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stack commented on HBASE-15248: ------------------------------- Matteo noted that we should be clear that we are not trying to write perfectly aligned 4k pages on a device in this issue (hdfs and actual fs are in the way). > One block, one seek: a.k.a BLOCKSIZE 4k should result in 4096 bytes on disk > --------------------------------------------------------------------------- > > Key: HBASE-15248 > URL: https://issues.apache.org/jira/browse/HBASE-15248 > Project: HBase > Issue Type: Sub-task > Components: BucketCache > Reporter: stack > > Chatting w/ a gentleman named Daniel Pol who is messing w/ bucketcache, he > wants blocks to be the size specified in the configuration and no bigger. His > hardware set ups fetches pages of 4k and so a block that has 4k of payload > but has then a header and the header of the next block (which helps figure > whats next when scanning) ends up being 4203 bytes or something, and this > then then translates into two seeks per block fetch. > This issue is about what it would take to stay inside our configured size > boundary writing out blocks. > If not possible, give back better signal on what to do so you could fit > inside a particular constraint. -- This message was sent by Atlassian JIRA (v6.3.4#6332)