Unlinking Parallel Hash Join inner batch files sooner

From: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
To: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Unlinking Parallel Hash Join inner batch files sooner
Date: 2023-05-10 03:11:20
Message-ID: CA+hUKG+RGdvhAdVu5_LH3Ksee+kW-XkTP_nMxBL+Rmgp3Tjb_w@mail.gmail.com
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Hi,

One complaint about PHJ is that it can, in rare cases, use a
surprising amount of temporary disk space where non-parallel HJ would
not. When it decides that it needs to double the number of batches to
try to fit each inner batch into memory, and then again and again
depending on your level of bad luck, it leaves behind all the earlier
generations of inner batch files to be cleaned up at the end of the
query. That's stupid. Here's a patch to unlink them sooner, as a
small improvement.

The reason I didn't do this earlier is that sharedtuplestore.c
continues the pre-existing tradition where each parallel process
counts what it writes against its own temp_file_limit. At the time I
thought I'd need to have one process unlink all the files, but if a
process were to unlink files that it didn't create, that accounting
system would break. Without some new kind of shared temp_file_limit
mechanism that doesn't currently exist, per-process counters could go
negative, creating free money. In the attached patch, I realised
something that I'd missed before: there is a safe point for each
backend to unlink just the files that it created, and there is no way
for a process that created files not to reach that point.

Here's an example query that tries 8, 16 and then 32 batches on my
machine, because reltuples is clobbered with a bogus value.
Pathological cases can try many more rounds than that, but 3 is enough
to demonstrate. Using truss and shell tricks I spat out the list of
create and unlink operations from master and the attached draft/POC
patch. See below.

set work_mem = '1MB';
CREATE TABLE t (i int);
INSERT INTO t SELECT generate_series(1, 1000000);
ANALYZE t;
UPDATE pg_class SET reltuples = reltuples / 4 WHERE relname = 't';
EXPLAIN ANALYZE SELECT COUNT(*) FROM t t1 JOIN t t2 USING (i);

This code is also exercised by the existing "bad" case in join_hash.sql.

This is the second of two experimental patches investigating increased
resource usage in PHJ compared to HJ based on user complaints, this
one being per-batch temp files, and the other[1] being per-batch
buffer memory.

[1] https://www.postgresql.org/message-id/flat/CA%2BhUKGKCnU9NjFfzO219V-YeyWr8mZe4JRrf%3Dx_uv6qsePBcOw%40mail.gmail.com

=====

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99861: unlink o3of32.p1.0
99861: unlink i24of32.p0.0
99861: unlink o20of32.p0.0
99861: unlink o5of32.p2.0
99861: unlink o20of32.p1.0
99861: unlink i24of32.p1.0
99861: unlink o3of32.p0.0
99861: unlink o30of32.p1.0
99861: unlink i4of8.p2.0
99861: unlink i14of16.p2.0
99861: unlink o11of32.p2.0
99861: unlink i15of32.p2.0
99861: unlink o18of32.p0.0
99861: unlink i2of16.p1.0
99861: unlink i12of16.p0.0
99861: unlink o17of32.p0.0
99861: unlink i3of32.p1.0
99861: unlink i13of32.p0.0
99861: unlink i25of32.p2.0
99861: unlink i1of8.p0.0
99861: unlink o4of32.p1.0
99861: unlink i5of8.p0.0
99861: unlink o21of32.p2.0
99861: unlink i23of32.p0.0
99861: unlink o28of32.p0.0
99861: unlink o27of32.p0.0
99861: unlink i4of32.p0.0
99861: unlink i14of32.p1.0
99861: unlink i5of16.p0.0
99861: unlink o31of32.p2.0
99861: unlink o10of32.p1.0
99861: unlink i15of16.p1.0
99861: unlink i2of32.p2.0
99861: unlink i3of16.p2.0

Patched:

