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HBASE-24195 : Admin.getRegionServers() should return live servers exc… - #1523
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…luding decom RS optionally
Apache-HBase
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Apr 15, 2020
🎊 +1 overall
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Apache-HBase
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Apache-HBase
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liuml07
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Apr 16, 2020
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Looks useful. +1 (non-binding) after comments are addressed.
| waitForServerDecom(serverToDecommission, true); | ||
| Assert.assertEquals(2, ADMIN.getRegionServers(true).size()); | ||
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Add Assert.assertEquals(3, ADMIN.getRegionServers(false).size()); for paranoid reviewers (cough cough me).
| ADMIN.recommissionRegionServer(serverToDecommission, Collections.emptyList()); | ||
| Assert.assertEquals(3, ADMIN.getRegionServers(true).size()); | ||
| waitForServerDecom(serverToDecommission, false); |
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Why wait for decommission this server in the end?
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I was thinking the assertion Assert.assertEquals(3, ADMIN.getRegionServers(true).size()); should have made sure all RS are fine now. I understand in case that is not enough, you explicitly make sure the mini cluster is ready for other test cases. OK, good.
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Why wait for decommission this server in the end?
Actually, we are waiting for server to be recommissioned (maybe method name not correct, last arg determines). Let me change the order.
| return allServers; | ||
| } | ||
| List<ServerName> decommissionedRegionServers = listDecommissionedRegionServers(); | ||
| if (CollectionUtils.isNotEmpty(decommissionedRegionServers)) { |
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if (CollectionUtils.isNotEmpty(decommissionedRegionServers)) {
allServers = new ArrayList<>(allServers);
allServers.removeIf(decommissionedRegionServers::contains);
return Collections.unmodifiableList(allServers);
}
return allServers;
to
return allServers.stream()
.filter(s -> !decommissionedRegionServers.contains(s))
.collect(ImmutableList.toImmutableList());
I think this will save one time full copy (previous code copy twice, and this copies just once). Need to confirm.
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The reason behind copy (new ArrayList<>(allServers)) was making allServers unmodifiable list. So ImmutableList.toImmutableList() seems to be solving our problem.
Apache-HBase
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Apr 16, 2020
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Apache-HBase
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Apache-HBase
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HorizonNet
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Apr 16, 2020
virajjasani added a commit
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Apr 16, 2020
#1523) Signed-off-by: Mingliang Liu <liuml07@apache.org> Signed-off-by: Jan Hentschel <jan.hentschel@ultratendency.com>
virajjasani added a commit
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#1523) Signed-off-by: Mingliang Liu <liuml07@apache.org> Signed-off-by: Jan Hentschel <jan.hentschel@ultratendency.com>
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Apr 20, 2020
apache#1523) Signed-off-by: Mingliang Liu <liuml07@apache.org> Signed-off-by: Jan Hentschel <jan.hentschel@ultratendency.com>
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…luding decom RS optionally