@Override
public void failed(Throwable cause) {
try (SetThreadName ignored = new SetThreadName("ContinuousTaskInfoFetcher-%s", taskId)) {
synchronized (this) {
future = null;
}
try {
// if task not already done, record error
TaskInfo taskInfo = getTaskInfo();
if (!taskInfo.getState().isDone()) {
getErrorTracker.requestFailed(cause);
}
} catch (Error e) {
failTask(e);
abort();
throw e;
} catch (RuntimeException e) {
failTask(e);
abort();
} finally {
// there is no back off here so we can get a lot of error messages when a server spins
// down, but it typically goes away quickly because the queries get canceled
scheduleNextRequest();
}
}
}
@Test(enabled = false)
public void testQuery() throws Exception {
URI location =
client.execute(
preparePost()
.setUri(uriFor("/v1/query"))
.setBodyGenerator(createStaticBodyGenerator("query", UTF_8))
.build(),
new CreatedResponseHandler());
assertQueryStatus(location, QueryState.RUNNING);
QueryInfo queryInfo =
client.execute(
prepareGet().setUri(location).build(),
createJsonResponseHandler(jsonCodec(QueryInfo.class)));
TaskInfo taskInfo = queryInfo.getOutputStage().getTasks().get(0);
URI outputLocation = uriFor("/v1/task/" + taskInfo.getTaskId() + "/results/out");
long sequenceId = 0;
PagesResponse response =
client.execute(
prepareGet()
.setUri(
uriBuilderFrom(outputLocation).appendPath(String.valueOf(sequenceId)).build())
.build(),
new PageResponseHandler());
List<Page> pages = response.getPages();
assertEquals(countPositions(pages), 220);
assertQueryStatus(location, QueryState.RUNNING);
sequenceId += pages.size();
response =
client.execute(
prepareGet()
.setUri(
uriBuilderFrom(outputLocation).appendPath(String.valueOf(sequenceId)).build())
.build(),
new PageResponseHandler());
pages = response.getPages();
assertEquals(countPositions(pages), 44 + 48);
sequenceId += pages.size();
response =
client.execute(
prepareGet()
.setUri(
uriBuilderFrom(outputLocation).appendPath(String.valueOf(sequenceId)).build())
.build(),
new PageResponseHandler());
pages = response.getPages();
assertEquals(countPositions(pages), 0);
assertQueryStatus(location, QueryState.FINISHED);
// cancel the query
StatusResponse cancelResponse =
client.execute(prepareDelete().setUri(location).build(), createStatusResponseHandler());
assertQueryStatus(location, QueryState.FINISHED);
assertEquals(cancelResponse.getStatusCode(), HttpStatus.NO_CONTENT.code());
}
private synchronized void scheduleNextRequest() {
// stopped or done?
TaskInfo taskInfo = HttpRemoteTask.this.taskInfo.get();
if (!running || taskInfo.getState().isDone()) {
return;
}
// outstanding request?
