mirror of https://github.com/apache/cloudstack.git
5c29d5ba45
After a few hours running with InfluxDB configured, CloudStack hangs due to OutOfMemoryException raised. The exception happens at com.cloud.server.StatsCollector.writeBatches(StatsCollector.java:1510):
2020-08-12 21:19:00,972 ERROR [c.c.s.StatsCollector] (StatsCollector-6:ctx-0a4cfe6a) (logid:03a7ba48) Error trying to retrieve host stats
java.lang.OutOfMemoryError: unable to create new native thread
...
at org.influxdb.impl.BatchProcessor.<init>(BatchProcessor.java:294)
at org.influxdb.impl.BatchProcessor$Builder.build(BatchProcessor.java:201)
at org.influxdb.impl.InfluxDBImpl.enableBatch(InfluxDBImpl.java:311)
at com.cloud.server.StatsCollector.writeBatches(StatsCollector.java:1510)
at com.cloud.server.StatsCollector$AbstractStatsCollector.sendMetricsToInfluxdb(StatsCollector.java:1351)
at com.cloud.server.StatsCollector$HostCollector.runInContext(StatsCollector.java:522)
Context on InfluxDB Batch: Enabling batch on InfluxDB is great and speeds writing but it requires caution to avoid Zombie threads.
Solution: This happens because the batching feature creates an internal thread pool that needs to be shut down explicitly; therefore, it is important to add: influxDB.close().
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