示例#1
0
// if there aren't enough replicas of this chunk,
// pick new hosts and start downloads
//
int CHUNK::assign() {
    if (!present_on_server) return 0;
    VDA_FILE_AUX* fp = parent->dfile;
    while ((int)(hosts.size()) < fp->policy.replication) {
#if 0
        if (parent->dfile->unused_hosts.size() == 0) {
            die("no more hosts!\n");
        }
        set<SIM_HOST*>::iterator i = fp->unused_hosts.begin();
        SIM_HOST* h = *i;
        fp->unused_hosts.erase(i);
#else
        SIM_HOST* h = new SIM_HOST;
        sim.insert(h);
#endif
        CHUNK_ON_HOST *c = new CHUNK_ON_HOST();
        sprintf(c->physical_file_name, "chunk %s on host %d", name, h->id);
#ifdef EVENT_DEBUG
        printf("%s: assigning chunk %s to host %d\n", now_str(), name, h->id);
#endif
        c->host = h;
        c->chunk = this;
        h->chunks.insert(c);
        hosts.insert(c);
        c->start_download();
    }
    return 0;
}
示例#2
0
// if there aren't enough replicas of this chunk,
// pick new hosts and start downloads
//
void CHUNK::assign() {
    if (!present_on_server) return;
    while ((int)(hosts.size()) < p.replication) {
#if 0
        if (parent->dfile->unused_hosts.size() == 0) {
            die("no more hosts!\n");
        }
        set<HOST*>::iterator i = parent->dfile->unused_hosts.begin();
        HOST* h = *i;
        parent->dfile->unused_hosts.erase(i);
#else
        HOST* h = new HOST;
        sim.insert(h);
#endif
        CHUNK_ON_HOST *c = new CHUNK_ON_HOST();
        sprintf(c->name, "chunk %s on host %d", name, h->id);
#ifdef EVENT_DEBUG
        printf("%s: assigning chunk %s to host %d\n", now_str(), name, h->id);
#endif
        c->host = h;
        c->chunk = this;
        h->chunks.insert(c);
        hosts.insert(c);
        c->start_download();
    }
}
示例#3
0
bool CHUNK::download_in_progress() {
    set<CHUNK_ON_HOST*>::iterator i;
    for (i=hosts.begin(); i!=hosts.end(); i++) {
        CHUNK_ON_HOST* c = *i;
        if (c->download_in_progress()) return true;
    }
    return false;
}
示例#4
0
void CHUNK::start_upload() {
    // if no upload of this chunk is in progress, start one.
    // NOTE: all instances are inherently present_on_host,
    // since this is only called if chunk is not present on server
    //
    CHUNK_ON_HOST* c;
    set<CHUNK_ON_HOST*>::iterator i;
    for (i=hosts.begin(); i!=hosts.end(); i++) {
        c = *i;
        if (c->transfer_in_progress) return;
    }
    c = *(hosts.begin());
    c->start_upload();
}
示例#5
0
// the host has failed
//
void SIM_HOST::handle() {
    set<SIM_HOST*>::iterator i = hosts.find(this);
    hosts.erase(i);

#ifdef EVENT_DEBUG
    printf("%s: host %d failed\n", now_str(), id);
#endif
    set<CHUNK_ON_HOST*>::iterator p;
    for (p = chunks.begin(); p != chunks.end(); p++) {
        CHUNK_ON_HOST* c = *p;
        c->chunk->host_failed(c);
        c->remove();
        delete c;
    }
}