ReplicatedMergeTree - cleanup data directory after Zookeeper exceptions#14563
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tavplubix merged 9 commits intoClickHouse:masterfrom Sep 10, 2020
bharatnc:ncb/zk-conn-fail-do-cleanup
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ReplicatedMergeTree - cleanup data directory after Zookeeper exceptions#14563tavplubix merged 9 commits intoClickHouse:masterfrom bharatnc:ncb/zk-conn-fail-do-cleanup
tavplubix merged 9 commits intoClickHouse:masterfrom
bharatnc:ncb/zk-conn-fail-do-cleanup
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It's possible for `getZooKeeper()` to timeout if zookeeper host(s) can't be reached. In such cases `Poco::Exception` is thrown after a connection timeout - refer to `src/Common/ZooKeeper/ZooKeeperImpl.cpp:866` for more info. Side effect of this is that the CreateQuery gets interrupted and it exits. But the data Directories for the tables being created aren't cleaned up. This unclean state will hinder table creation on any retries and will complain that the Directory for table already exists. To achieve a clean state on failed table creations, catch this error if the exception is of type Poco::Exception and call `dropIfEmpty()` method, then proceed throwing the exception. Without this, the Directory for the tables need to be manually deleted before retrying the CreateQuery.
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This adds a integration test that tests if table directory is cleaned up after a ZooKeeper connection failure for ReplicatedMergeTree tables.
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Also addresses #14115 |
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@tavplubix thank you for adding those tests. Should this PR be considered a |
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Ok, let's change the changelog category to "Bug Fix", so it will be backported |
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… after Zookeeper exceptions
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Backport #14563 to 20.6: ReplicatedMergeTree - cleanup data directory after Zookeeper exceptions
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Backport #14563 to 20.8: ReplicatedMergeTree - cleanup data directory after Zookeeper exceptions
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Backport #14563 to 20.9: ReplicatedMergeTree - cleanup data directory after Zookeeper exceptions
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Backport #14563 to 20.7: ReplicatedMergeTree - cleanup data directory after Zookeeper exceptions
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Changelog category (leave one):
Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):
Cleanup data directory after Zookeeper exceptions during CreateQuery for StorageReplicatedMergeTree Engine.
Detailed description / Documentation draft:
It's possible for
getZooKeeper()to timeout if zookeeper host(s) can'tbe reached. In such cases
Poco::Exceptionis thrown after a connectiontimeout - refer to
src/Common/ZooKeeper/ZooKeeperImpl.cpp:866for more info.Side effect of this is that the CreateQuery gets interrupted and it exits.
But the data Directories for the tables being created aren't cleaned up.
This unclean state will hinder table creation on any retries and will
complain that the Directory for table already exists.
To achieve a clean state on failed table creations, catch this error if
the exception is of type Poco::Exception and call
dropIfEmpty()method,then proceed throwing the exception. Without this, the Directory for the
tables need to be manually deleted before retrying the CreateQuery.
This addresses: #14517