Gopal V created HIVE-20999:
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Summary: LLAP IO: MutableQuantiles is contended heavily
Key: HIVE-20999
URL: https://issues.apache.org/jira/browse/HIVE-20999
Project: Hive
Issue Type: Bug
Components: llap
Affects Versions: 3.1.1
Reporter: Gopal V
MutableQuantiles::add() is synchronized across all threads.
{code}
IO-Elevator-Thread-0 [DAEMON] State: BLOCKED CPU usage on sample: 316ms
org.apache.hadoop.metrics2.lib.MutableQuantiles.add(long)
MutableQuantiles.java:133
org.apache.hadoop.hive.llap.metrics.LlapDaemonIOMetrics.addDecodeBatchTime(long)
LlapDaemonIOMetrics.java:98
org.apache.hadoop.hive.llap.io.decode.EncodedDataConsumer.consumeData(EncodedColumnBatch)
EncodedDataConsumer.java:89
org.apache.hadoop.hive.llap.io.decode.EncodedDataConsumer.consumeData(Object)
EncodedDataConsumer.java:34
org.apache.hadoop.hive.ql.io.orc.encoded.EncodedReaderImpl.readEncodedColumns(int,
StripeInformation, OrcProto$RowIndex[], List, List, boolean[], boolean[],
Consumer) EncodedReaderImpl.java:530
org.apache.hadoop.hive.llap.io.encoded.OrcEncodedDataReader.performDataRead()
OrcEncodedDataReader.java:407
{code}
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