[ https://issues.apache.org/jira/browse/HBASE-12075?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14196877#comment-14196877 ]
stack commented on HBASE-12075: ------------------------------- bq. stack, let me take a look. Doesn't seem like it was failing on trunk. Agree. branch-1 seems to be a little more 'fragile' Insight appreciated. ITs a rare fail it seems. > Preemptive Fast Fail > -------------------- > > Key: HBASE-12075 > URL: https://issues.apache.org/jira/browse/HBASE-12075 > Project: HBase > Issue Type: Sub-task > Components: Client > Affects Versions: 0.99.0, 2.0.0, 0.98.6.1 > Reporter: Manukranth Kolloju > Assignee: Manukranth Kolloju > Fix For: 2.0.0, 0.99.2 > > Attachments: 0001-Add-a-test-case-for-Preemptive-Fast-Fail.patch, > 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, > 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, > 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, > 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, > 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, > 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, > 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, > 0001-HBASE-12075-Implement-Preemptive-Fast-Fail.patch, > 0001-Implement-Preemptive-Fast-Fail.patch, > 0001-Implement-Preemptive-Fast-Fail.patch, > 0001-Implement-Preemptive-Fast-Fail.patch, > 0001-Implement-Preemptive-Fast-Fail.patch, > 0001-Implement-Preemptive-Fast-Fail.patch, > HBASE-12075-Preemptive-Fast-Fail-V15.patch > > > In multi threaded clients, we use a feature developed on 0.89-fb branch > called Preemptive Fast Fail. This allows the client threads which would > potentially fail, fail fast. The idea behind this feature is that we allow, > among the hundreds of client threads, one thread to try and establish > connection with the regionserver and if that succeeds, we mark it as a live > node again. Meanwhile, other threads which are trying to establish connection > to the same server would ideally go into the timeouts which is effectively > unfruitful. We can in those cases return appropriate exceptions to those > clients instead of letting them retry. -- This message was sent by Atlassian JIRA (v6.3.4#6332)