Github user sohami commented on a diff in the pull request:
https://github.com/apache/drill/pull/679#discussion_r92296665
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/client/DrillClient.java ---
@@ -357,10 +357,53 @@ protected void afterExecute(final Runnable r, final
Throwable t) {
super.afterExecute(r, t);
}
};
- client = new UserClient(clientName, config, supportComplexTypes,
allocator, eventLoopGroup, executor);
- logger.debug("Connecting to server {}:{}", endpoint.getAddress(),
endpoint.getUserPort());
- connect(endpoint);
- connected = true;
+
+ // "tries" is max number of unique drillbit to try connecting until
successfully connected to one of them
+ final String connectTriesConf = (props != null) ?
props.getProperty("tries", "5") : "5";
+
+ int connectTriesVal;
+ try {
+ connectTriesVal = Math.min(endpoints.size(),
Integer.parseInt(connectTriesConf));
+ } catch (NumberFormatException e) {
+ throw new InvalidConnectionInfoException("Invalid tries value: " +
connectTriesConf + " specified in " +
+ "connection string");
+ }
+
+ // If the value provided in the connection string is <=0 then override
with 1 since we want to try connecting
+ // at least once
+ connectTriesVal = Math.max(1, connectTriesVal);
+
+ int triedEndpointIndex = 0;
+ DrillbitEndpoint endpoint;
+
+ while (triedEndpointIndex < connectTriesVal) {
+ client = new UserClient(clientName, config, supportComplexTypes,
allocator, eventLoopGroup, executor);
+ endpoint = endpoints.get(triedEndpointIndex);
+ logger.debug("Connecting to server {}:{}", endpoint.getAddress(),
endpoint.getUserPort());
+
+ try {
+ connect(endpoint);
+ connected = true;
+ logger.info("Successfully connected to server {}:{}",
endpoint.getAddress(), endpoint.getUserPort());
+ break;
+ } catch (InvalidConnectionInfoException ex) {
+ logger.error("Connection to {}:{} failed with error {}. Not
retrying anymore", endpoint.getAddress(),
+ endpoint.getUserPort(), ex.getMessage());
+ throw ex;
+ } catch (RpcException ex) {
+ ++triedEndpointIndex;
+ logger.error("Attempt {}: Failed to connect to server {}:{}",
triedEndpointIndex, endpoint.getAddress(),
+ endpoint.getUserPort());
+
+ // Close the connection
+ client.close();
--- End diff --
I didn't found anywhere in documentation specifying the cause of calling
close multiple times. It just says that internally close is being called for
each handler in the pipeline.
https://netty.io/4.0/api/io/netty/channel/Channel.html#close()
Though I do have unit tests which will result in covering that code path
where close will be called twice. Didn't found any issue running the test.
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