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https://issues.apache.org/jira/browse/OAK-7838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig resolved OAK-7838.
--------------------------------
Resolution: Fixed
Fixed at Fixed at http://svn.apache.org/viewvc?rev=1845234&view=rev
> oak-run check crashes JVM
> -------------------------
>
> Key: OAK-7838
> URL: https://issues.apache.org/jira/browse/OAK-7838
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: run, segment-tar
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Priority: Major
> Labels: candidate_oak_1_8
> Fix For: 1.10
>
>
> I had a case where running {{oak-run check}} on a repository with many
> revisions would reliably crash the JVM.
> Apparently there is a problem with the {{Scheduler}} instances in
> {{org.apache.jackrabbit.oak.segment.CommitsTracker}}: when many instances of
> that class are created in fast succession it will leave many daemon threads
> lingering around for a while. In my case this was sufficient to kill the JVM.
> To verify I simply removed the scheduler and everything was just fine:
> {code}
> ===================================================================
> ---
> oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/CommitsTracker.java
> (date 1539358293000)
> +++
> oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/CommitsTracker.java
> (date 1539670356000)
> @@ -19,8 +19,6 @@
> package org.apache.jackrabbit.oak.segment;
> -import static java.util.concurrent.TimeUnit.MINUTES;
> -
> import java.io.Closeable;
> import java.util.HashMap;
> import java.util.Map;
> @@ -29,7 +27,6 @@
> import java.util.stream.Stream;
> import com.googlecode.concurrentlinkedhashmap.ConcurrentLinkedHashMap;
> -import org.apache.jackrabbit.oak.segment.file.Scheduler;
> /**
> * A simple tracker for the source of commits (writes) in
> @@ -49,7 +46,6 @@
> private final ConcurrentMap<String, Long> commitsCountPerThreadGroup;
> private final ConcurrentMap<String, Long> commitsCountOtherThreads;
> private final ConcurrentMap<String, Long>
> commitsCountPerThreadGroupLastMinute;
> - private final Scheduler commitsTrackerScheduler = new
> Scheduler("CommitsTracker background tasks");
> CommitsTracker(String[] threadGroups, int otherWritersLimit, boolean
> collectStackTraces) {
> this.threadGroups = threadGroups;
> @@ -60,8 +56,6 @@
> .maximumWeightedCapacity(otherWritersLimit).build();
> this.queuedWritersMap = new ConcurrentHashMap<>();
> - commitsTrackerScheduler.scheduleWithFixedDelay("TarMK commits
> tracker stats resetter", 1, MINUTES,
> - this::resetStatistics);
> }
> public void trackQueuedCommitOf(Thread t) {
> @@ -112,7 +106,7 @@
> @Override
> public void close() {
> - commitsTrackerScheduler.close();
> +
> }
> {code}
> cc [~dulceanu]
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