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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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1
versioning/BRM/mastersegmenttable.cpp
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@ -138,6 +138,7 @@ MasterSegmentTable::MasterSegmentTable()
RWLockKeys[2] = fShmKeys.KEYRANGE_VBBM_BASE;
RWLockKeys[3] = fShmKeys.KEYRANGE_VSS_BASE;
RWLockKeys[4] = fShmKeys.KEYRANGE_CL_BASE;
RWLockKeys[5] = fShmKeys.KEYRANGE_EXTENTMAP_INDEX_BASE;
try
{