java - Jstack:At which point is Amazon redshift jdbc driver is stuck? -


i executing 7 parallel queries amazon redshift , process output. code cease progress once in while. ran jstack , noticed 7 threads stuck @ epollwait:-

    "thread-124" daemon prio=10 tid=0x00007fc3b0080800 nid=0x72e1 runnable [0x00007fc33868c000]    java.lang.thread.state: runnable         @ sun.nio.ch.epollarraywrapper.epollwait(native method)         @ sun.nio.ch.epollarraywrapper.poll(epollarraywrapper.java:269)         @ sun.nio.ch.epollselectorimpl.doselect(epollselectorimpl.java:79)         @ sun.nio.ch.selectorimpl.lockanddoselect(selectorimpl.java:87)         - locked <0x000000078ec691c8> (a sun.nio.ch.util$2)         - locked <0x000000078ec691b8> (a java.util.collections$unmodifiableset)         - locked <0x000000078ec690a0> (a sun.nio.ch.epollselectorimpl)         @ sun.nio.ch.selectorimpl.select(selectorimpl.java:98)         @ com.amazon.jdbc.communications.inboundmessagesthread.run(inboundmessagesthread.java:309)

looks 7 threads(although in runnable state) held jdbc driver amazon.

  1. i have waited 1 hour until each of query has been executed @ redshift
  2. tcpdump not showing data transfer between application , redshift cluster. means none of thread should have there instruction pointer @ amazon jdbc driver.

from stack trace, don't understand control stuck?

  1. is when driver waiting query execute @ redshift?
  2. or, when driver waiting fetch next line resultset?

depending on able debug further. have been searching, can't find source code of redshift driver. knows method stuck(com.amazon.jdbc.communications.inboundmessagesthread.run)?


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