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Implement PG epochs to prevent the "version split"

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The "version split" is when:
- A block is written to 1 OSD out of 3, all of them die
- OSDs 2 and 3 come up, the same block is written to both of them
- The remaining OSD comes up. Now all 3 OSDs have the same version of the same object,
  but with different data.
This commit is contained in:
Vitaliy Filippov
2020-07-04 00:55:27 +03:00
parent e680d6c1c3
commit a7929931eb
9 changed files with 126 additions and 40 deletions
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osd_primary_subops.cpp
+1 -2
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@@ -76,7 +76,7 @@ void osd_t::finish_op(osd_op_t *cur_op, int retval)
}
}
void osd_t::submit_primary_subops(int submit_type, int pg_size, const uint64_t* osd_set, osd_op_t *cur_op)
void osd_t::submit_primary_subops(int submit_type, uint64_t op_version, int pg_size, const uint64_t* osd_set, osd_op_t *cur_op)
{
bool w = submit_type == SUBMIT_WRITE;
osd_primary_op_data_t *op_data = cur_op->op_data;
@@ -102,7 +102,6 @@ void osd_t::submit_primary_subops(int submit_type, int pg_size, const uint64_t*
{
zero_read = -1;
}
uint64_t op_version = w ? op_data->fact_ver+1 : (submit_type == SUBMIT_RMW_READ ? UINT64_MAX : op_data->target_ver);
osd_op_t *subops = new osd_op_t[n_subops];
op_data->fact_ver = 0;
op_data->done = op_data->errors = 0;