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From "David Manning (Jira)" <j...@apache.org>
Subject [jira] [Created] (HBASE-22902) At regionserver start there's a request to roll the WAL
Date Thu, 22 Aug 2019 23:36:00 GMT
David Manning created HBASE-22902:

             Summary: At regionserver start there's a request to roll the WAL
                 Key: HBASE-22902
                 URL: https://issues.apache.org/jira/browse/HBASE-22902
             Project: HBase
          Issue Type: Bug
          Components: wal
    Affects Versions: 3.0.0, 1.5.0, 2.3.0
            Reporter: David Manning

See HBASE-22301 for logic that requests to roll the WAL if regionserver encounters a slow
write pipeline. In the logs, during regionserver start, I see that the WAL is requested to
roll once. It's strange that we roll the WAL because it wasn't a slow sync. It appears when
this code executes, we haven't initialized the {{rollOnSyncNs}} variable to use for determining
whether it's a slow sync. Current pipeline also shows empty in the logs.

Disclaimer: I'm experiencing this after backporting this to 1.3.x and building it there -
I haven't attempted in 1.5.x, though I'd expect similar results.

Regionserver logs follow (notice *threshold=0 ms, current pipeline: []*):
Tue Aug 20 23:29:50 GMT 2019 Starting regionserver
2019-08-20 23:29:57,824 INFO  wal.FSHLog - WAL configuration: blocksize=256 MB, rollsize=243.20
MB, prefix=[truncated]%2C1566343792434, suffix=, logDir=hdfs://[truncated]/hbase/WALs/[truncated],1566343792434,
2019-08-20 23:29:58,104 INFO  wal.FSHLog - Slow sync cost: 186 ms, current pipeline: []
2019-08-20 23:29:58,104 WARN  wal.FSHLog - Requesting log roll because we exceeded slow sync
threshold; time=186 ms, threshold=0 ms, current pipeline: []
2019-08-20 23:29:58,107 DEBUG regionserver.ReplicationSourceManager - Start tracking logs
for wal group [truncated]%2C1566343792434 for peer 1
2019-08-20 23:29:58,107 INFO  wal.FSHLog - New WAL /hbase/WALs/[truncated],1566343792434/[truncated]%2C1566343792434.1566343797824
2019-08-20 23:29:58,109 DEBUG regionserver.ReplicationSource - Starting up worker for wal
group [truncated]%2C1566343792434{noformat}

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