[HBASE-15391] Avoid too large "deleted from META" info log

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 2.0.0-alpha-2, 2.0.0
• Hadoop Flags: Reviewed
• Assignee: Shaohui Liu
• Reporter: Shaohui Liu
• Created: 04/Mar/16 05:40
• Updated: 21/Mar/18 22:08
• Resolved: 30/Jun/17 14:58

Description

When deleting a large table in HBase, there will be a large info log in HMaster.

2016-02-29,05:58:45,920 INFO org.apache.hadoop.hbase.catalog.MetaEditor: Deleted [{ENCODED => 4b54572150941cd03f5addfdeab0a754, NAME => 'YCSBTest,,1453186492932.4b54572150941cd03f5addfdeab0a754.', STARTKEY => '', ENDKEY => 'user01'}, {ENCODED => 715e142bcd6a31d7842abf286ef8a5fe, NAME => 'YCSBTest,user01,1453186492933.715e142bcd6a31d7842abf286ef8a5fe.', STARTKEY => 'user01', ENDKEY => 'user02'}, {ENCODED => 5f9cef5714973f13baa63fba29a68d70, NAME => 'YCSBTest,user02,1453186492933.5f9cef5714973f13baa63fba29a68d70.', STARTKEY => 'user02', ENDKEY => 'user03'}, {ENCODED => 86cf3fa4c0a6b911275512c1d4b78533, NAME => 'YCSBTest,user0...

The reason is that MetaTableAccessor will log all regions when deleting them from meta. See, MetaTableAccessor.java#deleteRegions

  public static void deleteRegions(Connection connection,
                                   List<HRegionInfo> regionsInfo, long ts) throws IOException {
    List<Delete> deletes = new ArrayList<Delete>(regionsInfo.size());
    for (HRegionInfo hri: regionsInfo) {
      Delete e = new Delete(hri.getRegionName());
      e.addFamily(getCatalogFamily(), ts);
      deletes.add(e);
    }
    deleteFromMetaTable(connection, deletes);
    LOG.info("Deleted " + regionsInfo);
  }

Just change the info log to debug and add a info log about the number of deleted regions. Others suggestions are welcomed~