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Posted to issues@lucene.apache.org by GitBox <gi...@apache.org> on 2020/05/14 23:48:46 UTC
[GitHub] [lucene-solr] megancarey commented on a change in pull request #1504: SOLR-14462: cache more than one autoscaling session
megancarey commented on a change in pull request #1504:
URL: https://github.com/apache/lucene-solr/pull/1504#discussion_r425424095
##########
File path: solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/PolicyHelper.java
##########
@@ -382,45 +383,55 @@ static MapWriter loggingInfo(Policy policy, SolrCloudManager cloudManager, Sugge
}
public enum Status {
- NULL,
- //it is just created and not yet used or all operations on it has been completed fully
- UNUSED,
- COMPUTING, EXECUTING
+ COMPUTING, // A command is actively using and modifying the session to compute placements
+ EXECUTING // A command is not done yet processing its changes but no longer uses the session
}
/**
- * This class stores a session for sharing purpose. If a process creates a session to
- * compute operations,
- * 1) see if there is a session that is available in the cache,
- * 2) if yes, check if it is expired
- * 3) if it is expired, create a new session
- * 4) if it is not expired, borrow it
- * 5) after computing operations put it back in the cache
+ * This class stores sessions for sharing purposes. If a process requirees a session to
Review comment:
Minor: "requirees" -> requires
##########
File path: solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/PolicyHelper.java
##########
@@ -429,87 +440,124 @@ private void release(SessionWrapper sessionWrapper) {
* The session can be used by others while the caller is performing operations
*/
private void returnSession(SessionWrapper sessionWrapper) {
- TimeSource timeSource = sessionWrapper.session != null ? sessionWrapper.session.cloudManager.getTimeSource() : TimeSource.NANO_TIME;
+ boolean present;
synchronized (lockObj) {
sessionWrapper.status = Status.EXECUTING;
- if (log.isDebugEnabled()) {
- log.debug("returnSession, curr-time {} sessionWrapper.createTime {}, this.sessionWrapper.createTime {} "
- , time(timeSource, MILLISECONDS),
- sessionWrapper.createTime,
- this.sessionWrapper.createTime);
- }
- if (sessionWrapper.createTime == this.sessionWrapper.createTime) {
- //this session was used for computing new operations and this can now be used for other
- // computing
- this.sessionWrapper = sessionWrapper;
+ present = sessionWrapperSet.contains(sessionWrapper);
- //one thread who is waiting for this need to be notified.
- lockObj.notify();
- } else {
- log.debug("create time NOT SAME {} ", SessionWrapper.DEFAULT_INSTANCE.createTime);
- //else just ignore it
- }
+ // wake up single thread waiting for a session return (ok if not woken up, wait is short)
+ lockObj.notify();
}
+ // Logging
+ if (present) {
+ if (log.isDebugEnabled()) {
+ log.debug("returnSession {}", sessionWrapper.getCreateTime());
+ }
+ } else {
+ log.warn("returning unknown session {} ", sessionWrapper.getCreateTime());
+ }
}
- public SessionWrapper get(SolrCloudManager cloudManager) throws IOException, InterruptedException {
+ public SessionWrapper get(SolrCloudManager cloudManager, boolean allowWait) throws IOException, InterruptedException {
TimeSource timeSource = cloudManager.getTimeSource();
+ long oldestUpdateTimeNs = TimeUnit.SECONDS.convert(timeSource.getTimeNs(), TimeUnit.NANOSECONDS) - SESSION_EXPIRY;
+ int zkVersion = cloudManager.getDistribStateManager().getAutoScalingConfig().getZkVersion();
+
synchronized (lockObj) {
- if (sessionWrapper.status == Status.NULL ||
- sessionWrapper.zkVersion != cloudManager.getDistribStateManager().getAutoScalingConfig().getZkVersion() ||
- TimeUnit.SECONDS.convert(timeSource.getTimeNs() - sessionWrapper.lastUpdateTime, TimeUnit.NANOSECONDS) > SESSION_EXPIRY) {
