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MCOL-4912 This patch introduces Extent Map index to improve EM scaleability

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EM scaleability project has two parts: phase1 and phase2.
        This is phase1 that brings EM index to speed up(from O(n) down
        to the speed of boost::unordered_map) EM lookups looking for
        <dbroot, oid, partition> tuple to turn it into LBID,
        e.g. most bulk insertion meta info operations.
        The basis is boost::shared_managed_object where EMIndex is
        stored. Whilst it is not debug-friendly it allows to put a
        nested structs into shmem. EMIndex has 3 tiers. Top down description:
        vector of dbroots, map of oids to partition vectors, partition
        vectors that have EM indices.
        Separate EM methods now queries index before they do EM run.
        EMIndex has a separate shmem file with the fixed id
        MCS-shm-00060001.
This commit is contained in:
Roman Nozdrin
2022-03-30 08:57:05 +00:00
committed by Leonid Fedorov
parent fb3eaabd29
commit 4c26e4f960
25 changed files with 3498 additions and 459 deletions
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77
versioning/BRM/brmshmimpl.h
View File

@@ -30,17 +30,18 @@
//#define NDEBUG
#include <cassert>
#include <boost/interprocess/shared_memory_object.hpp>
#include <boost/interprocess/managed_shared_memory.hpp>
#include <boost/interprocess/mapped_region.hpp>
namespace bi = boost::interprocess;
namespace BRM
{
class BRMShmImpl
class BRMShmImplParent
{
public:
BRMShmImpl(unsigned key, off_t size, bool readOnly = false);
~BRMShmImpl()
{
}
BRMShmImplParent(unsigned key, off_t size, bool readOnly = false);
virtual ~BRMShmImplParent();
inline unsigned key() const
{
@@ -55,23 +56,63 @@ class BRMShmImpl
return fReadOnly;
}
void setReadOnly();
int grow(unsigned newKey, off_t newSize);
int clear(unsigned newKey, off_t newSize);
void swap(BRMShmImpl& rhs);
void destroy();
boost::interprocess::shared_memory_object fShmobj;
boost::interprocess::mapped_region fMapreg;
private:
BRMShmImpl(const BRMShmImpl& rhs);
BRMShmImpl& operator=(const BRMShmImpl& rhs);
virtual void setReadOnly() = 0;
virtual int clear(unsigned newKey, off_t newSize) = 0;
virtual void destroy() = 0;
protected:
unsigned fKey;
off_t fSize;
bool fReadOnly;
};
class BRMShmImpl : public BRMShmImplParent
{
public:
BRMShmImpl(unsigned key, off_t size, bool readOnly = false);
BRMShmImpl(const BRMShmImpl& rhs) = delete;
BRMShmImpl& operator=(const BRMShmImpl& rhs) = delete;
~BRMShmImpl()
{
}
int clear(unsigned newKey, off_t newSize) override;
void destroy() override;
void setReadOnly() override;
int grow(unsigned newKey, off_t newSize);
void swap(BRMShmImpl& rhs);
bi::shared_memory_object fShmobj;
bi::mapped_region fMapreg;
};
class BRMManagedShmImpl : public BRMShmImplParent
{
public:
BRMManagedShmImpl(unsigned key, off_t size, bool readOnly = false);
BRMManagedShmImpl(const BRMManagedShmImpl& rhs) = delete;
BRMManagedShmImpl& operator=(const BRMManagedShmImpl& rhs) = delete;
~BRMManagedShmImpl()
{
delete fShmSegment;
}
int clear(unsigned newKey, off_t newSize) override;
void destroy() override;
void setReadOnly() override;
int grow(off_t newSize);
void remap(const bool readOnly = false);
void swap(BRMManagedShmImpl& rhs);
bi::managed_shared_memory* getManagedSegment()
{
assert(fShmSegment);
return fShmSegment;
}
private:
bi::managed_shared_memory* fShmSegment;
};
} // namespace BRM