/*
* Try opening the next segment file to read.
*
* This routine is responsible for seeking to the proper read location given
* the logical EOF.
*
* filePathName - name of the segment file to open
* version - AO table format version the file is in.
* logicalEof - snapshot version of the EOF value to use as the read end of
* the segment file.
*/
bool
AppendOnlyStorageRead_TryOpenFile(AppendOnlyStorageRead *storageRead,
char *filePathName,
int version,
int64 logicalEof)
{
File file;
Assert(storageRead != NULL);
Assert(storageRead->isActive);
Assert(filePathName != NULL);
/* UNDONE: Range check logicalEof */
file = AppendOnlyStorageRead_DoOpenFile(storageRead,
filePathName);
if (file < 0)
return false;
AppendOnlyStorageRead_FinishOpenFile(storageRead,
file,
filePathName,
version,
logicalEof);
return true;
}
/*
* Open the next segment file to read.
*
* This routine is responsible for seeking to the proper
* read location given the logical EOF.
*/
void AppendOnlyStorageRead_OpenFile(
AppendOnlyStorageRead *storageRead,
char *filePathName,
/* The name of the segment file to open. */
int64 logicalEof)
/*
* The snapshot version of the EOF
* value to use as the read end of the segment
* file.
*/
{
File file;
Assert(storageRead != NULL);
Assert(storageRead->isActive);
Assert(filePathName != NULL);
/*
* The EOF must be be greater than 0, otherwise we risk transactionally created
* segment files from disappearing if a concurrent write transaction aborts.
*/
if (logicalEof == 0)
ereport(ERROR,
(errcode(ERRCODE_GP_INTERNAL_ERROR),
errmsg("Append-only Storage Read segment file '%s' EOF must be > 0 for relation '%s'",
filePathName,
storageRead->relationName)));
file = AppendOnlyStorageRead_DoOpenFile(
storageRead,
filePathName);
if(file < 0)
{
ereport(ERROR,
(errcode_for_file_access(),
errmsg("Append-Only Storage Read could not open segment file '%s' for relation '%s'",
filePathName,
storageRead->relationName)));
}
AppendOnlyStorageRead_FinishOpenFile(
storageRead,
file,
filePathName,
logicalEof);
}
/*
* Try opening the next segment file to read.
*
* This routine is responsible for seeking to the proper
* read location given the logical EOF.
*/
bool AppendOnlyStorageRead_TryOpenFile(
AppendOnlyStorageRead *storageRead,
char *filePathName,
/* The name of the segment file to open. */
int64 logicalEof)
/*
* The snapshot version of the EOF
* value to use as the read end of the segment
* file.
*/
{
File file;
Assert(storageRead != NULL);
Assert(storageRead->isActive);
Assert(filePathName != NULL);
// UNDONE: Range check logicalEof
file = AppendOnlyStorageRead_DoOpenFile(
storageRead,
filePathName);
if(file < 0)
{
return false;
}
AppendOnlyStorageRead_FinishOpenFile(
storageRead,
file,
filePathName,
logicalEof);
return true;
}
