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https://issues.apache.org/jira/browse/HDDS-1397?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16814642#comment-16814642
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Hudson commented on HDDS-1397:
------------------------------
SUCCESS: Integrated in Jenkins build Hadoop-trunk-Commit #16375 (See
[https://builds.apache.org/job/Hadoop-trunk-Commit/16375/])
HDDS-1397. Avoid the usage of signal handlers in datanodes of the (elek: rev
dfb518bbf5e67534dd621f89f7c53314873bb282)
* (edit)
hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/HddsDatanodeService.java
> Avoid the usage of signal handlers in datanodes of the MiniOzoneClusters
> ------------------------------------------------------------------------
>
> Key: HDDS-1397
> URL: https://issues.apache.org/jira/browse/HDDS-1397
> Project: Hadoop Distributed Data Store
> Issue Type: Bug
> Reporter: Elek, Marton
> Assignee: Elek, Marton
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> [~arpaga] showed me a problem that TestQueryNode.testHealthyNodesCount is
> failed in the CI check of HDDS-1339.
> According to the logs the test is timed out because only 4 datanodes are
> started out of the 5.
> The log also contained an exception from one datanode:
> {code}
> 2019-04-04 00:26:33,583 WARN ozone.HddsDatanodeService
> (LogAdapter.java:warn(59)) - failed to register any UNIX signal loggers:
> java.lang.IllegalStateException: Can't re-install the signal handlers.
> at org.apache.hadoop.util.SignalLogger.register(SignalLogger.java:77)
> at
> org.apache.hadoop.util.StringUtils.startupShutdownMessage(StringUtils.java:718)
> at
> org.apache.hadoop.util.StringUtils.startupShutdownMessage(StringUtils.java:707)
> at
> org.apache.hadoop.ozone.HddsDatanodeService.createHddsDatanodeService(HddsDatanodeService.java:126)
> at
> org.apache.hadoop.ozone.HddsDatanodeService.createHddsDatanodeService(HddsDatanodeService.java:108)
> at
> org.apache.hadoop.ozone.MiniOzoneClusterImpl$Builder.createHddsDatanodes(MiniOzoneClusterImpl.java:552)
> {code}
> The code which requires the signal handler is the following (signal handler
> is registered in the startupShutdownMessage)
> {code}
> /**
> * Create an Datanode instance based on the supplied command-line arguments.
> * <p>
> * This method is intended for unit tests only. It suppresses the
> * startup/shutdown message and skips registering Unix signal handlers.
> *
> * @param args command line arguments.
> * @param conf HDDS configuration
> * @param printBanner if true, then log a verbose startup message.
> * @return Datanode instance
> */
> private static HddsDatanodeService createHddsDatanodeService(
> String[] args, Configuration conf, boolean printBanner) {
> if (args.length == 0 && printBanner) {
> StringUtils
> .startupShutdownMessage(HddsDatanodeService.class, args, LOG);
> return new HddsDatanodeService(conf);
> } else {
> new HddsDatanodeService().run(args);
> return null;
> }
> {code}
> As you can read from the comment it's expected to be called with
> printBanner=false to avoid the creation of the signal handler.
> Note: In the startupShutdownMessage method a new signal handler is registered
> and signal handlers can be registered only once:
> {code}
> //SignalLogger
> void register(final LogAdapter LOG) {
> if (registered) {
> throw new IllegalStateException("Can't re-install the signal
> handlers.");
> }
> ....
> {code}
> We have a dedicated method to create datanode service for the unit tests. The
> only thing what we need is to turn OFF the signal handler registration here.
> (The following code fragment shows the original state where the signal
> handler creation is requested with the true parameter value)
> {code}
> @VisibleForTesting
> public static HddsDatanodeService createHddsDatanodeService(
> String[] args, Configuration conf) {
> return createHddsDatanodeService(args, conf, true);
> }
> {code}
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