- //no session available or the session is expired
+ // If nothing in the cache can possibly work, create a new session
+ if (!hasNonExpiredSession(zkVersion, oldestUpdateTimeNs)) {
return createSession(cloudManager);
- } else {
+ }
+
+ // Try to find a session available right away
+ SessionWrapper sw = getAvailableSession(zkVersion, oldestUpdateTimeNs);
+
+ if (sw != null) {
+ if (log.isDebugEnabled()) {
+ log.debug("reusing session {}", sw.getCreateTime());
+ }
+ return sw;
+ } else if (allowWait) {
+ // No session available, but if we wait a bit, maybe one can become available
+ // wait 1 to 10 secs in case a session is returned. Random to spread wakeup otherwise sessions not reused
+ long waitForMs = (long) (Math.random() * 9 * 1000 + 1000);
+
+ if (log.isDebugEnabled()) {
+ log.debug("No sessions are available, all busy COMPUTING. starting wait of {}ms", waitForMs);
+ }
long waitStart = time(timeSource, MILLISECONDS);
- //the session is not expired
- log.debug("reusing a session {}", this.sessionWrapper.createTime);
- if (this.sessionWrapper.status == Status.UNUSED || this.sessionWrapper.status == Status.EXECUTING) {
- this.sessionWrapper.status = Status.COMPUTING;
- return sessionWrapper;
- } else {
- //status= COMPUTING it's being used for computing. computing is
- if (log.isDebugEnabled()) {
- log.debug("session being used. waiting... current time {} ", time(timeSource, MILLISECONDS));
- }
- try {
- lockObj.wait(10 * 1000);//wait for a max of 10 seconds
- } catch (InterruptedException e) {
- log.info("interrupted... ");
- }
+ try {
+ lockObj.wait(waitForMs);
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ }
+
+ if (log.isDebugEnabled()) {
+ log.debug("out of waiting. wait of {}ms, actual time elapsed {}ms", waitForMs, timeElapsed(timeSource, waitStart, MILLISECONDS));
+ }
+
+ // Try again to find an available session
+ sw = getAvailableSession(zkVersion, oldestUpdateTimeNs);
+
+ if (sw != null) {
if (log.isDebugEnabled()) {
- log.debug("out of waiting curr-time:{} time-elapsed {}"
- , time(timeSource, MILLISECONDS), timeElapsed(timeSource, waitStart, MILLISECONDS));
- }
- // now this thread has woken up because it got timed out after 10 seconds or it is notified after
- // the session was returned from another COMPUTING operation
- if (this.sessionWrapper.status == Status.UNUSED || this.sessionWrapper.status == Status.EXECUTING) {
- log.debug("Wait over. reusing the existing session ");
- this.sessionWrapper.status = Status.COMPUTING;
- return sessionWrapper;
- } else {
- //create a new Session
- return createSession(cloudManager);
+ log.debug("Wait over. reusing an existing session {}", sw.getCreateTime());
}
+ return sw;
+ } else {
+ return createSession(cloudManager);
}
+ } else {
+ return createSession(cloudManager);
}
}
}
+ /**
+ * Returns an available session from the cache (the best one once cache strategies are defined), or null if no session
+ * from the cache is available (i.e. all are still COMPUTING, are too old, wrong zk version or the cache is empty).<p>
+ * This method must be called while holding the monitor on {@link #lockObj}.<p>
+ * The method updates the session status to computing.
+ */
+ private SessionWrapper getAvailableSession(int zkVersion, long oldestUpdateTimeNs) {
+ for (SessionWrapper sw : sessionWrapperSet) {
+ if (sw.status == Status.EXECUTING && sw.getLastUpdateTime() >= oldestUpdateTimeNs && sw.zkVersion == zkVersion) {
+ sw.status = Status.COMPUTING;
+ return sw;
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Returns true if there's a session in the cache that could be returned (if it was free). This is required to
+ * know if there's any point in waiting or if a new session should better be created right away.
