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Reid Chan commented on HBASE-18309: ----------------------------------- bq. As concerned, it's possible for thread flood happen and drag NN down. And i have an idea (not quite sure, and need some discussions), but would please allow me to file another jira for that, it's too squeezed to put into one patch. HBASE-19306, FYI @Yu Li and anyone has the same concern > Support multi threads in CleanerChore > ------------------------------------- > > Key: HBASE-18309 > URL: https://issues.apache.org/jira/browse/HBASE-18309 > Project: HBase > Issue Type: Improvement > Components: wal > Reporter: binlijin > Assignee: Reid Chan > Attachments: HBASE-18309.master.001.patch, > HBASE-18309.master.002.patch, HBASE-18309.master.004.patch, > HBASE-18309.master.005.patch, HBASE-18309.master.006.patch, > HBASE-18309.master.007.patch, HBASE-18309.master.008.patch, > HBASE-18309.master.009.patch, HBASE-18309.master.010.patch, > HBASE-18309.master.011.patch, space_consumption_in_archive.png > > > There is only one thread in LogCleaner to clean oldWALs and in our big > cluster we find this is not enough. The number of files under oldWALs reach > the max-directory-items limit of HDFS and cause region server crash, so we > use multi threads for LogCleaner and the crash not happened any more. -- This message was sent by Atlassian JIRA (v6.4.14#64029)