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Diskless replication: child -> parent communication improved.

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Child now reports full info to the parent including IDs of slaves in
failure state and exit code.
This commit is contained in:
antirez 2014-10-23 23:10:33 +02:00
parent b50e3215d2
commit ebb3bd53c2
1 changed files with 34 additions and 20 deletions
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54
src/rdb.c
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@ -1292,11 +1292,11 @@ void backgroundSaveDoneHandlerSocket(int exitcode, int bysignal) {
server.rdb_save_time_start = -1;
/* If the child returns an OK exit code, read the set of slave client
* IDs that received the full RDB payload, closing all the slaves
* which are not among the ones listed.
* IDs and the associated status code. We'll terminate all the slaves
* in error state.
*
* If the process returned an error, consider the list of slaves that
* can continue to be emtpy, so that it's just a speical case of the
* can continue to be emtpy, so that it's just a special case of the
* normal code path. */
ok_slaves = zmalloc(sizeof(uint64_t)); /* Make space for the count. */
ok_slaves[0] = 0;
@ -1306,7 +1306,7 @@ void backgroundSaveDoneHandlerSocket(int exitcode, int bysignal) {
if (read(server.rdb_pipe_read_result_from_child, ok_slaves, readlen) ==
readlen)
{
readlen = ok_slaves[0]*sizeof(uint64_t);
readlen = ok_slaves[0]*sizeof(uint64_t)*2;
/* Make space for enough elements as specified by the first
* uint64_t element in the array. */
@ -1334,14 +1334,23 @@ void backgroundSaveDoneHandlerSocket(int exitcode, int bysignal) {
if (slave->replstate == REDIS_REPL_WAIT_BGSAVE_END) {
uint64_t j;
int errorcode = 0;
/* Search for the slave ID in the reply. In order for a slave to
* continue the replication process, we need to find it in the list,
* and it must have an error code set to 0 (which means success). */
for (j = 0; j < ok_slaves[0]; j++) {
if (slave->id == ok_slaves[j+1]) break; /* Found in OK list. */
if (slave->id == ok_slaves[2*j+1]) {
errorcode = ok_slaves[2*j+2];
break; /* Found in slaves list. */
}
}
if (j == ok_slaves[0]) {
if (j == ok_slaves[0] || errorcode != 0) {
redisLog(REDIS_WARNING,
"Closing slave %llu: child->slave RDB transfer failed.",
slave->id);
"Closing slave %llu: child->slave RDB transfer failed: %s",
slave->id,
(errorcode == 0) ? "RDB transfer child aborted"
: strerror(errorcode));
freeClient(slave);
} else {
redisLog(REDIS_WARNING,
@ -1448,29 +1457,34 @@ int rdbSaveToSlavesSockets(void) {
/* If we are returning OK, at least one slave was served
* with the RDB file as expected, so we need to send a report
* to the parent via the pipe. The format of the message is:
* just an array of uint64_t integers (to avoid alignment concerns),
* where the first element is the number of uint64_t elements
* that follows, representing slave client IDs that were
* successfully served. */
void *msg = zmalloc(sizeof(uint64_t)*(1+numfds));
*
* <len> <slave[0].id> <slave[0].error> ...
*
* len, slave IDs, and slave errors, are all uint64_t integers,
* so basically the reply is composed of 64 bits for the len field
* plus 2 additional 64 bit integers for each entry, for a total
* of 'len' entries.
*
* The 'id' represents the slave's client ID, so that the master
* can match the report with a specific slave, and 'error' is
* set to 0 if the replication process terminated with a success
* or the error code if an error occurred. */
void *msg = zmalloc(sizeof(uint64_t)*(1+2*numfds));
uint64_t *len = msg;
uint64_t *ids = len+1;
int j, msglen;
*len = 0;
*len = numfds;
for (j = 0; j < numfds; j++) {
/* No error? Add it. */
if (slave_sockets.io.fdset.state[j] == 0) {
ids[*len] = clientids[j];
(*len)++;
}
*ids++ = clientids[j];
*ids++ = slave_sockets.io.fdset.state[j];
}
/* Write the message to the parent. If we have no good slaves or
* we are unable to transfer the message to the parent, we exit
* with an error so that the parent will abort the replication
* process with all the childre that were waiting. */
msglen = sizeof(uint64_t)*(1+(*len));
msglen = sizeof(uint64_t)*(1+2*numfds);
if (*len == 0 ||
write(server.rdb_pipe_write_result_to_parent,msg,msglen)
!= msglen)