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qubole / rubix

Cache File System optimized for columnar formats and object stores
Apache License 2.0
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Available cache space is computed before cache directories are cleaned up during startup #454

Closed sopel39 closed 4 years ago

sopel39 commented 4 years ago

See BookKeeper#BookKeeper(org.apache.hadoop.conf.Configuration, com.qubole.rubix.common.metrics.BookKeeperMetrics, com.google.common.base.Ticker). Inside there is,

    initializeCache(conf, ticker);
    cleanupOldCacheFiles(conf);

However, initializeCache uses java.io.File#getUsableSpace to compute cache size. Therefore when node is restarted with let's say 80% cache partition occupied before, Rubix will use at most only 20% of remaining space.

Should these method calls be revered?

shubhamtagra commented 4 years ago

Yes, this needs to be fixed.

harmandeeps commented 4 years ago

Fixed in #455. Closing this issue. Thanks!

sopel39 commented 4 years ago

Will you create PR to PrestoSQL once Rubix is released?

harmandeeps commented 4 years ago

@sopel39 : yeah, I will create the PR.