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Code Issues Releases Activity

[Issue #169] improve comments in merge

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This commit is contained in:
Grigory Smolkin 2020-03-02 21:07:09 +03:00
parent ac017dd8da
commit 251e46c2ab
1 changed files with 9 additions and 9 deletions
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18
src/merge.c
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@ -427,13 +427,13 @@ merge_chain(parray *parent_chain, pgBackup *full_backup, pgBackup *dest_backup)
/* for fancy reporting */
time_t end_time;
char pretty_time[20];
/* in-place flags */
/* in-place merge flags */
bool compression_match = false;
bool program_version_match = false;
/* It's redundant to check block checksumms during merge */
skip_block_validation = true;
/* Handle corner cases missing destination backup */
/* Handle corner cases of missing destination backup */
if (dest_backup == NULL &&
full_backup->status == BACKUP_STATUS_MERGED)
goto merge_rename;
@ -740,12 +740,11 @@ merge_delete:
}
/*
* If we crash now, automatic rerun of failed merge will be impossible.
* The user must have to manually change start_time of FULL backup
* to start_time of destination backup:
* PAGE2 DELETED
* PAGE1 DELETED
* FULL MERGED
* If we crash now, automatic rerun of failed merge is still possible:
* The user should start merge with full backup ID as an argument to option '-i'.
*/
merge_rename:
@ -891,7 +890,7 @@ merge_files(void *arg)
*
* Case 2:
* in this case in place merge is possible:
* 0 PAGE; file, size BYTES_INVALID (should not be possible)
* 0 PAGE; file, size 0
* 1 PAGE; file, size 0
* 2 FULL; file, size 100500
*
@ -901,11 +900,11 @@ merge_files(void *arg)
* 1 PAGE; file, size 100501
* 2 FULL; file, size 100500
*
* Case 4:
* Case 4 (good candidate for future optimization):
* in this case in place merge is impossible:
* 0 PAGE; file, size BYTES_INVALID
* 1 PAGE; file, size 100501
* 2 FULL; file, missing
* 2 FULL; file, not exists yet
*/
in_place = true;
@ -1138,6 +1137,7 @@ merge_data_file(parray *parent_chain, pgBackup *full_backup,
if (tmp_file->write_size == 0)
return;
/* sync second temp file to disk */
if (fio_sync(to_fullpath_tmp2, FIO_BACKUP_HOST) != 0)
elog(ERROR, "Cannot sync merge temp file \"%s\": %s",
to_fullpath_tmp2, strerror(errno));
@ -1242,7 +1242,7 @@ merge_non_data_file(parray *parent_chain, pgBackup *full_backup,
backup_non_data_file(tmp_file, NULL, from_fullpath,
to_fullpath_tmp, BACKUP_MODE_FULL, 0, false);
/* TODO: --no-sync support */
/* sync temp file to disk */
if (fio_sync(to_fullpath_tmp, FIO_BACKUP_HOST) != 0)
elog(ERROR, "Cannot sync merge temp file \"%s\": %s",
to_fullpath_tmp, strerror(errno));