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From: Vladimir Davydov <vdavydov.dev@gmail.com>
To: tarantool-patches@freelists.org
Subject: Re: [PATCH 3/9] vinyl: use uncompressed run size for range split/coalesce/compaction
Date: Mon, 21 Jan 2019 12:42:13 +0300	[thread overview]
Message-ID: <20190121094213.yzfawcs7mgkqxi3e@esperanza> (raw)
In-Reply-To: <fff9b3eddaeeb73ae19c2ff277b1ec49052bc030.1548017258.git.vdavydov.dev@gmail.com>

On Mon, Jan 21, 2019 at 12:17:02AM +0300, Vladimir Davydov wrote:
> Historically, when considering splitting or coalescing a range or
> updating compaction priority, we use sizes of compressed runs (see
> bytes_compressed). This makes the algorithms dependent on whether
> compression is used or not and how effective it is, which is weird,
> because compression is a way of storing data on disk - it shouldn't
> affect the way data is partitioned. E.g. if we turned off compression
> at the first LSM tree level, which would make sense, because it's
> relatively small, we would affect the compaction algorithm because
> of this.
> 
> That said, let's use uncompressed run sizes when considering range
> tree transformations.

This results in occasional failures of vinyl/deferred_delete.test.lua.
I amended the patch on the branch to fix this. Here's the diff:

diff --git a/test/vinyl/deferred_delete.result b/test/vinyl/deferred_delete.result
index 29945f8d..61f81ce2 100644
--- a/test/vinyl/deferred_delete.result
+++ b/test/vinyl/deferred_delete.result
@@ -668,16 +668,13 @@ test_run:cmd("switch test")
 fiber = require('fiber')
 ---
 ...
-digest = require('digest')
----
-...
 s = box.schema.space.create('test', {engine = 'vinyl'})
 ---
 ...
-pk = s:create_index('pk', {run_count_per_level = 10})
+pk = s:create_index('pk', {run_count_per_level = 10, run_size_ratio = 2})
 ---
 ...
-sk = s:create_index('sk', {run_count_per_level = 10, parts = {2, 'unsigned', 3, 'string'}, unique = false})
+sk = s:create_index('sk', {run_count_per_level = 10, run_size_ratio = 2, parts = {2, 'unsigned', 3, 'string'}, unique = false})
 ---
 ...
 -- Write a run big enough to prevent major compaction from kicking in
@@ -685,13 +682,25 @@ sk = s:create_index('sk', {run_count_per_level = 10, parts = {2, 'unsigned', 3,
 dummy_rows = 100
 ---
 ...
-for i = 1, dummy_rows do s:replace{i + 1000, i + 1000, digest.urandom(100)} end
+pad = string.rep('z', 50 * 1024)
+---
+...
+for i = 1, dummy_rows do s:replace{i + 1000, i + 1000, pad} end
 ---
 ...
 box.snapshot()
 ---
 - ok
 ...
+pk:compact()
+---
+...
+sk:compact()
+---
+...
+while box.stat.vinyl().scheduler.compaction_queue > 0 do fiber.sleep(0.001) end
+---
+...
 pad = string.rep('x', 10 * 1024)
 ---
 ...
diff --git a/test/vinyl/deferred_delete.test.lua b/test/vinyl/deferred_delete.test.lua
index d38802da..93b5b358 100644
--- a/test/vinyl/deferred_delete.test.lua
+++ b/test/vinyl/deferred_delete.test.lua
@@ -252,17 +252,20 @@ test_run:cmd("start server test with args='1048576'")
 test_run:cmd("switch test")
 
 fiber = require('fiber')
-digest = require('digest')
 
 s = box.schema.space.create('test', {engine = 'vinyl'})
-pk = s:create_index('pk', {run_count_per_level = 10})
-sk = s:create_index('sk', {run_count_per_level = 10, parts = {2, 'unsigned', 3, 'string'}, unique = false})
+pk = s:create_index('pk', {run_count_per_level = 10, run_size_ratio = 2})
+sk = s:create_index('sk', {run_count_per_level = 10, run_size_ratio = 2, parts = {2, 'unsigned', 3, 'string'}, unique = false})
 
