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https://issues.apache.org/jira/browse/CASSANDRA-12979?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15726613#comment-15726613
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Sotirios Delimanolis commented on CASSANDRA-12979:
--------------------------------------------------
+1
We hit this issue recently. A huge set of sstables couldn't get compacted.
We've been running a version of this patch (just more logging) in production
for a couple of days and it unblocks these compactions.
I suggest you open a separate ticket for the {{RuntimeException}}, though.
Nothing is currently set up to handle it right now. It doesn't even get logged.
I assume that's why this issue wasn't identified sooner.
> checkAvailableDiskSpace doesn't update expectedWriteSize when reducing thread
> scope
> -----------------------------------------------------------------------------------
>
> Key: CASSANDRA-12979
> URL: https://issues.apache.org/jira/browse/CASSANDRA-12979
> Project: Cassandra
> Issue Type: Bug
> Reporter: Jon Haddad
> Assignee: Jon Haddad
> Fix For: 2.2.9, 3.0.11, 4.0, 3.x
>
>
> If a compaction occurs that looks like it'll take up more space than
> remaining disk available, the compaction manager attempts to reduce the scope
> of the compaction by calling {{reduceScopeForLimitedSpace()}} repeatedly.
> Unfortunately, the while loop passes the {{estimatedWriteSize}} calculated
> from the original call to {{hasAvailableDiskSpace}}, so the comparisons that
> are done will always be against the size of the original compaction, rather
> than the reduced scope one.
> Full method below:
> {code}
> protected void checkAvailableDiskSpace(long estimatedSSTables, long
> expectedWriteSize)
> {
> if(!cfs.isCompactionDiskSpaceCheckEnabled() && compactionType ==
> OperationType.COMPACTION)
> {
> logger.info("Compaction space check is disabled");
> return;
> }
> while (!getDirectories().hasAvailableDiskSpace(estimatedSSTables,
> expectedWriteSize))
> {
> if (!reduceScopeForLimitedSpace())
> throw new RuntimeException(String.format("Not enough space
> for compaction, estimated sstables = %d, expected write size = %d",
> estimatedSSTables, expectedWriteSize));
>
> }
> }
> {code}
> I'm proposing to recalculate the {{estimatedSSTables}} and
> {{expectedWriteSize}} after each iteration of {{reduceScopeForLimitedSpace}}.
>
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