+ */
+ private boolean hasNonExpiredSession(int zkVersion, long oldestUpdateTimeNs) {
+ for (SessionWrapper sw : sessionWrapperSet) {
+ if (sw.getLastUpdateTime() >= oldestUpdateTimeNs && sw.zkVersion == zkVersion) {
+ return true;
+ }
+ }
+ return false;
+ }
+
private SessionWrapper createSession(SolrCloudManager cloudManager) throws InterruptedException, IOException {
- synchronized (lockObj) {
+ if (log.isDebugEnabled()) {
Review comment:
Assuming the thread could be waiting on the lockObj for a while, it might make more sense to leave at the beginning of the critical section?
##########
File path: solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/PolicyHelper.java
##########
@@ -429,87 +440,124 @@ private void release(SessionWrapper sessionWrapper) {
* The session can be used by others while the caller is performing operations
*/
private void returnSession(SessionWrapper sessionWrapper) {
- TimeSource timeSource = sessionWrapper.session != null ? sessionWrapper.session.cloudManager.getTimeSource() : TimeSource.NANO_TIME;
+ boolean present;
synchronized (lockObj) {
sessionWrapper.status = Status.EXECUTING;
- if (log.isDebugEnabled()) {
- log.debug("returnSession, curr-time {} sessionWrapper.createTime {}, this.sessionWrapper.createTime {} "
- , time(timeSource, MILLISECONDS),
- sessionWrapper.createTime,
- this.sessionWrapper.createTime);
- }
- if (sessionWrapper.createTime == this.sessionWrapper.createTime) {
- //this session was used for computing new operations and this can now be used for other
- // computing
- this.sessionWrapper = sessionWrapper;
+ present = sessionWrapperSet.contains(sessionWrapper);
- //one thread who is waiting for this need to be notified.
- lockObj.notify();
- } else {
- log.debug("create time NOT SAME {} ", SessionWrapper.DEFAULT_INSTANCE.createTime);
- //else just ignore it
- }
+ // wake up single thread waiting for a session return (ok if not woken up, wait is short)
+ lockObj.notify();
}
+ // Logging
+ if (present) {
+ if (log.isDebugEnabled()) {
+ log.debug("returnSession {}", sessionWrapper.getCreateTime());
+ }
+ } else {
+ log.warn("returning unknown session {} ", sessionWrapper.getCreateTime());
+ }
}
- public SessionWrapper get(SolrCloudManager cloudManager) throws IOException, InterruptedException {
+ public SessionWrapper get(SolrCloudManager cloudManager, boolean allowWait) throws IOException, InterruptedException {
TimeSource timeSource = cloudManager.getTimeSource();
+ long oldestUpdateTimeNs = TimeUnit.SECONDS.convert(timeSource.getTimeNs(), TimeUnit.NANOSECONDS) - SESSION_EXPIRY;
+ int zkVersion = cloudManager.getDistribStateManager().getAutoScalingConfig().getZkVersion();
+
synchronized (lockObj) {
- if (sessionWrapper.status == Status.NULL ||
- sessionWrapper.zkVersion != cloudManager.getDistribStateManager().getAutoScalingConfig().getZkVersion() ||
- TimeUnit.SECONDS.convert(timeSource.getTimeNs() - sessionWrapper.lastUpdateTime, TimeUnit.NANOSECONDS) > SESSION_EXPIRY) {
- //no session available or the session is expired
+ // If nothing in the cache can possibly work, create a new session
+ if (!hasNonExpiredSession(zkVersion, oldestUpdateTimeNs)) {
return createSession(cloudManager);
- } else {
+ }
+
+ // Try to find a session available right away
+ SessionWrapper sw = getAvailableSession(zkVersion, oldestUpdateTimeNs);
+
+ if (sw != null) {
+ if (log.isDebugEnabled()) {
+ log.debug("reusing session {}", sw.getCreateTime());
+ }
+ return sw;
+ } else if (allowWait) {
+ // No session available, but if we wait a bit, maybe one can become available
+ // wait 1 to 10 secs in case a session is returned. Random to spread wakeup otherwise sessions not reused
+ long waitForMs = (long) (Math.random() * 9 * 1000 + 1000);
+
+ if (log.isDebugEnabled()) {
+ log.debug("No sessions are available, all busy COMPUTING. starting wait of {}ms", waitForMs);
+ }
long waitStart = time(timeSource, MILLISECONDS);
- //the session is not expired
- log.debug("reusing a session {}", this.sessionWrapper.createTime);
