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From "Jaydeepkumar Chovatia (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-13740) Orphan hint file gets created while node is being removed from cluster
Date Thu, 03 Aug 2017 22:05:00 GMT
Jaydeepkumar Chovatia created CASSANDRA-13740:

             Summary: Orphan hint file gets created while node is being removed from cluster
                 Key: CASSANDRA-13740
             Project: Cassandra
          Issue Type: Bug
          Components: Core
            Reporter: Jaydeepkumar Chovatia
             Fix For: 3.0.15

I have found this new issue during my test, whenever node is being removed then hint file
for that node gets written and stays inside the hint directory forever. I debugged the code
and found that it is due to the race condition between [ |]
and [ |]
*Time t1* Node is down, as a result Hints are being written by [
*Time t2* Node is removed from cluster as a result it calls [
which removes hint files for the node being removed
*Time t3* Mutation stage keeps pumping Hints through [ |]
which again calls [ |]
and new orphan file gets created

I was writing a new dtest for {CASSANDRA-13562, CASSANDRA-13308} and that helped me reproduce
this new bug. I will submit patch for this new dtest later.

I also tried following to check how this orphan hint file responds:
1. I tried {{nodetool truncatehints <node>}} but it fails as node is no longer part
of the ring
2. I then tried {{nodetool truncatehints}}, that still doesn’t remove hint file because
it is not yet included in the [dispatchDequeue |]

Reproducible steps:
Please find dTest python file {{}} attached which reproduces this bug.

This is due to race condition as mentioned above. Since {{}} creates
thread pool with only 1 worker, so solution becomes little simple. Whenever we [
a host, just store it in-memory, and check for already evicted host inside [
If already evicted host is found then ignore hints.


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