 -- Write a run big enough to prevent major compaction from kicking in
 -- (run_count_per_level is ignored on the last level - see gh-3657).
 dummy_rows = 100
-for i = 1, dummy_rows do s:replace{i + 1000, i + 1000, digest.urandom(100)} end
+pad = string.rep('z', 50 * 1024)
+for i = 1, dummy_rows do s:replace{i + 1000, i + 1000, pad} end
 box.snapshot()
+pk:compact()
+sk:compact()
+while box.stat.vinyl().scheduler.compaction_queue > 0 do fiber.sleep(0.001) end
 
 pad = string.rep('x', 10 * 1024)
 for i = 1, 120 do s:replace{i, i, pad} end

  reply	other threads:[~2019-01-21  9:42 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-20 21:16 [PATCH 0/9] vinyl: compaction randomization and throttling Vladimir Davydov
2019-01-20 21:17 ` [PATCH 1/9] vinyl: update lsm->range_heap in one go on dump completion Vladimir Davydov
2019-01-24 16:55   ` Vladimir Davydov
2019-02-05 16:37   ` [tarantool-patches] " Konstantin Osipov
2019-01-20 21:17 ` [PATCH 2/9] vinyl: ignore unknown .run, .index and .vylog keys Vladimir Davydov
2019-01-24 16:56   ` Vladimir Davydov
2019-01-20 21:17 ` [PATCH 3/9] vinyl: use uncompressed run size for range split/coalesce/compaction Vladimir Davydov
2019-01-21  9:42   ` Vladimir Davydov [this message]
2019-02-05 16:49     ` [tarantool-patches] " Konstantin Osipov
2019-02-06  8:55       ` Vladimir Davydov
2019-02-06 10:46         ` Konstantin Osipov
2019-02-06 10:55           ` Vladimir Davydov
2019-02-05 16:43   ` Konstantin Osipov
2019-02-06 16:48     ` Vladimir Davydov
2019-01-20 21:17 ` [PATCH 4/9] vinyl: rename lsm->range_heap to max_compaction_priority Vladimir Davydov
2019-01-20 21:17 ` [PATCH 5/9] vinyl: keep track of dumps per compaction for each LSM tree Vladimir Davydov
2019-02-05 16:58   ` [tarantool-patches] " Konstantin Osipov
2019-02-06  9:20     ` Vladimir Davydov
2019-02-06 16:54       ` Vladimir Davydov
2019-01-20 21:17 ` [PATCH 6/9] vinyl: set range size automatically Vladimir Davydov
2019-01-22  9:17   ` Vladimir Davydov
2019-02-05 17:09   ` [tarantool-patches] " Konstantin Osipov
2019-02-06  9:23     ` Vladimir Davydov
2019-02-06 17:04       ` Vladimir Davydov
2019-01-20 21:17 ` [PATCH 7/9] vinyl: randomize range compaction to avoid IO load spikes Vladimir Davydov
2019-01-22 12:54   ` Vladimir Davydov
2019-02-05 17:39     ` [tarantool-patches] " Konstantin Osipov
2019-02-06  8:53       ` Vladimir Davydov
2019-02-06 10:44         ` Konstantin Osipov
2019-02-06 10:52           ` Vladimir Davydov
2019-02-06 11:06             ` Konstantin Osipov
2019-02-06 11:49               ` Vladimir Davydov
2019-02-06 13:43                 ` Konstantin Osipov
2019-02-06 14:00                   ` Vladimir Davydov
2019-02-05 17:14   ` Konstantin Osipov
2019-01-20 21:17 ` [PATCH 8/9] vinyl: introduce quota consumer types Vladimir Davydov
2019-01-20 21:17 ` [PATCH 9/9] vinyl: throttle tx to ensure compaction keeps up with dumps Vladimir Davydov
2019-01-21 14:14   ` Vladimir Davydov
2019-01-22  9:09   ` Vladimir Davydov

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