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https://issues.apache.org/jira/browse/HBASE-22620?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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leizhang resolved HBASE-22620.
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Resolution: Fixed
Fix Version/s: 2.1.0
> When a cluster open replication,regionserver will not clean up the walLog
> references on zk due to no wal entry need to be replicated
> ------------------------------------------------------------------------------------------------------------------------------------
>
> Key: HBASE-22620
> URL: https://issues.apache.org/jira/browse/HBASE-22620
> Project: HBase
> Issue Type: Bug
> Components: Replication
> Affects Versions: 1.2.4, 1.4.9
> Reporter: leizhang
> Priority: Major
> Fix For: 2.1.0
>
>
> When I open the replication feature on my hbase cluster (20 regionserver
> nodes) and added a peer cluster, for example, I create a table with 3 regions
> with REPLICATION_SCOPE set to 1, which opened on 3 regionservers of 20. Due
> to no data（entryBatch） to replicate ,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 (just like ReplicationStatisticsTask.class)
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