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Josh Elser updated HBASE-18133: ------------------------------- Attachment: HBASE-18133.005.patch > Low-latency space quota size reports > ------------------------------------ > > Key: HBASE-18133 > URL: https://issues.apache.org/jira/browse/HBASE-18133 > Project: HBase > Issue Type: Improvement > Reporter: Josh Elser > Assignee: Josh Elser > Priority: Major > Fix For: 3.0.0 > > Attachments: HBASE-18133.001.patch, HBASE-18133.002.patch, > HBASE-18133.003.patch, HBASE-18133.004.patch, HBASE-18133.005.patch > > > Presently space quota enforcement relies on RegionServers sending reports to > the master about each Region that they host. This is done by periodically, > reading the cached size of each HFile in each Region (which was ultimately > computed from HDFS). > This means that the Master is unaware of Region size growth until the the > next time this chore in a RegionServer fires which is a fair amount of > latency (a few minutes, by default). Operations like flushes, compactions, > and bulk-loads are delayed even though the RegionServer is running those > operations locally. > Instead, we can create an API which these operations could invoke that would > automatically update the size of the Region being operated on. For example, a > successful flush can report that the size of a Region increased by the size > of the flush. A compaction can subtract the size of the input files of the > compaction and add in the size of the resulting file. > This de-couples the computation of a Region's size from sending the Region > sizes to the Master, allowing us to send reports more frequently, increasing > the responsiveness of the cluster to size changes. -- This message was sent by Atlassian JIRA (v7.6.3#76005)