6a2d6a1cd4
git-svn-id: svn+ssh://svn.corp.yahoo.com/yahoo/yrl/labs/pnuts/code/logstore@613 8dad8b1f-cf64-0410-95b6-bcf113ffbcfe
342 lines
9 KiB
C++
342 lines
9 KiB
C++
#include "logstore.h"
|
|
#include "datapage.h"
|
|
#include <stasis/page.h>
|
|
|
|
static const int DATA_PAGE = USER_DEFINED_PAGE(1);
|
|
#define MAX_PAGE_COUNT 1000 // ~ 4MB
|
|
|
|
BEGIN_C_DECLS
|
|
static void dataPageFsck(Page* p) {
|
|
int32_t is_last_page = *stasis_page_int32_cptr_from_start(p, 0);
|
|
assert(is_last_page == 0 || is_last_page == 1 || is_last_page == 2);
|
|
}
|
|
static void dataPageLoaded(Page* p) {
|
|
dataPageFsck(p);
|
|
}
|
|
static void dataPageFlushed(Page* p) {
|
|
*stasis_page_lsn_ptr(p) = p->LSN;
|
|
dataPageFsck(p);
|
|
}
|
|
static int notSupported(int xid, Page * p) { return 0; }
|
|
|
|
static lsn_t get_lsn(int xid) {
|
|
lsn_t xid_lsn = stasis_transaction_table_get((stasis_transaction_table_t*)stasis_runtime_transaction_table(), xid)->prevLSN;
|
|
lsn_t log_lsn = ((stasis_log_t*)stasis_log())->next_available_lsn((stasis_log_t*)stasis_log());
|
|
lsn_t ret = xid_lsn == INVALID_LSN ? log_lsn-1 : xid_lsn;
|
|
assert(ret != INVALID_LSN);
|
|
return ret;
|
|
}
|
|
|
|
END_C_DECLS
|
|
|
|
template <class TUPLE>
|
|
void DataPage<TUPLE>::register_stasis_page_impl() {
|
|
static page_impl pi = {
|
|
DATA_PAGE,
|
|
1,
|
|
0, //slottedRead,
|
|
0, //slottedWrite,
|
|
0,// readDone
|
|
0,// writeDone
|
|
0,//slottedGetType,
|
|
0,//slottedSetType,
|
|
0,//slottedGetLength,
|
|
0,//slottedFirst,
|
|
0,//slottedNext,
|
|
0,//slottedLast,
|
|
notSupported, // is block supported
|
|
stasis_block_first_default_impl,
|
|
stasis_block_next_default_impl,
|
|
stasis_block_done_default_impl,
|
|
0,//slottedFreespace,
|
|
0,//slottedCompact,
|
|
0,//slottedCompactSlotIDs,
|
|
0,//slottedPreRalloc,
|
|
0,//slottedPostRalloc,
|
|
0,//slottedSpliceSlot,
|
|
0,//slottedFree,
|
|
0,//XXX page_impl_dereference_identity,
|
|
dataPageLoaded, //dataPageLoaded,
|
|
dataPageFlushed, //dataPageFlushed,
|
|
0,//slottedCleanup
|
|
};
|
|
stasis_page_impl_register(pi);
|
|
|
|
}
|
|
|
|
template <class TUPLE>
|
|
DataPage<TUPLE>::DataPage(int xid, pageid_t pid):
|
|
xid_(xid),
|
|
page_count_(1), // will be opportunistically incremented as we scan the datapage.
|
|
initial_page_count_(-1), // used by append.
|
|
alloc_(0), // read-only, and we don't free data pages one at a time.
|
|
first_page_(pid),
|
|
write_offset_(-1) {
|
|
assert(pid!=0);
|
|
Page *p = loadPage(xid_, first_page_);
|
|
if(!(*is_another_page_ptr(p) == 0 || *is_another_page_ptr(p) == 2)) {
|
|
printf("Page %lld is not the start of a datapage\n", first_page_); fflush(stdout);
|
|
abort();
|
|
}
|
|
assert(*is_another_page_ptr(p) == 0 || *is_another_page_ptr(p) == 2); // would be 1 for page in the middle of a datapage
|
|
releasePage(p);
|
|
}
|
|
|
|
template <class TUPLE>
|
|
DataPage<TUPLE>::DataPage(int xid, pageid_t page_count, RegionAllocator *alloc) :
|
|
xid_(xid),
|
|
page_count_(1),
|
|
initial_page_count_(page_count),
|
|
alloc_(alloc),
|
|
first_page_(alloc_->alloc_extent(xid_, page_count_)),
|
|
write_offset_(0)
|
|
{
|
|
DEBUG("Datapage page count: %lld pid = %lld\n", (long long int)page_count_, (long long int)first_page_);
|
|
assert(page_count_ >= 1);
|
|
initialize();
|
|
}
|
|
|
|
template<class TUPLE>
|
|
void DataPage<TUPLE>::initialize()
|
|
{
|
|
//load the first page
|
|
Page *p = loadUninitializedPage(xid_, first_page_);
|
|
writelock(p->rwlatch,0);
|
|
|
|
DEBUG("\t\t\t\t\t\t->%lld\n", first_page_);
|
|
|
|
//initialize header
|
|
p->pageType = DATA_PAGE;
|
|
|
|
//we're the last page for now.
