Yiyi Hu created DRILL-3826:
------------------------------
Summary: Concurrent Query Submission leads to Channel Closed
Exception
Key: DRILL-3826
URL: https://issues.apache.org/jira/browse/DRILL-3826
Project: Apache Drill
Issue Type: Bug
Components: Client - JDBC, Execution - RPC
Affects Versions: 1.1.0
Environment: - CentOS release 6.6 (Final)
- hadoop-2.7.1
- hbase-1.0.1.1
- drill-1.1.0
- jdk-1.8.0_45
Reporter: Yiyi Hu
Assignee: Daniel Barclay (Drill)
Frequently seen CHANNEL CLOSED EXCEPTION while running concurrent quries with
relatively large LIMIT.
Here are the details,
SET UP:
- Single drillbit running on a single zookeeper node
- 4G heap size, 8G direct memory
- Storage plugins: local filesystem, hdfs, hbase
TEST DATA:
- A 50,000,000 records json file test.json, with two fields id<Int>,
title<String (approximately 3G).
SHELL TEST:
- Running 4 drill shells concurrently with query:
SELECT id, title from dfs.`test.json` LIMIT 5000000.
- Queries got canceled. Channel closing between client and server were seen
randomly, as an example shown below:
java.lang.RuntimeException: java.sql.SQLException: SYSTEM ERROR:
ChannelClosedException: Channel closed /192.168.4.201:31010 <-->
/192.168.4.201:48829.
Fragment 0:0
[Error Id: 0bd2b500-155e-46e0-9f26-bd89fea47a25 on TEST-101:31010]
at sqlline.IncrementalRows.hasNext(IncrementalRows.java:73)
at
sqlline.TableOutputFormat$ResizingRowsProvider.next(TableOutputFormat.java:87)
at sqlline.TableOutputFormat.print(TableOutputFormat.java:118)
at sqlline.SqlLine.print(SqlLine.java:1583)
at sqlline.Commands.execute(Commands.java:852)
at sqlline.Commands.sql(Commands.java:751)
at sqlline.SqlLine.dispatch(SqlLine.java:738)
at sqlline.SqlLine.begin(SqlLine.java:612)
at sqlline.SqlLine.start(SqlLine.java:366)
at sqlline.SqlLine.main(SqlLine.java:259)
JDBC TEST:
- 6 separate threads running the same query: SELECT id, title from
dfs.`test.json` LIMIT 10000000, each maintains its own connection to drill and
resultSet, statement and connection are closed finally.
- Used resultSet.next() to iterate on the result set, do nothing else.
- Throws the same channel closed exception randomly. Log file were enclosed for
review.
- Memory were monitored, all good.
CROSS STORAGE PLUGINS:
- The same issue can be found not only in JSON on a file system (local/hdfs),
but also when querying the same 50,000,000 records table in HBASE.
- The issue is not found in a single thread application.
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