Limit backups opened #2151
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Limit backups opened #2151
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@ajkr has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator. |
siying
approved these changes
Apr 17, 2017
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@ajkr updated the pull request - view changes - changes since last import |
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@ajkr has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator. |
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This was requested by a customer who wants to proactively monitor whether any valid backups are available. The existing performance was poor because Open() serially reads every small meta-file (one per backup), which was slow on HDFS.
Now we only read the minimum number of meta-files to find
max_valid_backups_to_openvalid backups. The customer mentioned above can just set it to one.