yinghua_zh created HIVE-20927:
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Summary: The beeline has a dead cycle, resulting in high CPU.
Key: HIVE-20927
URL: https://issues.apache.org/jira/browse/HIVE-20927
Project: Hive
Issue Type: Bug
Reporter: yinghua_zh
When beeline executes the command and places it for a period of time, it is
found that the CPU of the beeline process is very high. It is the code that has
a dead loop.The stack is as follows:
"Thread-4" #34 daemon prio=5 os_prio=0 tid=0x00007fbd6636d800 nid=0x162be
sleeping[0x00007fbd2e042000]
java.lang.Thread.State: RUNNABLE
at java.lang.Throwable.fillInStackTrace(Native Method)
at java.lang.Throwable.fillInStackTrace(Throwable.java:783)
- locked <0x000000076edb39d8> (a java.sql.SQLException)
at java.lang.Throwable.<init>(Throwable.java:265)
at java.lang.Exception.<init>(Exception.java:66)
at java.sql.SQLException.<init>(SQLException.java:119)
at org.apache.hive.jdbc.HiveStatement.checkConnection(HiveStatement.java:377)
at org.apache.hive.jdbc.HiveStatement.getQueryLog(HiveStatement.java:865)
at org.apache.hive.jdbc.HiveStatement.getQueryLog(HiveStatement.java:849)
at
org.apache.hive.beeline.Commands$LogRunnable.updateQueryLog(Commands.java:1213)
at org.apache.hive.beeline.Commands$LogRunnable.run(Commands.java:1221)
at java.lang.Thread.run(Thread.java:745)
The dead cycle code is as is as follows:
@Override public void run() {
while (hiveStatement.hasMoreLogs()) {
try {
updateQueryLog();
Thread.sleep(queryProgressInterval);
} catch (SQLException e) {
commands.error(new SQLWarning(e));
} catch (InterruptedException e) {
commands.debug("Getting log thread is interrupted, since query is done!");
commands.showRemainingLogsIfAny(hiveStatement);
}
}
}
}
when the mehtod (checkConnection("getQueryLog");)occurs exception,the condition
"hiveStatement.hasMoreLogs()" is still true,exist the dead lop,but the thread
sleep code is not be run,so the CPU is high!
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