@Override
public Map<String, Double> getActiveSegmentCompressionRatios() {
Map<String, Double> segmentRatios = new TreeMap<>();
for (CommitLogSegment segment : allocator.getActiveSegments())
segmentRatios.put(segment.getName(), 1.0 * segment.onDiskSize() / segment.contentSize());
return segmentRatios;
}
/**
* Modifies the per-CF dirty cursors of any commit log segments for the column family according to
* the position given. Discards any commit log segments that are no longer used.
*
* @param cfId the column family ID that was flushed
* @param context the replay position of the flush
*/
public void discardCompletedSegments(final UUID cfId, final ReplayPosition context) {
logger.trace("discard completed log segments for {}, table {}", context, cfId);
// Go thru the active segment files, which are ordered oldest to newest, marking the
// flushed CF as clean, until we reach the segment file containing the ReplayPosition passed
// in the arguments. Any segments that become unused after they are marked clean will be
// recycled or discarded.
for (Iterator<CommitLogSegment> iter = allocator.getActiveSegments().iterator();
iter.hasNext(); ) {
CommitLogSegment segment = iter.next();
segment.markClean(cfId, context);
if (segment.isUnused()) {
logger.trace("Commit log segment {} is unused", segment);
allocator.recycleSegment(segment);
} else {
logger.trace(
"Not safe to delete{} commit log segment {}; dirty is {}",
(iter.hasNext() ? "" : " active"),
segment,
segment.dirtyString());
}
// Don't mark or try to delete any newer segments once we've reached the one containing the
// position of the flush.
if (segment.contains(context)) break;
}
}
/** Forces a disk flush on the commit log files that need it. Blocking. */
public void sync(boolean syncAllSegments) {
CommitLogSegment current = allocator.allocatingFrom();
for (CommitLogSegment segment : allocator.getActiveSegments()) {
if (!syncAllSegments && segment.id > current.id) return;
segment.sync();
}
}
/**
* Used by tests.
*
* @return the number of active segments (segments with unflushed data in them)
*/
public int activeSegments() {
return allocator.getActiveSegments().size();
}
@Override
public long getActiveContentSize() {
long size = 0;
for (CommitLogSegment segment : allocator.getActiveSegments()) size += segment.contentSize();
return size;
}
public List<String> getActiveSegmentNames() {
List<String> segmentNames = new ArrayList<>();
for (CommitLogSegment segment : allocator.getActiveSegments())
segmentNames.add(segment.getName());
return segmentNames;
}