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72a5a4f1d5
Test galera_sr_ddl_master would sometimes fail due to leftover
streaming replication fragments. Rollbacker thread would attempt to
open streaming_log table to remove the fragments, but would fail in
check_stack_overrun(). Ultimately the check_stack_overrun() failure
was caused by rollbacker missing to switch the victim's THD thread
stack to rollbacker's thread stack.
Also in this patch:
- Remove duplicate functionality in rollbacker helper functions,
and extract rollbacker fragment removal into function
wsrep_remove_streaming_fragments()
- Reuse open_for_write() in wsrep_schema::remove_fragments
- Partially revert changes to galera_sr_ddl_master test from
commit 44a11a7c08. Removed unnecessary
wait condition and isolation level setting