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Hudson commented on HBASE-22285: -------------------------------- Results for branch master [build #1594 on builds.a.o|https://builds.apache.org/job/HBase%20Nightly/job/master/1594/]: (x) *{color:red}-1 overall{color}* ---- details (if available): (/) {color:green}+1 general checks{color} -- For more information [see general report|https://builds.apache.org/job/HBase%20Nightly/job/master/1594//General_Nightly_Build_Report/] (/) {color:green}+1 jdk8 hadoop2 checks{color} -- For more information [see jdk8 (hadoop2) report|https://builds.apache.org/job/HBase%20Nightly/job/master/1594//JDK8_Nightly_Build_Report_(Hadoop2)/] (x) {color:red}-1 jdk8 hadoop3 checks{color} -- For more information [see jdk8 (hadoop3) report|https://builds.apache.org/job/HBase%20Nightly/job/master/1594//JDK8_Nightly_Build_Report_(Hadoop3)/] (/) {color:green}+1 source release artifact{color} -- See build output for details. (/) {color:green}+1 client integration test{color} > A normalizer which merges very small size regions with adjacent > regions.(MergeToNormalize) > ------------------------------------------------------------------------------------------ > > Key: HBASE-22285 > URL: https://issues.apache.org/jira/browse/HBASE-22285 > Project: HBase > Issue Type: New Feature > Components: regionserver > Reporter: Aman Poonia > Assignee: Aman Poonia > Priority: Minor > Fix For: 3.0.0 > > > There are scenarios where we have seen around 5% of total regions with a size > of 0 bytes and another 5-6 % regions with size in a few bytes. These kinds of > regions increase with time considering we have TTL over the rows. > After exploring the option of RegionNormalizer and doing some quick runs we > found that that is not suitable considering it also splits the regions and > merges to normalize. What we really want is to split as per Split policy and > merge very small regions with adjacent regions to make sure we reduce 0-byte > regions. > We can plugin this normalizer using the property > "hbase.master.normalizer.class" -- This message was sent by Atlassian Jira (v8.3.4#803005)