[jira] [Updated] (HDFS-7097) Allow block reports to be processed during checkpointing on standby name node
[
https://issues.apache.org/jira/browse/HDFS-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Harsh J updated HDFS-7097:
--
Target Version/s: (was: 2.6.0)
Allow block reports to be processed during checkpointing on standby name node
-
Key: HDFS-7097
URL: https://issues.apache.org/jira/browse/HDFS-7097
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Assignee: Kihwal Lee
Priority: Critical
Fix For: 2.7.0
Attachments: HDFS-7097.patch, HDFS-7097.patch, HDFS-7097.patch,
HDFS-7097.patch, HDFS-7097.ultimate.trunk.patch
On a reasonably busy HDFS cluster, there are stream of creates, causing data
nodes to generate incremental block reports. When a standby name node is
checkpointing, RPC handler threads trying to process a full or incremental
block report is blocked on the name system's {{fsLock}}, because the
checkpointer acquires the read lock on it. This can create a serious problem
if the size of name space is big and checkpointing takes a long time.
All available RPC handlers can be tied up very quickly. If you have 100
handlers, it only takes 34 file creates. If a separate service RPC port is
not used, HA transition will have to wait in the call queue for minutes. Even
if a separate service RPC port is configured, hearbeats from datanodes will
be blocked. A standby NN with a big name space can lose all data nodes after
checkpointing. The rpc calls will also be retransmitted by data nodes many
times, filling up the call queue and potentially causing listen queue
overflow.
Since block reports are not modifying any state that is being saved to
fsimage, I propose letting them through during checkpointing.
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[jira] [Updated] (HDFS-7097) Allow block reports to be processed during checkpointing on standby name node
[
https://issues.apache.org/jira/browse/HDFS-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Akira AJISAKA updated HDFS-7097:
Resolution: Fixed
Fix Version/s: 2.7.0
Status: Resolved (was: Patch Available)
Allow block reports to be processed during checkpointing on standby name node
-
Key: HDFS-7097
URL: https://issues.apache.org/jira/browse/HDFS-7097
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Assignee: Kihwal Lee
Priority: Critical
Fix For: 2.7.0
Attachments: HDFS-7097.patch, HDFS-7097.patch, HDFS-7097.patch,
HDFS-7097.patch, HDFS-7097.ultimate.trunk.patch
On a reasonably busy HDFS cluster, there are stream of creates, causing data
nodes to generate incremental block reports. When a standby name node is
checkpointing, RPC handler threads trying to process a full or incremental
block report is blocked on the name system's {{fsLock}}, because the
checkpointer acquires the read lock on it. This can create a serious problem
if the size of name space is big and checkpointing takes a long time.
All available RPC handlers can be tied up very quickly. If you have 100
handlers, it only takes 34 file creates. If a separate service RPC port is
not used, HA transition will have to wait in the call queue for minutes. Even
if a separate service RPC port is configured, hearbeats from datanodes will
be blocked. A standby NN with a big name space can lose all data nodes after
checkpointing. The rpc calls will also be retransmitted by data nodes many
times, filling up the call queue and potentially causing listen queue
overflow.
Since block reports are not modifying any state that is being saved to
fsimage, I propose letting them through during checkpointing.
--
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(v6.3.4#6332)
[jira] [Updated] (HDFS-7097) Allow block reports to be processed during checkpointing on standby name node
[
https://issues.apache.org/jira/browse/HDFS-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kihwal Lee updated HDFS-7097:
-
Attachment: HDFS-7097.ultimate.trunk.patch
Here is the updated patch.
Allow block reports to be processed during checkpointing on standby name node
-
Key: HDFS-7097
URL: https://issues.apache.org/jira/browse/HDFS-7097
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Assignee: Kihwal Lee
Priority: Critical
Attachments: HDFS-7097.patch, HDFS-7097.patch, HDFS-7097.patch,
HDFS-7097.patch, HDFS-7097.ultimate.trunk.patch
On a reasonably busy HDFS cluster, there are stream of creates, causing data
nodes to generate incremental block reports. When a standby name node is
checkpointing, RPC handler threads trying to process a full or incremental
block report is blocked on the name system's {{fsLock}}, because the
checkpointer acquires the read lock on it. This can create a serious problem
if the size of name space is big and checkpointing takes a long time.
