Jonathan Hsieh created HBASE-10319:
--------------------------------------
Summary: HLog should roll periodically to allow DN decommission to
eventually complete.
Key: HBASE-10319
URL: https://issues.apache.org/jira/browse/HBASE-10319
Project: HBase
Issue Type: Bug
Reporter: Jonathan Hsieh
We encountered a situation where we had an esseitially read only table and
attempted to do a clean HDFS DN decommission. DN's cannot decomission if there
are open blocks being written to currently on it. Because the hbase Hlog file
was open, had some data (hlog header), the DN could not decommission itself.
Since no new data is ever written, the existing periodic check is not activated.
After discussing with [~atm], it seems that although an hdfs semantics change
would be ideal (e.g. hbase doesn't have to be aware of hdfs decommission and
the client would roll over) this would take much more effort than having hbase
periodically force a log roll. This would enable the hdfs dn con complete.
--
This message was sent by Atlassian JIRA
(v6.1.5#6160)
