[
https://issues.apache.org/jira/browse/HIVE-24432?focusedWorklogId=523271&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-523271
]
ASF GitHub Bot logged work on HIVE-24432:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 11/Dec/20 18:38
Start Date: 11/Dec/20 18:38
Worklog Time Spent: 10m
Work Description: belugabehr commented on a change in pull request #1710:
URL: https://github.com/apache/hive/pull/1710#discussion_r541149698
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/ObjectStore.java
##########
@@ -10800,53 +10801,89 @@ public void addNotificationEvent(NotificationEvent
entry) throws MetaException {
@Override
public void cleanNotificationEvents(int olderThan) {
- boolean commited = false;
- Query query = null;
+ final int eventBatchSize = MetastoreConf.getIntVar(conf,
MetastoreConf.ConfVars.EVENT_CLEAN_MAX_EVENTS);
+
+ final long ageSec = olderThan;
+ final Instant now = Instant.now();
+
+ final int tooOld = Math.toIntExact(now.getEpochSecond() - ageSec);
+
+ final Optional<Integer> batchSize = (eventBatchSize > 0) ?
Optional.of(eventBatchSize) : Optional.empty();
+
+ final long start = System.nanoTime();
+ int deleteCount = doCleanNotificationEvents(tooOld, batchSize);
+
+ if (deleteCount == 0) {
+ LOG.info("No Notification events found to be cleaned with eventTime <
{}", tooOld);
+ } else {
+ int batchCount = 0;
+ do {
+ batchCount = doCleanNotificationEvents(tooOld, batchSize);
+ deleteCount += batchCount;
+ } while (batchCount > 0);
+ }
+
+ final long finish = System.nanoTime();
+
+ LOG.info("Deleted {} notification events older than epoch:{} in {}ms",
deleteCount, tooOld,
+ TimeUnit.NANOSECONDS.toMillis(finish - start));
+ }
+
+ private int doCleanNotificationEvents(final int ageSec, final
Optional<Integer> batchSize) {
+ final Transaction tx = pm.currentTransaction();
+ int eventsCount = 0;
+
try {
- openTransaction();
- long tmp = System.currentTimeMillis() / 1000 - olderThan;
- int tooOld = (tmp > Integer.MAX_VALUE) ? 0 : (int) tmp;
- query = pm.newQuery(MNotificationLog.class, "eventTime < tooOld");
- query.declareParameters("java.lang.Integer tooOld");
+ tx.begin();
- int max_events = MetastoreConf.getIntVar(conf,
MetastoreConf.ConfVars.EVENT_CLEAN_MAX_EVENTS);
- max_events = max_events > 0 ? max_events : Integer.MAX_VALUE;
- query.setRange(0, max_events);
- query.setOrdering("eventId ascending");
+ try (Query query = pm.newQuery(MNotificationLog.class, "eventTime <
tooOld")) {
+ query.declareParameters("java.lang.Integer tooOld");
+ query.setOrdering("eventId ascending");
+ if (batchSize.isPresent()) {
+ query.setRange(0, batchSize.get());
+ }
- List<MNotificationLog> toBeRemoved = (List) query.execute(tooOld);
- int iteration = 0;
- int eventCount = 0;
- long minEventId = 0;
- long minEventTime = 0;
- long maxEventId = 0;
- long maxEventTime = 0;
- while (CollectionUtils.isNotEmpty(toBeRemoved)) {
- int listSize = toBeRemoved.size();
- if (iteration == 0) {
- MNotificationLog firstNotification = toBeRemoved.get(0);
- minEventId = firstNotification.getEventId();
- minEventTime = firstNotification.getEventTime();
+ List<MNotificationLog> events = (List) query.execute(ageSec);
+ if (CollectionUtils.isNotEmpty(events)) {
+ eventsCount = events.size();
+
+ if (LOG.isDebugEnabled()) {
+ int minEventTime, maxEventTime;
+ long minEventId, maxEventId;
+ Iterator<MNotificationLog> iter = events.iterator();
+ MNotificationLog firstNotification = iter.next();
+
+ minEventTime = maxEventTime = firstNotification.getEventTime();
+ minEventId = maxEventId = firstNotification.getEventId();
+
+ while (iter.hasNext()) {
+ MNotificationLog notification = iter.next();
Review comment:
@aasha I updated existing unit tests to enforce small batch sizes (size
= 1) so that when it deletes records, it does so in batches of 1.
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Issue Time Tracking
-------------------
Worklog Id: (was: 523271)
Time Spent: 3h 20m (was: 3h 10m)
> Delete Notification Events in Batches
> -------------------------------------
>
> Key: HIVE-24432
> URL: https://issues.apache.org/jira/browse/HIVE-24432
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 3.2.0
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Major
> Labels: pull-request-available
> Time Spent: 3h 20m
> Remaining Estimate: 0h
>
> Notification events are loaded in batches (reduces memory pressure on the
> HMS), but all of the deletes happen under a single transactions and, when
> deleting many records, can put a lot of pressure on the backend database.
> Instead, delete events in batches (in different transactions) as well.
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