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[IMPALA-5485] Exchg / data-stream recv-side buffers should operate under a memory reservation
...Exchange nodes assign a fixed-size buffer to their datastream receivers that's used to smooth out differences in send / consume rates between the sender and the receiver.These buffers should...
, 2018-08-13, 22:45
[IMPALA-3189] Address scalability issue with N^2 KDC requests on cluster startup
...When Impala runs a query that shuffles data amongst all nodes in a Kerberos-secured cluster, every node will need to acquire a TGS for every other node. In a cluster of 100 nodes or more, th...
, 2018-08-10, 00:12
[IMPALA-4979] Port CatalogService to KRPC
, 2018-08-10, 00:03
[IMPALA-3882] Fix some locking / concurrency issues in ImpalaServer and QueryExecState
...Three related things can be improved fairly easily in QueryExecState. I found these when debugging hangs in the debug web pages during query planning. 1. Don't hold the lock during GetExecRe...
, 2018-07-26, 22:04
[IMPALA-2567] KRPC milestone 1
...Impala relies on Thrift 0.9.X for its RPC implementation. This is a venerable release and is showing its age. Problems include: Low-quality SASL support (that we implemented ourselves) Lack ...
, 2018-07-24, 18:01
[IMPALA-4953] Prevent large statestore updates from head-of-line blocking subsequent updates to different topics
...The statestore currently tries to send all its topic updates to a particular host at the same time. If a topic update is very large (e.g. large metadata change) that can delay the receipt of...
, 2018-07-16, 21:32
[IMPALA-4784] Remove InProcessStatestore
...The InProcessStatestore class is only used by the statestore-test and is likely to be obsoleted by the KRPC work. Since statestore-test doesn't provide much test coverage at all, let's remov...
, 2018-07-16, 00:26
[IMPALA-3380] Add TCP timeouts to all RPCs that don't block
...Most RPCs should not take an unbounded amount of time to complete (the exception is TransmitData(), but that may also change). To handle hang failures on the remote machine, we should add ti...
, 2018-07-15, 23:22
[IMPALA-4889] Use sidecars for Thrift-wrapped RPC payloads
...When Kudu supports client-side payloads (https://issues.apache.org/jira/browse/KUDU-1866), we should use that for all Thrift-wrapped RPCs to save one copy / serialization step....
, 2018-07-15, 23:16
[IMPALA-5473] Make diagnosing network issues easier
...With our current metrics in the profile, it's hard to debug queries that get slow throughput from their exchanges. The following cases have different causes, but similar symptoms (e.g. a hig...
, 2018-07-15, 23:10
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