Kfs multi-proceses write() the same chunkId concurrently

[du fu]

Hi
It was said that primary-mast-chunk have the lease to prevent
write concurrently.
It seems not true. Is there something missing?

use kfs-0.5 with the following code.

.......

if ((fd = gKfsClient->Open(fileName, O_RDWR|O_CREAT)) < 0) {
cout << "Open on : " << fileName << " failed!" <<
KFS::ErrorCodeToStr(fd) << endl;
exit(-1);
}
off_t offFile;
if ((offFile = gKfsClient->Seek(fd, 0000000000L, SEEK_SET)) < 1) {
cout << "seek to failed!" << KFS::ErrorCodeToStr(offFile) <<
endl;
exit(-1);
}
int ntimes = 3;
while (ntimes--)
{
offFile = gKfsClient->Tell(fd);
if (offFile < 0) {
cout << "Tell failed! " << KFS::ErrorCodeToStr(offFile) <<
endl;
exit(-1);
}
int numBytes = 16;
char *dataBuf = new char[numBytes];
char c = 'M' - ntimes;
memset(dataBuf, c, numBytes);
res = gKfsClient->Write(fd, dataBuf, numBytes);
if (res < 0) {
cout << "Write failed!" << KFS::ErrorCodeToStr(res) << endl;
exit(-1);
}
else if (res < numBytes) {
cout << "Was able to write only: " << res << " instead of " <<
numBytes << endl;
}
cout << "Write at " << offFile << " char " << c << " bytes " <<
numBytes << endl;
delete dataBuf;
}
gKfsClient->Close(fd);