- if (this.sessionWrapper.status == Status.UNUSED || this.sessionWrapper.status == Status.EXECUTING) {
- this.sessionWrapper.status = Status.COMPUTING;
- return sessionWrapper;
- } else {
- //status= COMPUTING it's being used for computing. computing is
- if (log.isDebugEnabled()) {
- log.debug("session being used. waiting... current time {} ", time(timeSource, MILLISECONDS));
- }
- try {
- lockObj.wait(10 * 1000);//wait for a max of 10 seconds
- } catch (InterruptedException e) {
- log.info("interrupted... ");
- }
+ try {
+ lockObj.wait(waitForMs);
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ }
+
+ if (log.isDebugEnabled()) {
+ log.debug("out of waiting. wait of {}ms, actual time elapsed {}ms", waitForMs, timeElapsed(timeSource, waitStart, MILLISECONDS));
+ }
+
+ // Try again to find an available session
+ sw = getAvailableSession(zkVersion, oldestUpdateTimeNs);
+
+ if (sw != null) {
if (log.isDebugEnabled()) {
- log.debug("out of waiting curr-time:{} time-elapsed {}"
- , time(timeSource, MILLISECONDS), timeElapsed(timeSource, waitStart, MILLISECONDS));
- }
- // now this thread has woken up because it got timed out after 10 seconds or it is notified after
- // the session was returned from another COMPUTING operation
- if (this.sessionWrapper.status == Status.UNUSED || this.sessionWrapper.status == Status.EXECUTING) {
- log.debug("Wait over. reusing the existing session ");
- this.sessionWrapper.status = Status.COMPUTING;
- return sessionWrapper;
- } else {
- //create a new Session
- return createSession(cloudManager);
+ log.debug("Wait over. reusing an existing session {}", sw.getCreateTime());
}
+ return sw;
+ } else {
+ return createSession(cloudManager);
}
+ } else {
+ return createSession(cloudManager);
}
}
}
+ /**
+ * Returns an available session from the cache (the best one once cache strategies are defined), or null if no session
+ * from the cache is available (i.e. all are still COMPUTING, are too old, wrong zk version or the cache is empty).<p>
+ * This method must be called while holding the monitor on {@link #lockObj}.<p>
+ * The method updates the session status to computing.
+ */
+ private SessionWrapper getAvailableSession(int zkVersion, long oldestUpdateTimeNs) {
+ for (SessionWrapper sw : sessionWrapperSet) {
+ if (sw.status == Status.EXECUTING && sw.getLastUpdateTime() >= oldestUpdateTimeNs && sw.zkVersion == zkVersion) {
+ sw.status = Status.COMPUTING;
+ return sw;
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Returns true if there's a session in the cache that could be returned (if it was free). This is required to
+ * know if there's any point in waiting or if a new session should better be created right away.
+ */
+ private boolean hasNonExpiredSession(int zkVersion, long oldestUpdateTimeNs) {
Review comment:
Nit: rename to "hasViableSession" or something since it also requires zkVersion check
##########
File path: solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/PolicyHelper.java
##########
@@ -429,87 +440,124 @@ private void release(SessionWrapper sessionWrapper) {
* The session can be used by others while the caller is performing operations
*/
private void returnSession(SessionWrapper sessionWrapper) {
- TimeSource timeSource = sessionWrapper.session != null ? sessionWrapper.session.cloudManager.getTimeSource() : TimeSource.NANO_TIME;
+ boolean present;
synchronized (lockObj) {
sessionWrapper.status = Status.EXECUTING;
- if (log.isDebugEnabled()) {
- log.debug("returnSession, curr-time {} sessionWrapper.createTime {}, this.sessionWrapper.createTime {} "
- , time(timeSource, MILLISECONDS),
- sessionWrapper.createTime,
- this.sessionWrapper.createTime);
- }
- if (sessionWrapper.createTime == this.sessionWrapper.createTime) {
- //this session was used for computing new operations and this can now be used for other
- // computing
- this.sessionWrapper = sessionWrapper;
+ present = sessionWrapperSet.contains(sessionWrapper);
- //one thread who is waiting for this need to be notified.
