Todd Lipcon created KUDU-2356:
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Summary: Idle WALs can consume significant memory
Key: KUDU-2356
URL: https://issues.apache.org/jira/browse/KUDU-2356
Project: Kudu
Issue Type: Improvement
Components: log, tserver
Affects Versions: 1.7.0
Reporter: Todd Lipcon
Attachments: heap.svg
I grabbed a heap sample of a tserver which has been running a write workload
for a little while and found that 750MB of memory is used by faststring
allocations inside WritableLogSegment::WriteEntryBatch. It seems like this is
the 'compress_buf_' member. This buffer always resizes up during a log write
but never shrinks back down, even when the WAL is idle. We should consider
clearing the buffer after each append, or perhaps after a short timeout like
100ms after a WAL becomes idle.
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