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Does Impala supports or plan to support Late Materialization
- [mail # user]
...@Antoni,Check the blog below, it has examples on how to optimize the schema forselective queries.https://blog.cloudera.com/blog/2017/12/faster-performance-for-selective-queries/On Tue, Mar 2...
, 2018-03-20, 22:35
[IMPALA-6683] Restarting the Catalog without restarting Impalad and SS can block topic updates
...After restarting the Catalog without restarting the other services topic updates are getting stuckFrom SSI0315 17:20:44.305951 120990 statestore.cc:242] Preparing initial catalog-update topi...
, 2018-03-20, 20:44
[IMPALA-6692] When partition exchange is followed by sort each sort node becomes a synchronization point across the cluster
...Issue described in this JIRA applies to Analytical functions Writes to Partitioned Parquet tables Writes to Kudu tablesWhen inserting into a Kudu table from Impala the plan is something lik...
, 2018-03-19, 20:28
[IMPALA-4530] Sort node after exchange should start sorting after first RowBatch is received
...Sort node after exchange doesn't start sorting until all data is received which add lots of latency to the query. Not clear if this optimization would still make sense for a Scan followed by...
, 2018-03-16, 22:12
[IMPALA-6657] Investigate why memory allocation in Exchange receiver node takes a long time
...It was observed while inserting large amounts of data into a Kudu table Exchange operator was running slow, query profile showed a big portion of the time was spent in memory allocation in t...
, 2018-03-16, 21:22
[IMPALA-6684] Large payload going through exchange results in lots of untracked memory in the form of a string
...While running a query that shuffles 1GB rows noticed that there is a large amount of untracked memory in the form of a string, this issue repros with/without KRPC.Tim Armstrong identified th...
, 2018-03-16, 16:45
[IMPALA-6652] KRPC : Data Stream Manager Deferred RPCs in memz page should be renamed
...While loading data into a Kudu table against the latest Impala 2.11.0 I noticed that "Data Stream Manager Deferred RPCs" in the memz isn't accurate. From memz on workerProcess: L...
, 2018-03-15, 22:58
[IMPALA-4302] In-predicate filters do not scale as expected with # of elements constant IN-list
...ExprContext::GetValue is called per item in a constant IN-list which is not needed, this makes in-list predicates >10x slower than an equivalent filter through RuntimeFilter BloomFilter a...
, 2018-03-15, 19:58
[IMPALA-2979] Simple scheduler : Reservoir sampling doesn't provide enough randomization
...It appears with random_non_cached_tiebreak enabled the reservoir sampling doesn't provide enough randomization which can result in hot spots....
, 2018-03-15, 19:57
[IMPALA-6671] Metadata operations that modify a table blocks topic updates for other unrelated operations
...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...
, 2018-03-15, 15:59
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