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From Hemal Parekh <he...@bitscopic.com>
Subject Concurrent phoenix queries throw unable to create new native thread error
Date Wed, 10 Oct 2018 15:59:40 GMT
We have an analytical application running concurrent phoenix queries
against Hortonworks HDP 2.6 cluster. Application uses phoenix JDBC
connection to run queries. Often times, concurrent queries fail with
"java.lang.OutOfMemoryError: unable to create new native thread" error.
JDBC connection sets following phoenix properties.

connectionProps.setProperty("phoenix.query.threadPoolSize", "2000")
connectionProps.setProperty("phoenix.query.querySize", "40000")

Phoenix version is 4.7 and Hbase version is 1.1.2, The HDP cluster has six
regionservers on six data nodes. Concurrent queries run against different
phoenix tables, some are small having few million records and some are big
having few billions records. Most of the queries do not have joins,  where
clause includes conditions on rowkey and few nonkey columns. Queries with
joins (which are on small tables) have used USE_SORT_MERGE_JOIN hint.

Are there other phoenix properties which need to be set on JDBC connection?
Are above values for phoenix.query.threadPoolSize and phoenix.query.querySize
enough to handle concurrent query use case? We have changed these two
properties couple of times to increase their values but the error still
remains the same.


Thanks,

Hemal Parekh

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