Fix bug 1648322 in 2.4 #293
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…tadir tablespaces to their original directories When copy-back walks files and copies them back to datadir, it is looking for corresponding .isl files as it passing by .ibd file. If .isl file is found, .ibd will be copied to the destination pointed by .isl. It works for copy-back, but it doesn't work for move-back, because we have no control over the order in which files are handled. It can happen that .isl file already moved when we are handling corresponding .ibd file. To fix this, map has been introduced to store association between .ibd files and their destinations. Now when we stumble upon .ibd or .isl file we store destination path for .ibd file as been read from .isl. And when we handle .ibd, we simply lookup the destination from that map.
* 2.3-xb-bug1648322: Bug 1648322: xtrabackup --move-back is not always restoring out-of-datadir tablespaces to their original directories
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