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scylladb/utils
Tomasz Grabiec 082342ecad Attach names to allocating sections for better debuggability
Large reserves in allocating_section can cause stalls. We already log
reserve increase, but we don't know which table it belongs to:

  lsa - LSA allocation failure, increasing reserve in section 0x600009f94590 to 128 segments;

Allocating sections used for updating row cache on memtable flush are
notoriously problematic. Each table has its own row_cache, so its own
allocating_section(s). If we attached table name to those sections, we
could identify which table is causing problems. In some issues we
suspected system.raft, but we can't be sure.

This patch allows naming allocating_sections for the purpose of
identifying them in such log messages. I use abstract_formatter for
this purpose to avoid the cost of formatting strings on the hot path
(e.g. index_reader). And also to avoid duplicating strings which are
already stored elsewhere.

Fixes #25799

Closes scylladb/scylladb#27470
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