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Merge pull request #16409 from azat/drop-distributed-fix

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Fix DROP TABLE for Distributed (racy with INSERT)
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tavplubix 2020-10-28 14:10:32 +03:00 committed by GitHub
commit cd70dc82cd
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1 changed files with 12 additions and 6 deletions
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18
src/Storages/StorageDistributed.cpp
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@ -80,7 +80,6 @@ namespace ErrorCodes
extern const int TYPE_MISMATCH;
extern const int TOO_MANY_ROWS;
extern const int UNABLE_TO_SKIP_UNUSED_SHARDS;
extern const int LOGICAL_ERROR;
}
namespace ActionLocks
@ -600,15 +599,22 @@ void StorageDistributed::shutdown()
monitors_blocker.cancelForever();
std::lock_guard lock(cluster_nodes_mutex);
LOG_DEBUG(log, "Joining background threads for async INSERT");
cluster_nodes_data.clear();
LOG_DEBUG(log, "Background threads for async INSERT joined");
}
void StorageDistributed::drop()
{
// shutdown() should be already called
// and by the same reason we cannot use truncate() here, since
// cluster_nodes_data already cleaned
if (!cluster_nodes_data.empty())
throw Exception("drop called before shutdown", ErrorCodes::LOGICAL_ERROR);
// Some INSERT in-between shutdown() and drop() can call
// requireDirectoryMonitor() again, so call shutdown() to clear them, but
// when the drop() (this function) executed none of INSERT is allowed in
// parallel.
//
// And second time shutdown() should be fast, since none of
// DirectoryMonitor should do anything, because ActionBlocker is canceled
// (in shutdown()).
shutdown();
// Distributed table w/o sharding_key does not allows INSERTs
if (relative_data_path.empty())