Wellington Chevreuil created HBASE-23620:
--------------------------------------------
Summary: KeyPrefixRegionSplitPolicy may cause split to fail when
specified prefix length is short enough that resulting split point ends up with
same value of the parent start key.
Key: HBASE-23620
URL: https://issues.apache.org/jira/browse/HBASE-23620
Project: HBase
Issue Type: Bug
Reporter: Wellington Chevreuil
Assignee: Wellington Chevreuil
This was found by [~rmaruthiyodan] while analysing a problem reported by one of
our customers. In this specific case, customer application was defined a prefix
length of four, and row key value range was such that the four bytes prefix was
too short to fit in one single region, causing splits to fail. Quoting
[~rmaruthiyodan] findings:
{noformat}
2019-12-18 00:25:38,469 INFO
[regionserver/regionserver1:17020-splits-1576627813051]
regionserver.HRegionServer: TRANSITION FAILED server {
host_name: "regionserver1.customer.com"
port: 17020
start_code: 1576627748865
}
transition {
transition_code: READY_TO_SPLIT
region_info {
region_id: 1560309299563
table_name
{ namespace: "default" qualifier: "mycustomertable" }
start_key: "abcd"
end_key: "i"
offline: false
split: false
replica_id: 0
}
region_info {
region_id: 1576628738437
table_name
{ namespace: "default" qualifier: "mycustomertable" }
start_key: "abcd"
end_key: "abcd"
offline: false
split: false
replica_id: 0
}
region_info {
region_id: 1576628738437
table_name
{ namespace: "default" qualifier: "mycustomertable" }
start_key: "abcd"
end_key: "i"
offline: false
split: false
replica_id: 0
}
}
: Failed transition Split row is equal to startkey: abcd
2019-12-18 00:25:38,469 ERROR
[regionserver/regionserver1:17020-splits-1576627813051]
regionserver.SplitRequest: Unable to ask master to split
mycustomertable,abcd,1560309299563.ff6bd99e3a9a6927c6858e3c520b0367.
{noformat}
I'm proposing an initial PR that double checks if the resulting split point sub
array is same as the start key, then increment the length of the sub array.
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