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https://issues.apache.org/jira/browse/KUDU-2356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16814619#comment-16814619
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Grant Henke commented on KUDU-2356:
-----------------------------------
Here is the original change that got reverted:
https://gerrit.cloudera.org/#/c/9747/
> 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
> Priority: Major
> 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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