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a94eba4dd1
Customer imported large VM from VMWare (> 3 To), import switched to Qcow2 automatically but the process was stuck while building the qcow2 L1/L2 address tables, where the NbdDisk's hasBlock is called for each l2 table entry which iterated over the disk dataMap which contained ~113,528 ranges. This froze the process for more than 18 minutes after which it was either killed or died due to OOM error.
This fix improves the NbdDisk by:
Updating processDatamap to throw on overlapping ranges and merge touching extents.
Override default getBlockIndexesCount with optimized Nbd one.
Improve hasBlock with a built in cursor to improve performance.
Test file added to cover the new function and updated code.