if (future != null && !future.isDone()) {
// this should never happen
log.error("Can not reschedule update because an update is already running");
return;
}
// if throttled due to error, asynchronously wait for timeout and try again
ListenableFuture<?> errorRateLimit = getErrorTracker.acquireRequestPermit();
if (!errorRateLimit.isDone()) {
errorRateLimit.addListener(this::scheduleNextRequest, executor);
return;
}
Request request =
prepareGet()
.setUri(uriBuilderFrom(taskInfo.getSelf()).addParameter("summarize").build())
.setHeader(HttpHeaders.CONTENT_TYPE, MediaType.JSON_UTF_8.toString())
.setHeader(PrestoHeaders.PRESTO_CURRENT_STATE, taskInfo.getState().toString())
.setHeader(PrestoHeaders.PRESTO_MAX_WAIT, refreshMaxWait.toString())
.build();
getErrorTracker.startRequest();
future = httpClient.executeAsync(request, createFullJsonResponseHandler(taskInfoCodec));
Futures.addCallback(
future, new SimpleHttpResponseHandler<>(this, request.getUri()), executor);
}
@Override
public void failed(Throwable cause) {
try (SetThreadName ignored = new SetThreadName("UpdateResponseHandler-%s", taskId)) {
try {
synchronized (HttpRemoteTask.this) {
currentRequest = null;
}
// on failure assume we need to update again
needsUpdate.set(true);
// if task not already done, record error
TaskInfo taskInfo = getTaskInfo();
if (!taskInfo.getState().isDone()) {
updateErrorTracker.requestFailed(cause);
}
} catch (Error e) {
failTask(e);
abort();
throw e;
} catch (RuntimeException e) {
failTask(e);
abort();
} finally {
scheduleUpdate();
}
}
}
/** Move the task directly to the failed state */
private void failTask(Throwable cause) {
TaskInfo taskInfo = getTaskInfo();
if (!taskInfo.getState().isDone()) {
log.debug(cause, "Remote task failed: %s", taskInfo.getSelf());
}
updateTaskInfo(
new TaskInfo(
taskInfo.getTaskId(),
taskInfo.getNodeInstanceId(),
TaskInfo.MAX_VERSION,
TaskState.FAILED,
taskInfo.getSelf(),
taskInfo.getLastHeartbeat(),
taskInfo.getOutputBuffers(),
taskInfo.getNoMoreSplits(),
taskInfo.getStats(),
ImmutableList.of(toFailure(cause))));
}
@Override
public RecordCursor cursor() {
Builder table = InMemoryRecordSet.builder(TASK_TABLE);
for (TaskInfo taskInfo : taskManager.getAllTaskInfo()) {
TaskStats stats = taskInfo.getStats();
table.addRow(
nodeId,
taskInfo.getTaskId().toString(),
taskInfo.getTaskId().getStageId().toString(),
taskInfo.getTaskId().getQueryId().toString(),
taskInfo.getState().toString(),
(long) stats.getTotalDrivers(),
(long) stats.getQueuedDrivers(),
(long) stats.getRunningDrivers(),
(long) stats.getCompletedDrivers(),
toMillis(stats.getTotalScheduledTime()),
toMillis(stats.getTotalCpuTime()),
toMillis(stats.getTotalUserTime()),
toMillis(stats.getTotalBlockedTime()),
toBytes(stats.getRawInputDataSize()),
stats.getRawInputPositions(),
toBytes(stats.getProcessedInputDataSize()),
stats.getProcessedInputPositions(),
toBytes(stats.getOutputDataSize()),
stats.getOutputPositions(),
toTimeStamp(stats.getCreateTime()),
toTimeStamp(stats.getFirstStartTime()),
toTimeStamp(taskInfo.getLastHeartbeat()),
toTimeStamp(stats.getEndTime()));
}
return table.build().cursor();
}
@Override
public synchronized void abort() {
try (SetThreadName ignored = new SetThreadName("HttpRemoteTask-%s", taskId)) {
// clear pending splits to free memory
fireSplitCountChanged(-pendingSourceSplitCount);
pendingSplits.clear();
pendingSourceSplitCount = 0;
// cancel pending request
if (currentRequest != null) {
currentRequest.cancel(true);
currentRequest = null;
currentRequestStartNanos = 0;
}
// mark task as canceled (if not already done)
TaskInfo taskInfo = getTaskInfo();
URI uri = taskInfo.getSelf();
updateTaskInfo(
new TaskInfo(
taskInfo.getTaskId(),
taskInfo.getNodeInstanceId(),
TaskInfo.MAX_VERSION,
TaskState.ABORTED,
uri,
taskInfo.getLastHeartbeat(),
taskInfo.getOutputBuffers(),
taskInfo.getNoMoreSplits(),
taskInfo.getStats(),
ImmutableList.<ExecutionFailureInfo>of()));
// send abort to task and ignore response
Request request =
