HBase Block locality always 0

[娄帅]

Hi, all,

I am maintaining an hbase 0.96.0 cluster, but from the web ui of HBase
regionserver,
i saw Block locality is 0 for all regionserver.

Datanode on l-hbase[26-31].data.cn8 and regionserver on
l-hbase[25-31].data.cn8,

Any idea?