[jira] [Created] (HBASE-22620) When a cluster open replication,regionserver will not clean the walLog reference on zk due to no data to replicate

["leizhang (JIRA)" <ji...@apache.org>]

leizhang created HBASE-22620:
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             Summary: When a cluster open replication,regionserver will not clean the walLog reference on zk due to no data to replicate
                 Key: HBASE-22620
                 URL: https://issues.apache.org/jira/browse/HBASE-22620
             Project: HBase
          Issue Type: Bug
          Components: Replication
    Affects Versions: 1.4.9, 2.0.3
            Reporter: leizhang


When I open the replication feature on my hbase cluster (20 regionserver nodes), for example, I create a table with 3 regions, which opened on 3 regionservers of 20. Due to no data to replicate in the source cluster ,then the left 17 nodes  accumulate lots of wal references on the zk node "/hbase/replication/rs/\{resionserver}/\{peerId}/"  and will not be cleaned up, which cause lots of wal file on hdfs will not be cleaned up either. When I check my test cluster after about four months, it accumulates about 5w wal files in the oldWal directory on hdfs. The source code shows that only there are data to be replicated, and after some data is replicated in the source endpoint, then it will executed the useless wal file check, and clean their references on zk, and the hdfs useless wal files will be cleaned up normally. So I think do we need other method to trigger the useless wal cleaning job in a replication cluster? May be  in the  replication progress report  schedule task  (ReplicationStatisticsTask.class)



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