|
|
*is_another_page_ptr(p) = 0;
|
|
|
|
//write 0 to first data size
|
|
*length_at_offset_ptr(p, write_offset_) = 0;
|
|
|
|
//set the page dirty
|
|
stasis_page_lsn_write(xid_, p, get_lsn(xid_));
|
|
|
|
//release the page
|
|
unlock(p->rwlatch);
|
|
releasePage(p);
|
|
}
|
|
|
|
template <class TUPLE>
|
|
size_t DataPage<TUPLE>::write_bytes(const byte * buf, size_t remaining) {
|
|
recordid chunk = calc_chunk_from_offset(write_offset_);
|
|
if(chunk.size > remaining) {
|
|
chunk.size = remaining;
|
|
}
|
|
if(chunk.page >= first_page_ + page_count_) {
|
|
chunk.size = 0; // no space (should not happen)
|
|
} else {
|
|
Page *p = loadPage(xid_, chunk.page);
|
|
memcpy(data_at_offset_ptr(p, chunk.slot), buf, chunk.size);
|
|
writelock(p->rwlatch,0);
|
|
stasis_page_lsn_write(xid_, p, get_lsn(xid_));
|
|
unlock(p->rwlatch);
|
|
releasePage(p);
|
|
write_offset_ += chunk.size;
|
|
}
|
|
return chunk.size;
|
|
}
|
|
template <class TUPLE>
|
|
size_t DataPage<TUPLE>::read_bytes(byte * buf, off_t offset, size_t remaining) {
|
|
recordid chunk = calc_chunk_from_offset(offset);
|
|
if(chunk.size > remaining) {
|
|
chunk.size = remaining;
|
|
}
|
|
if(chunk.page >= first_page_ + page_count_) {
|
|
chunk.size = 0; // eof
|
|
} else {
|
|
Page *p = loadPage(xid_, chunk.page);
|
|
assert(p->pageType == DATA_PAGE);
|
|
if((chunk.page + 1 == page_count_ + first_page_)
|
|
&& (*is_another_page_ptr(p))) {
|
|
page_count_++;
|
|
}
|
|
memcpy(buf, data_at_offset_ptr(p, chunk.slot), chunk.size);
|
|
releasePage(p);
|
|
}
|
|
return chunk.size;
|
|
}
|
|
|
|
template <class TUPLE>
|
|
bool DataPage<TUPLE>::initialize_next_page() {
|
|
recordid rid = calc_chunk_from_offset(write_offset_);
|
|
assert(rid.slot == 0);
|
|
DEBUG("\t\t%lld\n", (long long)rid.page);
|
|
|
|
if(rid.page >= first_page_ + page_count_) {
|
|
assert(rid.page == first_page_ + page_count_);
|
|
if(alloc_->grow_extent(1)) {
|
|
page_count_++;
|
|
} else {
|
|
return false; // The region is full
|
|
}
|
|
} else {
|
|
abort();
|
|
}
|
|
|
|
Page *p = loadPage(xid_, rid.page-1);
|
|
*is_another_page_ptr(p) = (rid.page-1 == first_page_) ? 2 : 1;
|
|
writelock(p->rwlatch, 0);
|
|
stasis_page_lsn_write(xid_, p, get_lsn(xid_));
|
|
unlock(p->rwlatch);
|
|
releasePage(p);
|
|
|
|
|
|
// XXX this is repeated in initialize()!
