leventov commented on a change in pull request #7088: Improve parallelism of
zookeeper based segment change processing
URL: https://github.com/apache/incubator-druid/pull/7088#discussion_r279446220
##########
File path:
server/src/main/java/org/apache/druid/server/coordinator/CuratorLoadQueuePeon.java
##########
@@ -219,199 +220,182 @@ public void unmarkSegmentToDrop(DataSegment
dataSegment)
segmentsMarkedToDrop.remove(dataSegment);
}
- private void processSegmentChangeRequest()
+ private class SegmentChangeProcessor implements Runnable
{
- if (currentlyProcessing != null) {
- log.debug(
- "Server[%s] skipping processSegmentChangeRequest because something
is currently loading[%s].",
- basePath,
- currentlyProcessing.getSegmentId()
- );
+ private final SegmentHolder segmentHolder;
- return;
- }
-
- if (!segmentsToDrop.isEmpty()) {
- currentlyProcessing = segmentsToDrop.firstEntry().getValue();
- log.debug("Server[%s] dropping [%s]", basePath,
currentlyProcessing.getSegmentId());
- } else if (!segmentsToLoad.isEmpty()) {
- currentlyProcessing = segmentsToLoad.firstEntry().getValue();
- log.debug("Server[%s] loading [%s]", basePath,
currentlyProcessing.getSegmentId());
- } else {
- return;
+ private SegmentChangeProcessor(SegmentHolder segmentHolder)
+ {
+ this.segmentHolder = segmentHolder;
}
- try {
- final String path = ZKPaths.makePath(basePath,
currentlyProcessing.getSegmentId().toString());
- final byte[] payload =
jsonMapper.writeValueAsBytes(currentlyProcessing.getChangeRequest());
- curator.create().withMode(CreateMode.EPHEMERAL).forPath(path, payload);
-
- processingExecutor.schedule(
- () -> {
- try {
- if (curator.checkExists().forPath(path) != null) {
- failAssign(new ISE("%s was never removed! Failing this
operation!", path));
+ @Override
+ public void run()
+ {
+ try {
+ final String path = ZKPaths.makePath(basePath,
segmentHolder.getSegmentIdentifier());
+ final byte[] payload =
jsonMapper.writeValueAsBytes(segmentHolder.getChangeRequest());
+ curator.create().withMode(CreateMode.EPHEMERAL).forPath(path, payload);
+ log.debug(
+ "ZKNode created for server to [%s] %s [%s]",
+ basePath,
+ segmentHolder.getType() == LOAD ? "load" : "drop",
+ segmentHolder.getSegmentIdentifier()
+ );
+ final ScheduledFuture<?> future = monitorNodeRemovedExecutor.schedule(
Review comment:
@gianm could you please stop following every PR that I review and comment on
what you think is minor and what you think is not?
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