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Hudson commented on HBASE-27999: -------------------------------- Results for branch branch-2.6 [build #3 on builds.a.o|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/]: (x) *{color:red}-1 overall{color}* ---- details (if available): (/) {color:green}+1 general checks{color} -- For more information [see general report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/General_20Nightly_20Build_20Report/] (x) {color:red}-1 jdk8 hadoop2 checks{color} -- For more information [see jdk8 (hadoop2) report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/JDK8_20Nightly_20Build_20Report_20_28Hadoop2_29/] (x) {color:red}-1 jdk8 hadoop3 checks{color} -- For more information [see jdk8 (hadoop3) report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/JDK8_20Nightly_20Build_20Report_20_28Hadoop3_29/] (x) {color:red}-1 jdk11 hadoop3 checks{color} -- For more information [see jdk11 report|https://ci-hbase.apache.org/job/HBase%20Nightly/job/branch-2.6/3/JDK11_20Nightly_20Build_20Report_20_28Hadoop3_29/] (/) {color:green}+1 source release artifact{color} -- See build output for details. (/) {color:green}+1 client integration test{color} > Implement cache aware load balancer > ----------------------------------- > > Key: HBASE-27999 > URL: https://issues.apache.org/jira/browse/HBASE-27999 > Project: HBase > Issue Type: Sub-task > Components: Balancer > Reporter: Rahul Agarkar > Assignee: Rahul Agarkar > Priority: Major > Fix For: 3.0.0-beta-1, 4.0.0-alpha-1 > > > HBase uses ephemeral cache to cache the blocks by reading them from the slow > storages and storing them to the bucket cache. This cache is warmed up > everytime a region server is started. Depending on the data size and the > configured cache size, the cache warm up can take anywhere between a few > minutes to few hours. Doing this everytime the region server starts can be a > very expensive process. To eliminate this, HBASE-27313 implemented the cache > persistence feature where the region servers periodically persist the blocks > cached in the bucket cache. This persisted information is then used to > resurrect the cache in the event of a region server restart because of normal > restart or crash. > This feature aims at enhancing this capability of HBase to enable the > balancer implementation considers the cache allocation of each region on > region servers when calculating a new assignment plan and uses the > region/region server cache allocation info reported by region servers which > takes into account to calculate the percentage of HFiles cached for each > region on the hosting server, and then use that as another factor when > deciding on an optimal, new assignment plan. > > A design document describing the balancer can be found at > https://docs.google.com/document/d/1A8-eVeRhZjwL0hzFw9wmXl8cGP4BFomSlohX2QcaFg4/edit?usp=sharing -- This message was sent by Atlassian Jira (v8.20.10#820010)