All available RPC handlers can be tied up very quickly. If you have 100
handlers, it only takes 34 file creates. If a separate service RPC port is
not used, HA transition will have to wait in the call queue for minutes. Even
if a separate service RPC port is configured, hearbeats from datanodes will
be blocked. A standby NN with a big name space can lose all data nodes after
checkpointing. The rpc calls will also be retransmitted by data nodes many
times, filling up the call queue and potentially causing listen queue
overflow.
Since block reports are not modifying any state that is being saved to
fsimage, I propose letting them through during checkpointing.
--
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(v6.3.4#6332)
[jira] [Updated] (HDFS-7097) Allow block reports to be processed during checkpointing on standby name node
[
https://issues.apache.org/jira/browse/HDFS-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kihwal Lee updated HDFS-7097:
-
Attachment: HDFS-7097.patch
Attaching a new patch with the lock name/comment changes.
Allow block reports to be processed during checkpointing on standby name node
-
Key: HDFS-7097
URL: https://issues.apache.org/jira/browse/HDFS-7097
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Assignee: Kihwal Lee
Priority: Critical
Attachments: HDFS-7097.patch, HDFS-7097.patch, HDFS-7097.patch,
HDFS-7097.patch
On a reasonably busy HDFS cluster, there are stream of creates, causing data
nodes to generate incremental block reports. When a standby name node is
checkpointing, RPC handler threads trying to process a full or incremental
block report is blocked on the name system's {{fsLock}}, because the
checkpointer acquires the read lock on it. This can create a serious problem
if the size of name space is big and checkpointing takes a long time.
All available RPC handlers can be tied up very quickly. If you have 100
handlers, it only takes 34 file creates. If a separate service RPC port is
not used, HA transition will have to wait in the call queue for minutes. Even
if a separate service RPC port is configured, hearbeats from datanodes will
be blocked. A standby NN with a big name space can lose all data nodes after
checkpointing. The rpc calls will also be retransmitted by data nodes many
times, filling up the call queue and potentially causing listen queue
overflow.
Since block reports are not modifying any state that is being saved to
fsimage, I propose letting them through during checkpointing.
--
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(v6.3.4#6332)
[jira] [Updated] (HDFS-7097) Allow block reports to be processed during checkpointing on standby name node
[
https://issues.apache.org/jira/browse/HDFS-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kihwal Lee updated HDFS-7097:
-
Attachment: HDFS-7097.patch
Made the change in the test case. It now checks the result every 100ms for up
to 5 seconds.
Allow block reports to be processed during checkpointing on standby name node
-
Key: HDFS-7097
URL: https://issues.apache.org/jira/browse/HDFS-7097
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Assignee: Kihwal Lee
Priority: Critical
Attachments: HDFS-7097.patch, HDFS-7097.patch, HDFS-7097.patch
On a reasonably busy HDFS cluster, there are stream of creates, causing data
nodes to generate incremental block reports. When a standby name node is
checkpointing, RPC handler threads trying to process a full or incremental
block report is blocked on the name system's {{fsLock}}, because the
checkpointer acquires the read lock on it. This can create a serious problem
if the size of name space is big and checkpointing takes a long time.
All available RPC handlers can be tied up very quickly. If you have 100
handlers, it only takes 34 file creates. If a separate service RPC port is
not used, HA transition will have to wait in the call queue for minutes. Even
if a separate service RPC port is configured, hearbeats from datanodes will
be blocked. A standby NN with a big name space can lose all data nodes after
checkpointing. The rpc calls will also be retransmitted by data nodes many
times, filling up the call queue and potentially causing listen queue
overflow.
Since block reports are not modifying any state that is being saved to
fsimage, I propose letting them through during checkpointing.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
[jira] [Updated] (HDFS-7097) Allow block reports to be processed during checkpointing on standby name node
[
https://issues.apache.org/jira/browse/HDFS-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kihwal Lee updated HDFS-7097:
-
Attachment: HDFS-7097.patch
Modified a test case to also check whether block reports are processed during
checkpointing on standby nn.
