, NULL, NULL, &acktrid, NULL)) {
rv = CITRUSLEAF_FAIL_UNKNOWN;
}
else {
rv = msg.m.result_code;
if (workitem->trid != acktrid) {
#if ONEASYNCFD
//It is likely that we may get response for a different trid.
//Just delete the correct one from the queue
//put back the current workitem back in the queue.
shash_get(g_cl_async_hashtab, &acktrid, &tmpworkitem);
cf_queue_delete(q_to_use, &tmpworkitem, true);
cf_queue_push(q_to_use, &workitem);
//From now on workitem will be the one for which we got ack
workitem = tmpworkitem;
#endif
#ifdef DEBUG
cf_debug("Got reply for a different trid. Expected=%"PRIu64" Got=%"PRIu64" FD=%d",
workitem->trid, acktrid, workitem->fd);
#endif
}
}
if (g_success_cb_fn) {
g_success_cb_fn(workitem->udata, rv, workitem->starttime);
}
}
//Remember to put back the FD into the pool, if it is re-usable.
if (workitem->fd != -1) {
cl_cluster_node_fd_put(workitem->node, workitem->fd, true);
}
//Also decrement the reference count for this node
cl_cluster_node_put(workitem->node);
#if ONEASYNCFD
//Delete the item from the global hashtable
if (shash_delete(g_cl_async_hashtab, &workitem->trid) != SHASH_OK)
{
#if DEBUG
cf_debug("Failure while trying to delete trid=%"PRIu64" from hashtable", workitem->trid);
#endif
}
#endif
//Push it back into the free pool. If the attempt fails, free it.
if (cf_queue_push(g_cl_workitems_freepool_q, &workitem) == -1) {
free(workitem);
}
//If we allocated memory in this loop, release it.
if (rd_buf && (rd_buf != rd_stack_buf)) {
free(rd_buf);
}
// Kick this thread out if its ID is greater than total
if (thread_id > cf_atomic32_get(g_async_num_threads)) {
cf_atomic32_decr(&g_thread_count);
return NULL;
}
}//The infnite loop
return NULL;
}