require empty db keyspace to run hash#184
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smacker merged 4 commits intosrc-d:masterfrom Jan 29, 2019
smacker:require_empty_db_keyspace
Merged
require empty db keyspace to run hash#184smacker merged 4 commits intosrc-d:masterfrom smacker:require_empty_db_keyspace
smacker merged 4 commits intosrc-d:masterfrom
smacker:require_empty_db_keyspace
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carlosms
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Jan 28, 2019
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| def isDBEmpty(session: Session, mode: String): Boolean = { | ||
| var row = session.execute(s"select count(*) from $keyspace.${tables.docFreq} where id='$mode'").one() |
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is select count(*) performance ok to run this before every command? Would it improve if it was select count(*) ... limit 1?
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currently, it's okay because this table can contain only 2 rows max.
but it's a good point and better to update in case we change it. 👍
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ok, I missed that about the table :D
carlosms
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👍, left a small suggestion
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| if (!gemini.isDBEmpty(cassandra, config.mode)) { | ||
| println("Database keyspace is not empty! Hashing may produce wrong results. " + | ||
| "Please choose another keyspace or pass --replace argument") |
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| "Please choose another keyspace or pass --replace argument") | |
| "Please choose another keyspace or pass the --replace option") |
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fixed the first commit with new message
Hashing can't be executed incrementally due to calculation of document frequencies which require full input. this commit checks if hashtables and docfreq tables are empty and gemini exits with error if they are not. it also introduces new flag --replace which would clean up db for current hashing mode. Signed-off-by: Maxim Sukharev <max@smacker.ru>
It allows to pass just `--cassandra` instead of `--cassandra=true` Signed-off-by: Maxim Sukharev <max@smacker.ru>
Signed-off-by: Maxim Sukharev <max@smacker.ru>
se7entyse7en
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Jan 28, 2019
Signed-off-by: Maxim Sukharev <max@smacker.ru>
se7entyse7en
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Jan 28, 2019
smola
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Jan 28, 2019
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Hashing can't be executed incrementally due to calculation of document
frequencies which require full input.
this commit checks if hashtables and docfreq tables are empty and gemini
exits with error if they are not.
it also introduces new flag --replace which would clean up db for
current hashing mode.
There is also separate commit that changes type of cassandra flag to unit.
It allows to pass just
--cassandrainstead of--cassandra=true(for consistency)
Output when db isn't empty: