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From "Rahul Challapalli (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DRILL-5289) Drill should handle OOM due to insufficient heap type of errors more gracefully
Date Wed, 22 Feb 2017 18:47:44 GMT
Rahul Challapalli created DRILL-5289:
----------------------------------------

             Summary: Drill should handle OOM due to insufficient heap type of errors more
gracefully
                 Key: DRILL-5289
                 URL: https://issues.apache.org/jira/browse/DRILL-5289
             Project: Apache Drill
          Issue Type: Bug
          Components: Execution - Flow, Execution - RPC
    Affects Versions: 1.10.0
            Reporter: Rahul Challapalli


[Git Commit ID will be updated soon]

The below query which uses the managed sort causes an OOM error due to insufficient heap,
which is a bug in itself. 
{code}
ALTER SESSION SET `exec.sort.disable_managed` = false;
+-------+-------------------------------------+
|  ok   |               summary               |
+-------+-------------------------------------+
| true  | exec.sort.disable_managed updated.  |
+-------+-------------------------------------+
1 row selected (1.096 seconds)
0: jdbc:drill:zk=10.10.100.183:5181> alter session set `planner.memory.max_query_memory_per_node`
= 14106127360;
+-------+----------------------------------------------------+
|  ok   |                      summary                       |
+-------+----------------------------------------------------+
| true  | planner.memory.max_query_memory_per_node updated.  |
+-------+----------------------------------------------------+
1 row selected (0.253 seconds)
0: jdbc:drill:zk=10.10.100.183:5181> alter session set `planner.width.max_per_node` = 1;
+-------+--------------------------------------+
|  ok   |               summary                |
+-------+--------------------------------------+
| true  | planner.width.max_per_node updated.  |
+-------+--------------------------------------+
1 row selected (0.184 seconds)
0: jdbc:drill:zk=10.10.100.183:5181> select * from (select * from dfs.`/drill/testdata/resource-manager/250wide.tbl`
order by columns[0])d where d.columns[0] = 'ljdfhwuehnoiueyf';
{code}
Once the OOM happens chaos follows
{code}
1. Dangling fragments are left behind
2. Query fails but zookeeper thinks its still running
3. Client connection timeouts
4. Profile page shows the same query as both running and failed.
{code}

We should be handling this situation more gracefully as this could be perceived as a drillbit
stability issue. I attached the jstack. The logs and data set used are too big to upload here.
Reach out to me if you need more information.



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