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Add retry to migrate_word_counts

This commit is contained in:
Neil Lalonde 2013-12-10 18:10:52 -05:00
parent 763b36baa6
commit 5ed80561ee
1 changed files with 16 additions and 2 deletions
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18
db/migrate/20131210181901_migrate_word_counts.rb
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@ -5,13 +5,27 @@ class MigrateWordCounts < ActiveRecord::Migration
post_ids = execute("SELECT id FROM posts WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
while post_ids.length > 0
execute "UPDATE posts SET word_count = COALESCE(array_length(regexp_split_to_array(raw, ' '),1), 0) WHERE id IN (#{post_ids.join(',')})"
3.times do
begin
execute "UPDATE posts SET word_count = COALESCE(array_length(regexp_split_to_array(raw, ' '),1), 0) WHERE id IN (#{post_ids.join(',')})"
break
rescue PG::Error
# Deadlock. Try again, up to 3 times.
end
end
post_ids = execute("SELECT id FROM posts WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
end
topic_ids = execute("SELECT id FROM topics WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
while topic_ids.length > 0
execute "UPDATE topics SET word_count = COALESCE((SELECT SUM(COALESCE(posts.word_count, 0)) FROM posts WHERE posts.topic_id = topics.id), 0) WHERE topics.id IN (#{topic_ids.join(',')})"
3.times do
begin
execute "UPDATE topics SET word_count = COALESCE((SELECT SUM(COALESCE(posts.word_count, 0)) FROM posts WHERE posts.topic_id = topics.id), 0) WHERE topics.id IN (#{topic_ids.join(',')})"
break
rescue PG::Error
# Deadlock. Try again, up to 3 times.
end
end
topic_ids = execute("SELECT id FROM topics WHERE word_count IS NULL LIMIT 500").map {|r| r['id'].to_i }
end