Change in ovirt-engine[master]: webadmin: Avoid duplicate server [Search] queries

[gchaplik at redhat.com]

Gilad Chaplik has submitted this change and it was merged.

Change subject: webadmin: Avoid duplicate server [Search] queries
......................................................................


webadmin: Avoid duplicate server [Search] queries

While executing several queries in parallel, the UI gets stuck;
There is a hard limitation of ~6 connections
for http requests (for the same host name).

We are getting a lot of performance issues that are related to it.
The main reproducer to 'UI not responding' is
re-sending a 'slow' query and run out of connections.

For a large scale env, this can be a serious problem;

Currently we support only search queries because it's easy to identify
them; i.e., according to search string and sender, whereas other queries,
are pretty hard to compare, because 'equals' isn't implemented in
parameters classes.

In the patch:
When sending a second duplicate request from the same
place (model, queryType and parameters),
while the first request is waiting for response,
we will postpone it till the first is finished.
NOTE: we will postpone (save) only a single request, and avoid the others;
e.g., when pressing 30 time on a key in the GUI the first one will
be excuted and the others will pile up on the same place in the set.

Change-Id: I483a1c449f1eb2e9820464dbaf0a686f90923bb6
Signed-off-by: Gilad Chaplik <gchaplik at redhat.com>
---
M frontend/webadmin/modules/frontend/src/main/java/org/ovirt/engine/ui/frontend/Frontend.java
1 file changed, 121 insertions(+), 33 deletions(-)

Approvals:
  Gilad Chaplik: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: I483a1c449f1eb2e9820464dbaf0a686f90923bb6
Gerrit-PatchSet: 8
Gerrit-Project: ovirt-engine
Gerrit-Branch: master
Gerrit-Owner: Gilad Chaplik <gchaplik at redhat.com>
Gerrit-Reviewer: Alona Kaplan <alkaplan at redhat.com>
Gerrit-Reviewer: Daniel Erez <derez at redhat.com>
Gerrit-Reviewer: Einav Cohen <ecohen at redhat.com>
Gerrit-Reviewer: Gilad Chaplik <gchaplik at redhat.com>
Gerrit-Reviewer: Kanagaraj M <kmayilsa at redhat.com>
Gerrit-Reviewer: Liron Aravot <laravot at redhat.com>
Gerrit-Reviewer: Vojtech Szocs <vszocs at redhat.com>
Gerrit-Reviewer: Yair Zaslavsky <yzaslavs at redhat.com>