[geomesa-users] number of threads constantly increasing

["GRISOT, REMI" <remi.grisot@xxxxxxxx>]

Hello,

I'm using Geomesa to store large amount of data, and I noticed that while the insertion is running, the number of threads run by the application is constantly increasing (especially those named "BatchWriterLatencyTimer", see picture attached). After looking into the JConsole, it seems that these threads are created in the file AccumuloBackedMetadata.scala (https://github.com/locationtech/geomesa/blob/master/geomesa-accumulo/geomesa-accumulo-datastore/src/main/scala/org/locationtech/geomesa/accumulo/data/AccumuloBackedMetadata.scala) which through the method "write", call an Accumulo method creating the threads (https://github.com/Sciumo/Accumulo/blob/master/src/core/src/main/java/org/apache/accumulo/core/client/impl/TabletServerBatchWriter.java).
On a big insertion (billions of points), the number of threads was so high it caused an OutOfMemoryError, as no more threads could be created.

Do you have any idea of what could prevent this behavior?

Thank you.

Rémi Grisot

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