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[IMPALA-6785] Starting an Impalad on an already running cluster may result in inconsistent cluster subscription - Impala - [issue]
...After starting a couple of Impala daemons on an already running cluster without restarting the Statestore I noticed that queries are no running against the newly starts daemons.Checking the ...    Author: Mostafa Mokhtar , 2018-09-06, 23:01
[IMPALA-3638] Remove lazy creation of LLVM codegen module - Impala - [issue]
...Queryselect *FROM (  SELECT Rank() OVER (      ORDER BY l_extendedprice        ,l_quantity        ,l_discount      ...    Author: Mostafa Mokhtar , 2018-08-30, 18:50
[IMPALA-4172] Switch from using getFileBlockLocations to BlockLocation methods (Potential 50% speedup in metadata loading) - Impala - [issue]
...HDFS-8895 removes the ability to query volume IDs from datanodes. This information has instead been added to BlockLocation, which is accessible via various FileSystem APIs (namely, anything ...    Author: Mostafa Mokhtar , 2018-08-30, 18:26
[IMPALA-2523] Make HdfsTableSink aware of clustered input - Impala - [issue]
...The HdfsParquetTableWriter needs to be aware that incoming data is clustered if the corresponding insert statement has a "clustered" hint. Only a single open partition should be maintained a...    Author: Mostafa Mokhtar , 2018-08-30, 18:08
[IMPALA-6852] Add a section to the query profile covering number of fragments and total bytes scanned per host - Impala - [issue]
...Root causing performance issues usually comes down to skew in terms of work done across hosts. Un-even assignment of fragments or bytes scanned per host is a common.Making this information r...    Author: Mostafa Mokhtar , 2018-08-20, 19:51
[IMPALA-6403] Enable file handle reuse for multiple scan ranges within the same file for an HDFS Scan node - Impala - [issue]
...Impala creates a file handle per scan range, for queries that read multiple columns per scan range un-necessarily large load is added to the HDFS NameNode which limits scalability on large c...    Author: Mostafa Mokhtar , 2018-08-14, 17:47
[IMPALA-6034] Add query option that limits scanned bytes at runtime - Impala - [issue]
...Reject queries that scans large data before executing the query.This is a mechanism to protect the cluster from potentially harmful queries.MAX_READ_BYTES: [0]...    Author: Mostafa Mokhtar , 2018-08-09, 22:30
[IMPALA-7221] While reading from object store S3/ADLS at +500MB/sec TypeArrayKlass::allocate_common becomes a CPU bottleneck - Impala - [issue]
...From PerfSamples: 1M of event 'cpu-clock', Event count (approx.): 320058500000  Children      Self  Command         Shared Object     &...    Author: Mostafa Mokhtar , 2018-08-07, 18:18
[IMPALA-6671] Metadata operations that modify a table blocks topic updates for other unrelated operations - Impala - [issue]
...Metadata operations that mutate the state of a table like "compute stats foo" or "alter recover partitions" block topic updates for read only operations against unrelated tables as "describe...    Author: Mostafa Mokhtar , 2018-08-01, 20:41
[IMPALA-3118] Bucketed table support - Impala - [issue]
...Bucketed tables are hash partitioned which means joins and aggregations bucketing columns can be done without exchange...    Author: Mostafa Mokhtar , 2018-07-26, 16:11