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From "Juan Yu (Code Review)" <>
Subject [Impala-CR](cdh5-trunk) IMPALA-3575: Add retry to backend connection request and rpc timeout
Date Mon, 20 Jun 2016 23:57:09 GMT
Juan Yu has posted comments on this change.

Change subject: IMPALA-3575: Add retry to backend connection request and rpc timeout

Patch Set 9:

(1 comment)
File be/src/runtime/

PS9, Line 216: ONE_HOUR_IN_MS
> How was one hour chosen? I'm worried this might cause lot of queries to han
yes, that could happen. but we don't want very short timeout here. upstream operator sometimes
could take very long time and I don't know how long it could be. 
This is like the last mean to detect the pair node failure. In most of cases, the dest node
failure will be detected by statestore heartbeat and the query will be cancelled before hitting
this timeout.

RPC_TIMEOUT error is checked by IsTimeoutTException(), only if the error contains "EAGAIN
(timed out)".
It happens only on TSocket::read()

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Gerrit-MessageType: comment
Gerrit-Change-Id: Id6723cfe58df6217f4a9cdd12facd320cbc24964
Gerrit-PatchSet: 9
Gerrit-Project: Impala
Gerrit-Branch: cdh5-trunk
Gerrit-Owner: Juan Yu <>
Gerrit-Reviewer: Alan Choi <>
Gerrit-Reviewer: Dan Hecht <>
Gerrit-Reviewer: Henry Robinson <>
Gerrit-Reviewer: Juan Yu <>
Gerrit-Reviewer: Sailesh Mukil <>
Gerrit-HasComments: Yes

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