Each test case in ExternalScanContextMgrTest may cost 1 minitue
which is too long, we'd better disable backgrounp scan context
gc to speed up unit test.
The callback added to the CallbackFactory should not be removed until the
transaction is aborted or visible. Otherwise, some callback method may failed
to be called.
When BE sets `ignore_broken_disk` to true, it's expected that non-exist path in storage_root_path won't prevent BE from launching, but in 0.12 BE fails to launch in such scenario.
```
W0506 14:46:11.039953 17040 options.cpp:64] path can not be canonicalized. may be not exist. path=/data11/olap
W0506 14:46:11.040014 17040 options.cpp:141] failed to parse store path /data11/olap, res=-203
```
The reason is that #2861 adds a path existence check in `parse_root_path` which precedes the usage of `ignore_broken_disk` in the main method.
ImplementaItion Notes
NodeChannel
_cur_batch -> _pending_batches: when _cur_batch is filled up, move it to _pending_batches.
add_row() just produce batches.
try_send_and_fetch_status() tries to consume one pending batch. If has in flight packet, skip send in this round.
So we can add one sender thread to be in charge of all node channels try_send.
IndexChannel
init(), open() stay the same.
Use for_each_node_channel() to expose the detailed changes of NodeChannel.(It's more easy to read & modify)
Sender thread
See func OlapTableSink::_send_batch_process()
Why use polling？
If we use wait/notify, it will notify when generate a new batch. We can't skip sending this batch, coz it won't notify the same batch again. So wait/notify can't avoid blocking simply.
So I choose polling.
It's wasting to continuously try_send(), but it's difficult to set the suitable polling interval. Thus, I add std::this_thread::yield() to give up the time slice, give priority to other process/threads (if there are other process/threads waiting in the queue).
RandomAccessFileOptions, WritableFileOptions, RandomRWFileOptions
defined as a struct but previously declared as a class; this is valid,
but will result in compile warning or error under clang compiler
For SQL like:
```
select * from
join1 left semi join join2
on join1.id = join2.id and join2.id > 1;
```
the predicate `join2.id > 1` can not be pushed down to table join1.
1. reserve `SegmentWriter::_column_writers` before writing it
2. remove some condition branchs in SegmentWriter::init
3. fix hard-coded library names in build-thirdpary.sh
Add a new config `drop_backend_after_decommission` in FE. if this config
is false, the BE will not be dropped after finishing decommission operation.
This new config is try to solve the problem described in ISSUE: #3460 .
TODO:
This method will generate a lot of data migration, so it is only a temporary solution.
After that, we should try to solve the problem of data balancing within the BE.
This CL also add the documents of FE and BE configuration.
These documents are incomplete and can be added later.
When there is subquery in where clause, the query will be rewritten to join operation.
And some auxiliary binary predicates will be generated. These binary predicates
will not go through the ExprRewriteRule, so they are not normalized as
"column to the left and constant to the right" format.
We need to take this case into account so that the `canPushDownPredicate()` judgement
will not throw exception.
Current implement is very simply and conservative, because our query planner is error-prone.
After we implement the new query planner, we could do this work by `Predicate Equivalence Class` and `PredicatePushDown` rule like presto.
The resource pool in runtime state will be automatically unregistered
when deconstructing the RuntimeState. So no need to unregister it when
closing the plan fragment executor.
* [Fix] Fix bug that rowset meta is deleted after compaction
After compaction, the tablet rowset meta will be modified by
adding to new output rowsets and deleting the old input rowsets.
The output version may equals to the input version.
So we should delete the "input" version from _rs_version_map
before adding the "output" version to _rs_version_map. Otherwise,
the new "output" version will be lost in _rs_version_map.
Adding a new storage engine, we need to make an extensible tablet interface, so olap/StorageEngine can support and manage new tablet types.
To start, this commit creates a class BaseTablet and make Tablet and new MemTablet inherit
this base class, some common fields & methods are moved to BaseTablet class, which fields
and methods belong to base/old class is not finalized yet, it will change as the project evolves.
Fix#3384
Use `String.getBytes().length` instead of `String.length()` to get the real byte length of a string.
Fix: #3443
Also fix the typo of `max_filter_ratio` in audit log plugin.
This CL mainly made the following modifications:
1. Delete Invalid MemoryUsed Counter and Add PeakMemUsage in each exec node and datastreamsender
2. Add intent in child execnode profile，make it is easily to know the relationship between execnode
3. Del _is_result_order we not support any more in olap_scan_node.h and olap_scan_node.cpp
4. Add scan_disk method to olap_scanner to fix the counter _num_disks_accessed_counter
5. Now we do not use buffer pool to read and write disk, so annotation eadio counter and
6. Delete the MemUsed counter in exec node.
