数据批量导入，导致Hbase region 100G，未进行分裂是什么原因

版本：Hbase 2.0批量往hbase进行数据导入，导致部分region大小超过100G，而集群配置最大是10G，（之前是200G，自动分裂到了100多G）。
具体是什么原因呢？集群基于CDH搭建，没有其他操作，处于空闲状态，负载也比较低，是什么原因导致region没有进行分裂？
并且手动执行分裂提示无法分裂
hbase(main):004:0> split 'tbName'

ERROR: org.apache.hadoop.hbase.DoNotRetryIOException: fc09d55f91ed8831b4316f34b07719c5 NOT splittable

    at org.apache.hadoop.hbase.master.assignment.SplitTableRegionProcedure.checkSplittable(SplitTableRegionProcedure.java:182)
    at org.apache.hadoop.hbase.master.assignment.SplitTableRegionProcedure.<init>(SplitTableRegionProcedure.java:114)
    at org.apache.hadoop.hbase.master.assignment.AssignmentManager.createSplitProcedure(AssignmentManager.java:772)
    at org.apache.hadoop.hbase.master.HMaster$2.run(HMaster.java:1635)
    at org.apache.hadoop.hbase.master.procedure.MasterProcedureUtil.submitProcedure(MasterProcedureUtil.java:131)
    at org.apache.hadoop.hbase.master.HMaster.splitRegion(HMaster.java:1627)
    at org.apache.hadoop.hbase.master.MasterRpcServices.splitRegion(MasterRpcServices.java:774)
    at org.apache.hadoop.hbase.shaded.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java)
    at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:409)
    at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:130)
    at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:324)
    at org.apache.hadoop.hbase.ipc.RpcExecutor$Handler.run(RpcExecutor.java:304)

Split entire table or pass a region to split individual region. With the
second parameter, you can specify an explicit split key for the region.
Examples:

split 'tableName'
split 'namespace:tableName'
split 'regionName' # format: 'tableName,startKey,id'
split 'tableName', 'splitKey'
split 'regionName', 'splitKey'

Took 0.3912 seconds
图片不会上传

fc09d55f91ed8831b4316f34b07719c5 fwqzx011.zh:16030 500 0 180.41 GB 3 0 B 1.0 - -
07c32308a85d7797f18e6011ab5eef01 fwqzx011.zh:16030 500 0 145.27 GB 3 0 B 1.0 - -
1f4bc1398c7e7b951ab081fc6d27f483 fwqzx011.zh:16030 500 0 101.15 GB 1 0 B 1.0 - -
b3a6f416a4ecba0d2fb0f668ee6055f9 fwqzx011.zh:16030 500 0 101.15 GB 1 0 B 1.0 - -
24eb3dbf8ef77a2c4d1e61a17b406faf fwqzx011.zh:16030 500 0 123.58 GB 1 0 B 1.0 - -
6a7d20ea20009c84653914ed884e9052 fwqzx011.zh:16030 500 0 123.58 GB 1 0 B 1.0 - -
8f6cf3b72841476d37f2b2899905b47e fwqml005.zh:16030 0 0 34.08 GB 1 0 B 1.0 - -
7d13f4777eacd30dd12e96b2583087bf fwqml005.zh:16030 0 0 34.08 GB 1 0 B 1.0 - -
4fe76a7e32093161e02764382f5bd10a fwqml005.zh:16030 500 0 8.52 GB 1 0 B 1.0 - -
1bf2254eac114614678b42489ce23799 fwqml005.zh:16030 500 0 8.52 GB 1 0 B 1.0 - -