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From "Impala Public Jenkins (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-5407: Fix crash in HdfsSequenceTableWriter
Date Wed, 19 Jul 2017 06:48:06 GMT
Impala Public Jenkins has submitted this change and it was merged.

Change subject: IMPALA-5407: Fix crash in HdfsSequenceTableWriter

IMPALA-5407: Fix crash in HdfsSequenceTableWriter

The following use of sequence file writer can lead to a crash:
> set compression_codec=gzip;
> set seq_compression_mode=record;
> set allow_unsupported_formats=1;
> create table seq_tbl like tbl stored as sequencefile;
> insert into seq_tbl select * from tbl;

This fix removes the MemPool::FreeAll() call from
HdfsSequenceTableWriter::Flush(). Freeing the memory pool in Flush()
is incorrect because a memory pool buffer is cached by the compressor
in the table writer which isn't reset across calls to Flush().

If the file that is being written is big enough,
HdfsSequenceTableWriter::AppendRows() will call Flush() multiple
times causing memory corruption.

Change-Id: Ida0b9f189175358ae54149d0e1af7caa06ae3bec
Reviewed-by: Michael Ho <>
Tested-by: Impala Public Jenkins
M be/src/exec/
M testdata/workloads/functional-query/queries/QueryTest/seq-writer.test
2 files changed, 18 insertions(+), 1 deletion(-)

  Impala Public Jenkins: Verified
  Michael Ho: Looks good to me, approved

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Gerrit-MessageType: merged
Gerrit-Change-Id: Ida0b9f189175358ae54149d0e1af7caa06ae3bec
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Attila Jeges <>
Gerrit-Reviewer: Attila Jeges <>
Gerrit-Reviewer: Impala Public Jenkins
Gerrit-Reviewer: Michael Ho <>

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