Allow block reports to be processed during checkpointing on standby name node
-
Key: HDFS-7097
URL: https://issues.apache.org/jira/browse/HDFS-7097
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Assignee: Kihwal Lee
Priority: Critical
Attachments: HDFS-7097.patch, HDFS-7097.patch
On a reasonably busy HDFS cluster, there are stream of creates, causing data
nodes to generate incremental block reports. When a standby name node is
checkpointing, RPC handler threads trying to process a full or incremental
block report is blocked on the name system's {{fsLock}}, because the
checkpointer acquires the read lock on it. This can create a serious problem
if the size of name space is big and checkpointing takes a long time.
All available RPC handlers can be tied up very quickly. If you have 100
handlers, it only takes 34 file creates. If a separate service RPC port is
not used, HA transition will have to wait in the call queue for minutes. Even
if a separate service RPC port is configured, hearbeats from datanodes will
be blocked. A standby NN with a big name space can lose all data nodes after
checkpointing. The rpc calls will also be retransmitted by data nodes many
times, filling up the call queue and potentially causing listen queue
overflow.
Since block reports are not modifying any state that is being saved to
fsimage, I propose letting them through during checkpointing.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
[jira] [Updated] (HDFS-7097) Allow block reports to be processed during checkpointing on standby name node
[
https://issues.apache.org/jira/browse/HDFS-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kihwal Lee updated HDFS-7097:
-
Attachment: HDFS-7097.patch
Allow block reports to be processed during checkpointing on standby name node
-
Key: HDFS-7097
URL: https://issues.apache.org/jira/browse/HDFS-7097
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Priority: Critical
Attachments: HDFS-7097.patch
On a reasonably busy HDFS cluster, there are stream of creates, causing data
nodes to generate incremental block reports. When a standby name node is
checkpointing, RPC handler threads trying to process a full or incremental
block report is blocked on the name system's {{fsLock}}, because the
checkpointer acquires the read lock on it. This can create a serious problem
if the size of name space is big and checkpointing takes a long time.
All available RPC handlers can be tied up very quickly. If you have 100
handlers, it only takes 34 file creates. If a separate service RPC port is
not used, HA transition will have to wait in the call queue for minutes. Even
if a separate service RPC port is configured, hearbeats from datanodes will
be blocked. A standby NN with a big name space can lose all data nodes after
checkpointing. The rpc calls will also be retransmitted by data nodes many
times, filling up the call queue and potentially causing listen queue
overflow.
Since block reports are not modifying any state that is being saved to
fsimage, I propose letting them through during checkpointing.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
[jira] [Updated] (HDFS-7097) Allow block reports to be processed during checkpointing on standby name node
[
https://issues.apache.org/jira/browse/HDFS-7097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kihwal Lee updated HDFS-7097:
-
Status: Patch Available (was: Open)
Allow block reports to be processed during checkpointing on standby name node
-
Key: HDFS-7097
URL: https://issues.apache.org/jira/browse/HDFS-7097
Project: Hadoop HDFS
Issue Type: Bug
Reporter: Kihwal Lee
Priority: Critical
Attachments: HDFS-7097.patch
On a reasonably busy HDFS cluster, there are stream of creates, causing data
nodes to generate incremental block reports. When a standby name node is
checkpointing, RPC handler threads trying to process a full or incremental
block report is blocked on the name system's {{fsLock}}, because the
checkpointer acquires the read lock on it. This can create a serious problem
if the size of name space is big and checkpointing takes a long time.
All available RPC handlers can be tied up very quickly. If you have 100
handlers, it only takes 34 file creates. If a separate service RPC port is
not used, HA transition will have to wait in the call queue for minutes. Even
if a separate service RPC port is configured, hearbeats from datanodes will
be blocked. A standby NN with a big name space can lose all data nodes after
checkpointing. The rpc calls will also be retransmitted by data nodes many
times, filling up the call queue and potentially causing listen queue
overflow.
Since block reports are not modifying any state that is being saved to
fsimage, I propose letting them through during checkpointing.
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