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103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
#pragma once
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#include "Aliases.h"
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#include "TaskTableAndShard.h"
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namespace DB
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{
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/// Just destination partition of a shard
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/// I don't know what this comment means.
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/// In short, when we discovered what shards contain currently processing partition,
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/// This class describes a partition (name) that is stored on the shard (parent).
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struct ShardPartition
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{
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ShardPartition(TaskShard &parent, String name_quoted_, size_t number_of_splits = 10)
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: task_shard(parent), name(std::move(name_quoted_)) { pieces.reserve(number_of_splits); }
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String getPartitionPath() const;
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String getPartitionPiecePath(size_t current_piece_number) const;
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String getPartitionCleanStartPath() const;
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String getPartitionPieceCleanStartPath(size_t current_piece_number) const;
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String getCommonPartitionIsDirtyPath() const;
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String getCommonPartitionIsCleanedPath() const;
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String getPartitionActiveWorkersPath() const;
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String getActiveWorkerPath() const;
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String getPartitionShardsPath() const;
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String getShardStatusPath() const;
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/// What partition pieces are present in current shard.
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/// FYI: Piece is a part of partition which has modulo equals to concrete constant (less than number_of_splits obliously)
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/// For example SELECT ... from ... WHERE partition=current_partition AND cityHash64(*) == const;
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/// Absent pieces have field is_absent_piece equals to true.
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PartitionPieces pieces;
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TaskShard & task_shard;
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String name;
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};
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inline String ShardPartition::getPartitionCleanStartPath() const
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{
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return getPartitionPath() + "/clean_start";
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}
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inline String ShardPartition::getPartitionPieceCleanStartPath(size_t current_piece_number) const
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{
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assert(current_piece_number < task_shard.task_table.number_of_splits);
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return getPartitionPiecePath(current_piece_number) + "/clean_start";
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}
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inline String ShardPartition::getPartitionPath() const
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{
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return task_shard.task_table.getPartitionPath(name);
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}
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inline String ShardPartition::getPartitionPiecePath(size_t current_piece_number) const
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{
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assert(current_piece_number < task_shard.task_table.number_of_splits);
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return task_shard.task_table.getPartitionPiecePath(name, current_piece_number);
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}
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inline String ShardPartition::getShardStatusPath() const
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{
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// schema: /<root...>/tables/<table>/<partition>/shards/<shard>
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// e.g. /root/table_test.hits/201701/shards/1
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return getPartitionShardsPath() + "/" + toString(task_shard.numberInCluster());
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}
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inline String ShardPartition::getPartitionShardsPath() const
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{
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return getPartitionPath() + "/shards";
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}
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inline String ShardPartition::getPartitionActiveWorkersPath() const
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{
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return getPartitionPath() + "/partition_active_workers";
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}
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inline String ShardPartition::getActiveWorkerPath() const
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{
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return getPartitionActiveWorkersPath() + "/" + toString(task_shard.numberInCluster());
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}
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inline String ShardPartition::getCommonPartitionIsDirtyPath() const
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{
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return getPartitionPath() + "/is_dirty";
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}
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inline String ShardPartition::getCommonPartitionIsCleanedPath() const
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{
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return getCommonPartitionIsDirtyPath() + "/cleaned";
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}
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}
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