[ https://issues.apache.org/jira/browse/HIVE-21391?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
slim bouguerra updated HIVE-21391: ---------------------------------- Attachment: HIVE-21391.2.patch > LLAP: Pool of column vector buffers can cause memory pressure > ------------------------------------------------------------- > > Key: HIVE-21391 > URL: https://issues.apache.org/jira/browse/HIVE-21391 > Project: Hive > Issue Type: Bug > Components: llap > Affects Versions: 4.0.0, 3.2.0 > Reporter: Prasanth Jayachandran > Assignee: slim bouguerra > Priority: Major > Labels: pull-request-available > Attachments: HIVE-21391.1.patch, HIVE-21391.2.patch > > Time Spent: 20m > Remaining Estimate: 0h > > Where there are too many columns (in the order of 100s), with decimal, string > types the column vector pool of buffers created here > [https://github.com/apache/hive/blob/master/llap-server/src/java/org/apache/hadoop/hive/llap/io/decode/EncodedDataConsumer.java#L59] > can cause memory pressure. > Example: > 128 (poolSize) * 300 (numCols) * 1024 (batchSize) * 80 (decimalSize) ~= 3GB > The pool size keeps increasing when there is slow consumer but fast llap io > (SSDs) leading to GC pressure when all LLAP io threads read splits from same > table. -- This message was sent by Atlassian JIRA (v7.6.3#76005)