* exists is an idempotent operation. Retry before throwing exception
* @return A Stat instance
*/
public Stat exists(String path, boolean watch)
throws KeeperException, InterruptedException {
TraceScope traceScope = null;
try {
traceScope = Trace.startSpan("RecoverableZookeeper.exists");
RetryCounter retryCounter = retryCounterFactory.create();
while (true) {
try {
return checkZk().exists(path, watch);
} catch (KeeperException e) {
switch (e.code()) {
case CONNECTIONLOSS:
case SESSIONEXPIRED:
case OPERATIONTIMEOUT:
retryOrThrow(retryCounter, e, "exists");
break;
default:
throw e;
}
}
retryCounter.sleepUntilNextRetry();
}
} finally {
if (traceScope != null) traceScope.close();
}
}