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Work on HBASE-12719 started by Sean Busbey. ------------------------------------------- > Add test WAL provider to quantify FSHLog overhead in the absence of HDFS. > ------------------------------------------------------------------------- > > Key: HBASE-12719 > URL: https://issues.apache.org/jira/browse/HBASE-12719 > Project: HBase > Issue Type: Improvement > Components: test, wal > Reporter: Sean Busbey > Assignee: Sean Busbey > Priority: Minor > Fix For: 2.0.0, 1.1.0 > > > Discussion in HBASE-5699 included showing the max throughput for our WAL > benchmark (using the DisabledWALProvider) compared to when we are actually > dealing with synchronization and talking with HDFS. > What we can't see in that comparison is how much of the (sizable) gap is due > to the coordination done in FSHLog to deal with multi-threading and how much > of it is due to talking to HDFS. > Make a test-only provider that we can use to isolate the cost for HDFS > appends, HDFS flush, and file rolling. -- This message was sent by Atlassian JIRA (v6.3.4#6332)