|
|
#ifdef CHECK_FOR_SCRIBBLING
|
|
p = loadPage(xid_, rid.page);
|
|
if(*stasis_page_type_ptr(p) == DATA_PAGE) {
|
|
printf("Collision on page %lld\n", (long long)rid.page); fflush(stdout);
|
|
assert(*stasis_page_type_ptr(p) != DATA_PAGE); // XXX DO NOT COMMIT THIS LINE
|
|
}
|
|
#else
|
|
p = loadUninitializedPage(xid_, rid.page);
|
|
#endif
|
|
DEBUG("\t\t\t\t%lld\n", (long long)rid.page);
|
|
|
|
p->pageType = DATA_PAGE;
|
|
*is_another_page_ptr(p) = 0;
|
|
writelock(p->rwlatch, 0); //XXX this is pretty obnoxious. Perhaps stasis shouldn't check for the latch
|
|
stasis_page_lsn_write(xid_, p, get_lsn(xid_));
|
|
unlock(p->rwlatch);
|
|
releasePage(p);
|
|
return true;
|
|
}
|
|
|
|
template <class TUPLE>
|
|
bool DataPage<TUPLE>::write_data(const byte * buf, size_t len, bool init_next) {
|
|
bool first = true;
|
|
while(1) {
|
|
assert(len > 0);
|
|
size_t written = write_bytes(buf, len);
|
|
if(written == 0) {
|
|
return false; // fail
|
|
}
|
|
if(written == len) {
|
|
return true; // success
|
|
}
|
|
if(len > PAGE_SIZE && ! first) {
|
|
assert(written > 4000);
|
|
}
|
|
buf += written;
|
|
len -= written;
|
|
if(init_next) {
|
|
if(!initialize_next_page()) {
|
|
return false; // fail
|
|
}
|
|
}
|
|
first = false;
|
|
}
|
|
}
|
|
template <class TUPLE>
|
|
bool DataPage<TUPLE>::read_data(byte * buf, off_t offset, size_t len) {
|
|
while(1) {
|
|
assert(len > 0);
|
|
size_t read_count = read_bytes(buf, offset, len);
|
|
if(read_count == 0) {
|
|
return false; // fail
|
|
}
|
|
if(read_count == len) {
|
|
return true; // success
|
|
}
|
|
buf += read_count;
|
|
offset += read_count;
|
|
len -= read_count;
|
|
}
|
|
}
|
|
template <class TUPLE>
|
|
bool DataPage<TUPLE>::append(TUPLE const * dat)
|
|
{
|
|
// Don't append record to already-full datapage. The record could push us over the page limit, but that's OK.
|
|
if(write_offset_ > (initial_page_count_ * PAGE_SIZE)) { return false; }
|
|
|
|
byte * buf = dat->to_bytes(); // TODO could be more efficient; this does a malloc and memcpy. The alternative couples us more strongly to datapage, but simplifies datapage.
|
|
len_t dat_len = dat->byte_length();
|
|
|
|
bool succ = write_data((const byte*)&dat_len, sizeof(dat_len));
|
|
if(succ) {
|
|
succ = write_data(buf, dat_len);
|
|
}
|
|
|
|
free(buf);
|
|
|
|
return succ;
|
|
}
|
|
|
|
template <class TUPLE>
|
|
bool DataPage<TUPLE>::recordRead(typename TUPLE::key_t key, size_t keySize, TUPLE ** buf)
|
|
{
|
|
RecordIterator itr(this);
|
|
|
|
int match = -1;
|
|
while((*buf=itr.getnext()) != 0)
|
|
{
|
|
match = TUPLE::compare((*buf)->key(), (*buf)->keylen(), key, keySize);
|
|
|
|
if(match<0) //keep searching
|
|
{
|
|
datatuple::freetuple(*buf);
|
|
*buf=0;
|
|
}
|
|
else if(match==0) //found
|
|
{
|
|
return true;
|
|
}
|
|
else // match > 0, then does not exist
|
|
{
|
|
datatuple::freetuple(*buf);
|
|
*buf = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////
|
|
//RECORD ITERATOR
|
|
///////////////////////////////////////////////////////////////
|
|
|
|
|
|
template <class TUPLE>
|
|
TUPLE* DataPage<TUPLE>::RecordIterator::getnext()
|
|
{
|
|
len_t len;
|
|
bool succ;
|
|
|
|
succ = dp->read_data((byte*)&len, read_offset_, sizeof(len));
|
|
if((!succ) || (len == 0)) { return NULL; }
|
|
read_offset_ += sizeof(len);
|
|
|
|
byte * buf = (byte*)malloc(len);
|
|
|
|
succ = dp->read_data(buf, read_offset_, len);
|
|
|
|
if(!succ) { read_offset_ -= sizeof(len); free(buf); return NULL; }
|
|
|
|
read_offset_ += len;
|
|
|
|
TUPLE *ret = TUPLE::from_bytes(buf);
|
|
|
|
free(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*template <class TUPLE>
|
|
void DataPage<TUPLE>::RecordIterator::advance(int xid, int count)
|
|
{
|
|
len_t len;
|
|
bool succ;
|
|
for(int i = 0; i < count; i++) {
|
|
succ = dp->read_data(xid, (byte*)&len, read_offset_, sizeof(len));
|
|
if((!succ) || (len == 0)) { return; }
|
|
read_offset_ += sizeof(len);
|
|
read_offset_ += len;
|
|
}
|
|
}*/
|