- lockObj.notify();
- } else {
- log.debug("create time NOT SAME {} ", SessionWrapper.DEFAULT_INSTANCE.createTime);
- //else just ignore it
- }
+ // wake up single thread waiting for a session return (ok if not woken up, wait is short)
+ lockObj.notify();
}
+ // Logging
+ if (present) {
+ if (log.isDebugEnabled()) {
+ log.debug("returnSession {}", sessionWrapper.getCreateTime());
+ }
+ } else {
+ log.warn("returning unknown session {} ", sessionWrapper.getCreateTime());
+ }
}
- public SessionWrapper get(SolrCloudManager cloudManager) throws IOException, InterruptedException {
+ public SessionWrapper get(SolrCloudManager cloudManager, boolean allowWait) throws IOException, InterruptedException {
TimeSource timeSource = cloudManager.getTimeSource();
+ long oldestUpdateTimeNs = TimeUnit.SECONDS.convert(timeSource.getTimeNs(), TimeUnit.NANOSECONDS) - SESSION_EXPIRY;
+ int zkVersion = cloudManager.getDistribStateManager().getAutoScalingConfig().getZkVersion();
+
synchronized (lockObj) {
- if (sessionWrapper.status == Status.NULL ||
- sessionWrapper.zkVersion != cloudManager.getDistribStateManager().getAutoScalingConfig().getZkVersion() ||
- TimeUnit.SECONDS.convert(timeSource.getTimeNs() - sessionWrapper.lastUpdateTime, TimeUnit.NANOSECONDS) > SESSION_EXPIRY) {
- //no session available or the session is expired
+ // If nothing in the cache can possibly work, create a new session
+ if (!hasNonExpiredSession(zkVersion, oldestUpdateTimeNs)) {
return createSession(cloudManager);
- } else {
+ }
+
+ // Try to find a session available right away
+ SessionWrapper sw = getAvailableSession(zkVersion, oldestUpdateTimeNs);
+
+ if (sw != null) {
+ if (log.isDebugEnabled()) {
+ log.debug("reusing session {}", sw.getCreateTime());
+ }
+ return sw;
+ } else if (allowWait) {
+ // No session available, but if we wait a bit, maybe one can become available
+ // wait 1 to 10 secs in case a session is returned. Random to spread wakeup otherwise sessions not reused
+ long waitForMs = (long) (Math.random() * 9 * 1000 + 1000);
+
+ if (log.isDebugEnabled()) {
+ log.debug("No sessions are available, all busy COMPUTING. starting wait of {}ms", waitForMs);
+ }
long waitStart = time(timeSource, MILLISECONDS);
- //the session is not expired
- log.debug("reusing a session {}", this.sessionWrapper.createTime);
- if (this.sessionWrapper.status == Status.UNUSED || this.sessionWrapper.status == Status.EXECUTING) {
- this.sessionWrapper.status = Status.COMPUTING;
- return sessionWrapper;
- } else {
- //status= COMPUTING it's being used for computing. computing is
- if (log.isDebugEnabled()) {
- log.debug("session being used. waiting... current time {} ", time(timeSource, MILLISECONDS));
- }
- try {
- lockObj.wait(10 * 1000);//wait for a max of 10 seconds
- } catch (InterruptedException e) {
- log.info("interrupted... ");
- }
+ try {
+ lockObj.wait(waitForMs);
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ }
+
+ if (log.isDebugEnabled()) {
+ log.debug("out of waiting. wait of {}ms, actual time elapsed {}ms", waitForMs, timeElapsed(timeSource, waitStart, MILLISECONDS));
+ }
+
+ // Try again to find an available session
+ sw = getAvailableSession(zkVersion, oldestUpdateTimeNs);
+
+ if (sw != null) {
if (log.isDebugEnabled()) {
- log.debug("out of waiting curr-time:{} time-elapsed {}"
- , time(timeSource, MILLISECONDS), timeElapsed(timeSource, waitStart, MILLISECONDS));
- }
- // now this thread has woken up because it got timed out after 10 seconds or it is notified after
- // the session was returned from another COMPUTING operation
- if (this.sessionWrapper.status == Status.UNUSED || this.sessionWrapper.status == Status.EXECUTING) {
- log.debug("Wait over. reusing the existing session ");
- this.sessionWrapper.status = Status.COMPUTING;
- return sessionWrapper;
- } else {
- //create a new Session
- return createSession(cloudManager);
+ log.debug("Wait over. reusing an existing session {}", sw.getCreateTime());
}
+ return sw;
+ } else {
+ return createSession(cloudManager);
}
+ } else {
+ return createSession(cloudManager);
}
}
}
+ /**
+ * Returns an available session from the cache (the best one once cache strategies are defined), or null if no session
+ * from the cache is available (i.e. all are still COMPUTING, are too old, wrong zk version or the cache is empty).<p>
+ * This method must be called while holding the monitor on {@link #lockObj}.<p>
+ * The method updates the session status to computing.
