Arina Ielchiieva created DRILL-4823: ---------------------------------------
Summary: Fix OOM while trying to prune partitions with reasonable data size Key: DRILL-4823 URL: https://issues.apache.org/jira/browse/DRILL-4823 Project: Apache Drill Issue Type: Bug Components: Functions - Drill, Query Planning & Optimization Affects Versions: 1.6.0 Reporter: Arina Ielchiieva Assignee: Arina Ielchiieva Fix For: 1.8.0 _Example query:_ {code:sql} select '/'||dir0||'/'||dir1||'/'||dir2||'/'||dir3 , count(*) FROM dfs.`/path/to/parquet/files` WHERE ('/'||dir0||'/'||dir1||'/'||dir2||'/'||dir3) IN ( '/2015/11/30', '//2015/09/01', '/2015/09/02', '/2015/09/03', '/2015/09/04', '/2015/09/09', '/2016/03/30' ) group by '/'||dir0||'/'||dir1||'/'||dir2||'/'||dir3 order by 1; {code} _Error:_ OOM while trying to prune partitions: {noformat} org.apache.drill.exec.exception.OutOfMemoryException: Unable to allocate buffer of size 256 due to memory limit. Current allocation: 5242880 at org.apache.drill.exec.memory.BaseAllocator.buffer(BaseAllocator.java:216) ~[drill-memory-base-1.6.0.jar:1.6.0] at org.apache.drill.exec.ops.BufferManagerImpl.getManagedBuffer(BufferManagerImpl.java:60) ~[drill-java-exec-1.6.0.jar:1.6.0] at org.apache.drill.exec.ops.BufferManagerImpl.getManagedBuffer(BufferManagerImpl.java:56) ~[drill-java-exec-1.6.0.jar:1.6.0] at org.apache.drill.exec.ops.QueryContext.getManagedBuffer(QueryContext.java:241) ~[drill-java-exec-1.6.0.jar:1.6.0] at org.apache.drill.exec.expr.fn.interpreter.InterpreterEvaluator$EvalVisitor.getManagedBufferIfAvailable(InterpreterEvaluator.java:158) ~[drill-java-exec-1.6.0.jar:1.6.0] {noformat} _Cause:_ Interpreter always asks for a new buffer to hold varchar/varbinary or decimal constant values. That's why the memory size required would be proportion to # of constant expressions multiplied by # of input rows (partition). This is different from evaluation from run-time generated where constant expression will be evaluated once and use only one buffer per value. _Fix:_ To use one buffer for each unique constant value in query. -- This message was sent by Atlassian JIRA (v6.3.4#6332)