93662: create i3of8.p0.0
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93662: create i1of16.p0.0
93663: create i9of16.p2.0
93663: create i10of16.p2.0
93664: create i10of16.p1.0
93663: create i2of16.p2.0
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93662: create i2of16.p0.0
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93663: create i11of16.p2.0
93663: create i3of16.p2.0
93664: create i3of16.p1.0
93664: create i11of16.p1.0
93662: create i3of16.p0.0
93662: create i11of16.p0.0
93662: create i12of16.p0.0
93664: create i12of16.p1.0
93663: create i12of16.p2.0
93664: create i4of16.p1.0
93662: create i4of16.p0.0
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93663: create i5of16.p2.0
93662: create i5of16.p0.0
93664: create i13of16.p1.0
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93663: create i13of16.p2.0
93664: create i6of16.p1.0
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93663: create i6of16.p2.0
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93662: create i14of16.p0.0
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93663: create i15of16.p2.0
93662: create i15of16.p0.0
93663: create i7of16.p2.0
93664: create i15of16.p1.0
93664: create i7of16.p1.0
93664: unlink i1of8.p1.0
93663: unlink i1of8.p2.0
93662: unlink i1of8.p0.0
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93663: unlink i2of8.p2.0
93662: unlink i2of8.p0.0
93664: unlink i3of8.p1.0
93663: unlink i3of8.p2.0
93664: unlink i4of8.p1.0
93662: unlink i3of8.p0.0
93664: unlink i5of8.p1.0
93663: unlink i4of8.p2.0
93662: unlink i4of8.p0.0
93664: unlink i6of8.p1.0
93663: unlink i5of8.p2.0
93664: unlink i7of8.p1.0
93662: unlink i5of8.p0.0
93663: unlink i6of8.p2.0
93662: unlink i6of8.p0.0
93663: unlink i7of8.p2.0
93662: unlink i7of8.p0.0
93664: create i16of32.p1.0
93663: create i16of32.p2.0
93662: create i16of32.p0.0
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93662: create i1of32.p0.0
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93663: create i2of32.p2.0
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93662: create i19of32.p0.0
93664: create i19of32.p1.0
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93663: create i4of32.p2.0
93663: create i20of32.p2.0
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93662: create i20of32.p0.0
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93664: create i21of32.p1.0
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93662: create i5of32.p0.0
93664: create i22of32.p1.0
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93662: create i22of32.p0.0
93662: create i6of32.p0.0
93664: create i7of32.p1.0
93664: create i23of32.p1.0
93663: create i7of32.p2.0
93662: create i7of32.p0.0
93663: create i23of32.p2.0
93662: create i23of32.p0.0
93664: create i24of32.p1.0
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93663: create i8of32.p2.0
93662: create i8of32.p0.0
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93662: create i9of32.p0.0
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93663: create i28of32.p2.0
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93663: create i12of32.p2.0
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93662: create i28of32.p0.0
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93664: create i29of32.p1.0
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93663: create i13of32.p2.0
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93664: create i31of32.p1.0
93663: create i31of32.p2.0
93664: create i15of32.p1.0
93663: create i15of32.p2.0
93662: create i31of32.p0.0
93662: create i15of32.p0.0
93664: unlink i1of16.p1.0
93663: unlink i1of16.p2.0
93662: unlink i1of16.p0.0
93664: unlink i2of16.p1.0
93663: unlink i2of16.p2.0
93664: unlink i3of16.p1.0
93662: unlink i2of16.p0.0
93663: unlink i3of16.p2.0
93664: unlink i4of16.p1.0
93662: unlink i3of16.p0.0
93663: unlink i4of16.p2.0
93664: unlink i5of16.p1.0
93663: unlink i5of16.p2.0
93664: unlink i6of16.p1.0
93663: unlink i6of16.p2.0
93662: unlink i4of16.p0.0
93664: unlink i7of16.p1.0
93663: unlink i7of16.p2.0
93662: unlink i5of16.p0.0
93664: unlink i8of16.p1.0
93663: unlink i8of16.p2.0
93664: unlink i9of16.p1.0
93662: unlink i6of16.p0.0
93663: unlink i9of16.p2.0
93664: unlink i10of16.p1.0
93662: unlink i7of16.p0.0
93663: unlink i10of16.p2.0
93664: unlink i11of16.p1.0
93663: unlink i11of16.p2.0
93664: unlink i12of16.p1.0
93662: unlink i8of16.p0.0
93664: unlink i13of16.p1.0
93663: unlink i12of16.p2.0
93662: unlink i9of16.p0.0
93664: unlink i14of16.p1.0
93663: unlink i13of16.p2.0
93662: unlink i10of16.p0.0
93664: unlink i15of16.p1.0
93663: unlink i14of16.p2.0
93662: unlink i11of16.p0.0
93663: unlink i15of16.p2.0
93662: unlink i12of16.p0.0
93662: unlink i13of16.p0.0
93662: unlink i14of16.p0.0
93662: unlink i15of16.p0.0
93664: create o19of32.p1.0
93663: create o19of32.p2.0
93662: create o23of32.p0.0
93664: create o30of32.p1.0
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93662: create o26of32.p0.0
93664: create o28of32.p1.0
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93663: create o10of32.p2.0
93664: create o24of32.p1.0
93662: create o22of32.p0.0
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93662: create o12of32.p0.0
93664: create o31of32.p1.0
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93662: create o29of32.p0.0
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93662: create o8of32.p0.0
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93663: create o16of32.p2.0
93662: create o15of32.p0.0
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93662: create o2of32.p0.0
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93662: unlink i9of32.p0.0
93662: unlink i6of32.p0.0
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93662: unlink i21of32.p2.0
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93662: unlink o3of32.p0.0
93662: unlink i13of32.p2.0
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Attachment Content-Type Size
0001-Unlink-PHJ-temporary-files-proactively-when-repartit.patch text/x-patch 4.0 KB

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