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Request disk consistent LSN through safekeeper

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This commit is contained in:
Konstantin Knizhnik
2021-09-21 15:53:50 +03:00
parent ae2232641d
commit bf5d17cbaa
5 changed files with 211 additions and 136 deletions
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136
pageserver/src/layered_repository.rs
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@@ -1175,81 +1175,71 @@ impl LayeredTimeline {
);
}
loop {
// Do we have a layer open for writing already?
if let Some(layer) = layers.get_open(&seg) {
if layer.get_start_lsn() > lsn {
bail!("unexpected open layer in the future");
}
return Ok(layer);
// Do we have a layer open for writing already?
if let Some(layer) = layers.get_open(&seg) {
if layer.get_start_lsn() > lsn {
bail!("unexpected open layer in the future");
}
// No (writeable) layer for this relation yet. Create one.
//
// Is this a completely new relation? Or the first modification after branching?
//
let layer;
if let Some((prev_layer, _prev_lsn)) =
self.get_layer_for_read_locked(seg, lsn, &layers)?
{
// Create new entry after the previous one.
let start_lsn;
if prev_layer.get_timeline_id() != self.timelineid {
// First modification on this timeline
start_lsn = self.ancestor_lsn;
trace!(
"creating file for write for {} at branch point {}/{}",
seg,
self.timelineid,
start_lsn
);
} else {
start_lsn = prev_layer.get_end_lsn();
trace!(
"creating file for write for {} after previous layer {}/{}",
seg,
self.timelineid,
start_lsn
);
}
trace!(
"prev layer is at {}/{} - {}",
prev_layer.get_timeline_id(),
prev_layer.get_start_lsn(),
prev_layer.get_end_lsn()
);
layer = InMemoryLayer::create_successor_layer(
self.conf,
prev_layer,
self.timelineid,
self.tenantid,
start_lsn,
lsn,
)?;
} else {
// New relation.
trace!(
"creating layer for write for new rel {} at {}/{}",
seg,
self.timelineid,
lsn
);
layer = InMemoryLayer::create(
self.conf,
self.timelineid,
self.tenantid,
seg,
lsn,
lsn,
)?;
}
let layer_rc: Arc<InMemoryLayer> = Arc::new(layer);
layers.insert_open(Arc::clone(&layer_rc));
return Ok(layer_rc);
return Ok(layer);
}
// No (writeable) layer for this relation yet. Create one.
//
// Is this a completely new relation? Or the first modification after branching?
//
let layer;
if let Some((prev_layer, _prev_lsn)) = self.get_layer_for_read_locked(seg, lsn, &layers)? {
// Create new entry after the previous one.
let start_lsn;
if prev_layer.get_timeline_id() != self.timelineid {
// First modification on this timeline
start_lsn = self.ancestor_lsn;
trace!(
"creating file for write for {} at branch point {}/{}",
seg,
self.timelineid,
start_lsn
);
} else {
start_lsn = prev_layer.get_end_lsn();
trace!(
"creating file for write for {} after previous layer {}/{}",
seg,
self.timelineid,
start_lsn
);
}
trace!(
"prev layer is at {}/{} - {}",
prev_layer.get_timeline_id(),
prev_layer.get_start_lsn(),
prev_layer.get_end_lsn()
);
layer = InMemoryLayer::create_successor_layer(
self.conf,
prev_layer,
self.timelineid,
self.tenantid,
start_lsn,
lsn,
)?;
} else {
// New relation.
trace!(
"creating layer for write for new rel {} at {}/{}",
seg,
self.timelineid,
lsn
);
layer =
InMemoryLayer::create(self.conf, self.timelineid, self.tenantid, seg, lsn, lsn)?;
}
let layer_rc: Arc<InMemoryLayer> = Arc::new(layer);
layers.insert_open(Arc::clone(&layer_rc));
return Ok(layer_rc);
}
///