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Posted to issues@hbase.apache.org by "Sandeep Pal (Jira)" <ji...@apache.org> on 2019/09/28 00:17:00 UTC
[jira] [Updated] (HBASE-22902) At regionserver start there's a
request to roll the WAL
[ https://issues.apache.org/jira/browse/HBASE-22902?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sandeep Pal updated HBASE-22902:
--------------------------------
Attachment: HBASE-22902_branch-1_v1.patch
Status: Patch Available (was: In Progress)
> 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
> Assignee: Sandeep Pal
> Priority: Minor
> Attachments: HBASE-22902_branch-1_v1.patch
>
>
> 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: []*):
> {noformat}
> 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, archiveDir=hdfs://[truncated]/hbase/oldWALs
> 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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