+ */
+ private SessionWrapper getAvailableSession(int zkVersion, long oldestUpdateTimeNs) {
+ for (SessionWrapper sw : sessionWrapperSet) {
+ if (sw.status == Status.EXECUTING && sw.getLastUpdateTime() >= oldestUpdateTimeNs && sw.zkVersion == zkVersion) {
+ sw.status = Status.COMPUTING;
+ return sw;
+ }
+ }
+ return null;
+ }
+
+ /**
+ * Returns true if there's a session in the cache that could be returned (if it was free). This is required to
+ * know if there's any point in waiting or if a new session should better be created right away.
+ */
+ private boolean hasNonExpiredSession(int zkVersion, long oldestUpdateTimeNs) {
Review comment:
Do we know how many sessions we might have at any given time? Could this be expensive? I suppose it guarantees savings of 1-10 seconds in cases where allowWait is true and there's nothing worth waiting for; just wondering what average case scenario is
##########
File path: solr/solrj/src/java/org/apache/solr/client/solrj/cloud/autoscaling/PolicyHelper.java
##########
@@ -429,87 +440,124 @@ private void release(SessionWrapper sessionWrapper) {
* The session can be used by others while the caller is performing operations
*/
private void returnSession(SessionWrapper sessionWrapper) {
- TimeSource timeSource = sessionWrapper.session != null ? sessionWrapper.session.cloudManager.getTimeSource() : TimeSource.NANO_TIME;
+ boolean present;
synchronized (lockObj) {
sessionWrapper.status = Status.EXECUTING;
- if (log.isDebugEnabled()) {
- log.debug("returnSession, curr-time {} sessionWrapper.createTime {}, this.sessionWrapper.createTime {} "
- , time(timeSource, MILLISECONDS),
- sessionWrapper.createTime,
- this.sessionWrapper.createTime);
- }
- if (sessionWrapper.createTime == this.sessionWrapper.createTime) {
- //this session was used for computing new operations and this can now be used for other
- // computing
- this.sessionWrapper = sessionWrapper;
+ present = sessionWrapperSet.contains(sessionWrapper);
- //one thread who is waiting for this need to be notified.
- lockObj.notify();
- } else {
- log.debug("create time NOT SAME {} ", SessionWrapper.DEFAULT_INSTANCE.createTime);
- //else just ignore it
- }
+ // wake up single thread waiting for a session return (ok if not woken up, wait is short)
+ lockObj.notify();
}
+ // Logging
+ if (present) {
+ if (log.isDebugEnabled()) {
+ log.debug("returnSession {}", sessionWrapper.getCreateTime());
+ }
+ } else {
+ log.warn("returning unknown session {} ", sessionWrapper.getCreateTime());
+ }
}
- public SessionWrapper get(SolrCloudManager cloudManager) throws IOException, InterruptedException {
+ public SessionWrapper get(SolrCloudManager cloudManager, boolean allowWait) throws IOException, InterruptedException {
Review comment:
Wrote up a *slightly* different implementation here: https://gist.github.com/megancarey/ae2bad53d320ef660ef45c8b003901e1
No more redundant code but I suppose worse in terms of memory, since it makes a recursive call
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