Hi Om,
Although you solved this issue by bumping up the ipc max length which is
by default set to 64MB.
$ hdfs getconf -confkey ipc.maximum.data.length
67108864
So, it means the disk you are using is having more then 1 million
blocks. Are you using HDFS block size to be very small ?
If you are keeping the HDFS block size to 64MB, you can a disk of size
64TB before you start seeing this error. Looks like you are doing
something wrong.
Having a large value of ipc max will increase the serialization and
de-serialization time for protobuf.
On 20/7/17 7:01 pm, omprakash wrote:
Hi,
Thanks for the quick reply.
That was exactly the problem. The datanodes were throwing error of
“maximum IPC message lengthsize not enough” but we were focusing on
NameNodes only.
I changed the “/ipc.maximum.data.length” /property in core-site.xml
file(I found this solution of above error after searcing over
internet) and restarted the namenode and datanode. After an hour all
the blocks get loaded successfully.
Thanks for the help again.
Regards
Om
*From:*surendra lilhore [mailto:surendra.lilh...@huawei.com]
*Sent:* 20 July 2017 12:12
*To:* omprakash <ompraka...@cdac.in>; user@hadoop.apache.org
*Subject:* RE: Namenode not able to come out of SAFEMODE
Hi Omprakash,
The reported blocks 0 needs additional 6132675 blocks to reach the
threshold 0.9990 of total blocks 6138814. The number of *live
datanodes 0* has reached the minimum number 0.
-----------> By seeing this message looks like NameNode loaded the
block info into memory but the reported blocks from the Datanodes are
"0". Maybe datanodes are not running, if it is running then please
check why it’s not registered with namenode. You can check the
datanode log for more details.
Regards,
Surendra
------------------------------------------------------------------------
*From:*omprakash [ompraka...@cdac.in]
*Sent:* Thursday, July 20, 2017 12:12 AM
*To:* user@hadoop.apache.org <mailto:user@hadoop.apache.org>
*Subject:* Namenode not able to come out of SAFEMODE
Hi all,
I have a setup of 3 node Hadoop cluster(Hadoop-2.8.0). I have deployed
2 namenodes that are configured in HA mode using QJM. 2 datanodes are
configured on the same machine where namenode are installed. 3^rd node
is used for quorum purpose only.
*Setup*
*Node1 -> nn1, dn1, jn1, zkfc1, zkServer1*
*Node2 -> nn2, dn2, jn2, zkfc2, zkServer2*
*Node3 -> jn3, zkServer3*
I stopped the cluster for some reason(power recycled the servers) and
since them I am not able to start the cluster successfully. After
examining the logs I found that the namenodes are in safe mode and
none of them are able to load the block in memory. Below is the status
of namenode from namenode UI.
Safe mode is ON. The reported blocks 0 needs additional 6132675 blocks
to reach the threshold 0.9990 of total blocks 6138814. The number of
live datanodes 0 has reached the minimum number 0. Safe mode will be
turned off automatically once the thresholds have been reached.
61,56,984 files and directories, 61,38,814 blocks = 1,22,95,798 total
filesystem object(s).
Heap Memory used 5.6 GB of 7.12 GB Heap Memory. Max Heap Memory is
13.33 GB.
Non Heap Memory used 45.19 MB of 49.75 MB Commited Non Heap Memory.
Max Non Heap Memory is 130 MB.
I have tried increasing the HADOOP_HEAPSIZE, increasing the heap size
in HADOOP_NAMENODE_OPTS but no success.
Need help.
*Regards*
*Omprakash Paliwal*
HPC-Medical and Bioinformatics Applications Group
Centre for Development of Advanced Computing (C-DAC)
Pune University campus,
PUNE-411007
Maharashtra, India
email:_omprakashp@cdac.in_
Contact : +91-20-25704231
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