prepareDelete().setUri(uriBuilderFrom(uri).addParameter("summarize").build()).build();
scheduleAsyncCleanupRequest(new Backoff(MAX_CLEANUP_RETRY_TIME), request, "abort");
}
}
private void logQueryTimeline(QueryInfo queryInfo) {
try {
QueryStats queryStats = queryInfo.getQueryStats();
DateTime queryStartTime = queryStats.getCreateTime();
DateTime queryEndTime = queryStats.getEndTime();
// query didn't finish cleanly
if (queryStartTime == null || queryEndTime == null) {
return;
}
// planning duration -- start to end of planning
Duration planning = queryStats.getTotalPlanningTime();
if (planning == null) {
planning = new Duration(0, MILLISECONDS);
}
List<StageInfo> stages = StageInfo.getAllStages(queryInfo.getOutputStage());
// long lastSchedulingCompletion = 0;
long firstTaskStartTime = queryEndTime.getMillis();
long lastTaskStartTime = queryStartTime.getMillis() + planning.toMillis();
long lastTaskEndTime = queryStartTime.getMillis() + planning.toMillis();
for (StageInfo stage : stages) {
// only consider leaf stages
if (!stage.getSubStages().isEmpty()) {
continue;
}
for (TaskInfo taskInfo : stage.getTasks()) {
TaskStats taskStats = taskInfo.getStats();
DateTime firstStartTime = taskStats.getFirstStartTime();
if (firstStartTime != null) {
firstTaskStartTime = Math.min(firstStartTime.getMillis(), firstTaskStartTime);
}
DateTime lastStartTime = taskStats.getLastStartTime();
if (lastStartTime != null) {
lastTaskStartTime = Math.max(lastStartTime.getMillis(), lastTaskStartTime);
}
DateTime endTime = taskStats.getEndTime();
if (endTime != null) {
lastTaskEndTime = Math.max(endTime.getMillis(), lastTaskEndTime);
}
}
}
Duration elapsed = millis(queryEndTime.getMillis() - queryStartTime.getMillis());
Duration scheduling =
millis(firstTaskStartTime - queryStartTime.getMillis() - planning.toMillis());
Duration running = millis(lastTaskEndTime - firstTaskStartTime);
Duration finishing = millis(queryEndTime.getMillis() - lastTaskEndTime);
log.info(
"TIMELINE: Query %s :: elapsed %s :: planning %s :: scheduling %s :: running %s :: finishing %s :: begin %s :: end %s",
queryInfo.getQueryId(),
elapsed,
planning,
scheduling,
running,
finishing,
queryStartTime,
queryEndTime);
} catch (Exception e) {
log.error(e, "Error logging query timeline");
}
}
private synchronized void updateTaskInfo(TaskInfo newValue, List<TaskSource> sources) {
if (newValue.getState().isDone()) {
// splits can be huge so clear the list
pendingSplits.clear();
fireSplitCountChanged(-pendingSourceSplitCount);
pendingSourceSplitCount = 0;
}
int oldPartitionedSplitCount = getPartitionedSplitCount();
// change to new value if old value is not changed and new value has a newer version
AtomicBoolean workerRestarted = new AtomicBoolean();
boolean updated =
taskInfo.setIf(
newValue,
oldValue -> {
// did the worker restart
if (oldValue.getNodeInstanceId().isPresent()
&& !oldValue.getNodeInstanceId().equals(newValue.getNodeInstanceId())) {
workerRestarted.set(true);
return false;
}
if (oldValue.getState().isDone()) {
// never update if the task has reached a terminal state
return false;
}
if (newValue.getVersion() < oldValue.getVersion()) {
// don't update to an older version (same version is ok)
return false;
}
return true;
});
if (workerRestarted.get()) {
PrestoException exception =
new PrestoException(
WORKER_RESTARTED, format("%s (%s)", WORKER_RESTARTED_ERROR, newValue.getSelf()));
failTask(exception);
abort();
}
// remove acknowledged splits, which frees memory
for (TaskSource source : sources) {
PlanNodeId planNodeId = source.getPlanNodeId();
int removed = 0;
for (ScheduledSplit split : source.getSplits()) {
if (pendingSplits.remove(planNodeId, split)) {
removed++;
}
}
if (planNodeId.equals(planFragment.getPartitionedSource())) {
pendingSourceSplitCount -= removed;
}
}
if (updated) {
if (getTaskInfo().getState().isDone()) {
fireSplitCountChanged(-oldPartitionedSplitCount);
} else {
fireSplitCountChanged(getPartitionedSplitCount() - oldPartitionedSplitCount);
}
}
}