[ZOOKEEPER-1186] ZooKeeper client seems to hang quietly on OutOfMemoryError

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 3.3.3
• Component/s: java client
• Assignee: Unassigned
• Reporter: Stepan Koltsov
• Created: 15/Sep/11 13:21
• Updated: 01/Nov/11 16:06
• Resolved: 01/Nov/11 16:06

Description

ZooKeeper client seems to hang quietly on OutOfMemoryError.

Look at code of ClientCnxn.SendThread.run:

void run() {
  while (zooKeeper.state.isAlive()) {
    try {
      ...
    } catch (Exception e) {
      // handle exception and restart
    }
  }
  ...
}

If OutOfMemoryError happens somewhere inside of try block, thread just exits and ZooKeeper hangs.

Client should handle any Throwable same way it handles Exception.

Issue Links

• duplicates: ZOOKEEPER-1100 Killed (or missing) SendThread will cause hanging threads